diff options
Diffstat (limited to 'docs-xml/smbdotconf/tuning')
25 files changed, 642 insertions, 0 deletions
diff --git a/docs-xml/smbdotconf/tuning/aiomaxthreads.xml b/docs-xml/smbdotconf/tuning/aiomaxthreads.xml new file mode 100644 index 0000000..3afe989 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/aiomaxthreads.xml @@ -0,0 +1,19 @@ +<samba:parameter name="aio max threads" + type="integer" + context="G" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para> + The integer parameter specifies the maximum number of + threads each smbd process will create when doing parallel asynchronous IO + calls. If the number of outstanding calls is greater than this + number the requests will not be refused but go onto a queue + and will be scheduled in turn as outstanding requests complete. + </para> + + <related>aio read size</related> + <related>aio write size</related> +</description> + +<value type="default">100</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/aioreadsize.xml b/docs-xml/smbdotconf/tuning/aioreadsize.xml new file mode 100644 index 0000000..5218f34 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/aioreadsize.xml @@ -0,0 +1,18 @@ +<samba:parameter name="aio read size" + context="S" + type="bytes" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>If this integer parameter is set to a non-zero value, + Samba will read from files asynchronously when the request size is bigger + than this value. Note that it happens only for non-chained and non-chaining + reads.</para> + <para>The only reasonable values for this parameter are 0 (no async I/O) and + 1 (always do async I/O).</para> + <related>aio write size</related> +</description> + +<value type="default">1</value> +<value type="example">0<comment>Always do reads synchronously + </comment></value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/aiowritebehind.xml b/docs-xml/smbdotconf/tuning/aiowritebehind.xml new file mode 100644 index 0000000..d60af71 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/aiowritebehind.xml @@ -0,0 +1,24 @@ +<samba:parameter name="aio write behind" + context="S" + type="string" + substitution="1" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>If Samba has been built with asynchronous I/O support, + Samba will not wait until write requests are finished before returning + the result to the client for files listed in this parameter. + Instead, Samba will immediately return that the write + request has been finished successfully, no matter if the + operation will succeed or not. This might speed up clients without + aio support, but is really dangerous, because data could be lost + and files could be damaged. + </para> + <para> + The syntax is identical to the <smbconfoption name="veto files"/> + parameter. + </para> +</description> + +<value type="default"/> +<value type="example">/*.tmp/</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/aiowritesize.xml b/docs-xml/smbdotconf/tuning/aiowritesize.xml new file mode 100644 index 0000000..029e1d1 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/aiowritesize.xml @@ -0,0 +1,23 @@ +<samba:parameter name="aio write size" + context="S" + type="bytes" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>If this integer parameter is set to a non-zero value, + Samba will write to files asynchronously when the request size is bigger + than this value. Note that it happens only for non-chained and non-chaining + writes.</para> + <para>The only reasonable values for this parameter are 0 (no async I/O) and + 1 (always do async I/O).</para> + <para>Compared to <smbconfoption name="aio read size"/> this parameter has + a smaller effect, most writes should end up in the + file system cache. Writes that require space allocation might + benefit most from going asynchronous.</para> + + <related>aio read size</related> +</description> + +<value type="default">1</value> +<value type="example">0<comment>Always do writes synchronously + </comment></value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/allocationroundupsize.xml b/docs-xml/smbdotconf/tuning/allocationroundupsize.xml new file mode 100644 index 0000000..08aa621 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/allocationroundupsize.xml @@ -0,0 +1,28 @@ +<samba:parameter name="allocation roundup size" + context="S" + type="bytes" + deprecated="1" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>This parameter allows an administrator to tune the + allocation size reported to Windows clients. This is only + useful for old SMB1 clients because modern SMB dialects + eliminated that bottleneck and have better performance by + default. Using this parameter may cause + difficulties for some applications, e.g. MS Visual Studio. + If the MS Visual Studio compiler starts to crash with an + internal error, set this parameter to zero for this share. + Settings this parameter to a large value can also cause + small files to allocate more space on the disk than + needed. + </para> + <para>This parameter is deprecated and will be removed in + one of the next Samba releases. + </para> + + <para>The integer parameter specifies the roundup size in bytes.</para> +</description> + +<value type="default">0</value> +<value type="example">1048576<comment>(to set it to the former default of 1 MiB)</comment></value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/asyncdnstimeout.xml b/docs-xml/smbdotconf/tuning/asyncdnstimeout.xml new file mode 100644 index 0000000..522ef20 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/asyncdnstimeout.xml @@ -0,0 +1,20 @@ +<samba:parameter name="async dns timeout" + context="G" + type="integer" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>The number of seconds the asynchronous DNS + resolver code in Samba will wait for responses. + Some of the Samba client library code uses internal + asynchronous DNS resolution for A and AAAA records + when trying to find Active Directory Domain controllers. + This value prevents this name resolution code from + waiting for DNS server timeouts. + </para> + <para>The minimum value of this parameter is clamped + at 1 second.</para> +</description> + +<value type="default">10</value> +<value type="example">20</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/blocksize.xml b/docs-xml/smbdotconf/tuning/blocksize.xml new file mode 100644 index 0000000..8d0dd8c --- /dev/null +++ b/docs-xml/smbdotconf/tuning/blocksize.xml @@ -0,0 +1,27 @@ +<samba:parameter name="block size" + type="bytes" + context="S" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>This parameter controls the behavior of <citerefentry><refentrytitle>smbd</refentrytitle> + <manvolnum>8</manvolnum></citerefentry> when reporting disk free + sizes. By default, this reports a disk block size of 1024 bytes. + </para> + + <para>Changing this parameter may have some effect on the + efficiency of client writes, this is not yet confirmed. This + parameter was added to allow advanced administrators to change + it (usually to a higher value) and test the effect it has on + client write performance without re-compiling the code. As this + is an experimental option it may be removed in a future release. + </para> + + <para>Changing this option does not change the disk free reporting + size, just the block size unit reported to the client. + </para> +</description> + +<value type="default">1024</value> +<value type="example">4096</value> + +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/checkparentdirectorydeleteonclose.xml b/docs-xml/smbdotconf/tuning/checkparentdirectorydeleteonclose.xml new file mode 100644 index 0000000..1de0609 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/checkparentdirectorydeleteonclose.xml @@ -0,0 +1,13 @@ +<samba:parameter name="check parent directory delete on close" + context="S" + type="boolean" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>A Windows SMB server prevents the client from creating files in a + directory that has the delete-on-close flag set. By default Samba doesn't + perform this check as this check is a quite expensive operation in Samba. + </para> +</description> + +<value type="default">no</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/deadtime.xml b/docs-xml/smbdotconf/tuning/deadtime.xml new file mode 100644 index 0000000..77e0e5f --- /dev/null +++ b/docs-xml/smbdotconf/tuning/deadtime.xml @@ -0,0 +1,27 @@ +<samba:parameter name="deadtime" + context="G" + type="integer" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>The value of the parameter (a decimal integer) + represents the number of minutes of inactivity before a connection + is considered dead, and it is disconnected. The deadtime only takes + effect if the number of open files is zero.</para> + + <para>This is useful to stop a server's resources being + exhausted by a large number of inactive connections.</para> + + <para>Most clients have an auto-reconnect feature when a + connection is broken so in most cases this parameter should be + transparent to users.</para> + + <para>Using this parameter with a timeout of a few minutes + is recommended for most systems.</para> + + <para>A deadtime of zero indicates that no auto-disconnection + should be performed.</para> +</description> + +<value type="default">10080</value> +<value type="example">15</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/getwdcache.xml b/docs-xml/smbdotconf/tuning/getwdcache.xml new file mode 100644 index 0000000..ec4d9ed --- /dev/null +++ b/docs-xml/smbdotconf/tuning/getwdcache.xml @@ -0,0 +1,13 @@ +<samba:parameter name="getwd cache" + context="G" + type="boolean" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>This is a tuning option. When this is enabled a + caching algorithm will be used to reduce the time taken for getwd() + calls. This can have a significant impact on performance, especially + when the <smbconfoption name="wide links"/> parameter is set to <constant>no</constant>.</para> +</description> + +<value type="default">yes</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/hostnamelookups.xml b/docs-xml/smbdotconf/tuning/hostnamelookups.xml new file mode 100644 index 0000000..03678e9 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/hostnamelookups.xml @@ -0,0 +1,15 @@ +<samba:parameter name="hostname lookups" + context="G" + type="boolean" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>Specifies whether samba should use (expensive) + hostname lookups or use the ip addresses instead. An example place + where hostname lookups are currently used is when checking + the <command moreinfo="none">hosts deny</command> and <command moreinfo="none">hosts allow</command>. + </para> +</description> + +<value type="default">no</value> +<value type="example">yes</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/keepalive.xml b/docs-xml/smbdotconf/tuning/keepalive.xml new file mode 100644 index 0000000..7fbe8cc --- /dev/null +++ b/docs-xml/smbdotconf/tuning/keepalive.xml @@ -0,0 +1,22 @@ +<samba:parameter name="keepalive" + context="G" + type="integer" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>The value of the parameter (an integer) represents + the number of seconds between <parameter moreinfo="none">keepalive</parameter> + packets. If this parameter is zero, no keepalive packets will be + sent. Keepalive packets, if sent, allow the server to tell whether + a client is still present and responding.</para> + + <para>Keepalives should, in general, not be needed if the socket + has the SO_KEEPALIVE attribute set on it by default. (see <smbconfoption name="socket options"/>). +Basically you should only use this option if you strike difficulties.</para> + + <para>Please note this option only applies to SMB1 client connections, and + has no effect on SMB2 clients.</para> +</description> + +<value type="default">300</value> +<value type="example">600</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/maxconnections.xml b/docs-xml/smbdotconf/tuning/maxconnections.xml new file mode 100644 index 0000000..1e3043b --- /dev/null +++ b/docs-xml/smbdotconf/tuning/maxconnections.xml @@ -0,0 +1,17 @@ +<samba:parameter name="max connections" + context="S" + type="integer" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>This option allows the number of simultaneous connections to a service to be limited. + If <parameter moreinfo="none">max connections</parameter> is greater than 0 then connections + will be refused if this number of connections to the service are already open. A value + of zero mean an unlimited number of connections may be made.</para> + + <para>Record lock files are used to implement this feature. The lock files will be stored in + the directory specified by the <smbconfoption name="lock directory"/> option.</para> +</description> + +<value type="default">0</value> +<value type="example">10</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/maxdisksize.xml b/docs-xml/smbdotconf/tuning/maxdisksize.xml new file mode 100644 index 0000000..0361358 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/maxdisksize.xml @@ -0,0 +1,27 @@ +<samba:parameter name="max disk size" + context="G" + type="bytes" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>This option allows you to put an upper limit + on the apparent size of disks. If you set this option to 100 + then all shares will appear to be not larger than 100 MB in + size.</para> + + <para>Note that this option does not limit the amount of + data you can put on the disk. In the above case you could still + store much more than 100 MB on the disk, but if a client ever asks + for the amount of free disk space or the total disk size then the + result will be bounded by the amount specified in <parameter moreinfo="none">max + disk size</parameter>.</para> + + <para>This option is primarily useful to work around bugs + in some pieces of software that can't handle very large disks, + particularly disks over 1GB in size.</para> + + <para>A <parameter moreinfo="none">max disk size</parameter> of 0 means no limit.</para> +</description> + +<value type="default">0</value> +<value type="example">1000</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/maxopenfiles.xml b/docs-xml/smbdotconf/tuning/maxopenfiles.xml new file mode 100644 index 0000000..f873ef7 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/maxopenfiles.xml @@ -0,0 +1,22 @@ +<samba:parameter name="max open files" + type="integer" + context="G" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>This parameter limits the maximum number of + open files that one <citerefentry><refentrytitle>smbd</refentrytitle> + <manvolnum>8</manvolnum></citerefentry> file + serving process may have open for a client at any one time. + This parameter can be set very high (16384) as Samba uses + only one bit per unopened file. Setting this parameter lower than + 16384 will cause Samba to complain and set this value back to + the minimum of 16384, as Windows 7 depends on this number of + open file handles being available.</para> + + <para>The limit of the number of open files is usually set + by the UNIX per-process file descriptor limit rather than + this parameter so you should never need to touch this parameter.</para> +</description> + +<value type="default">16384</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/maxsmbdprocesses.xml b/docs-xml/smbdotconf/tuning/maxsmbdprocesses.xml new file mode 100644 index 0000000..f5b1e42 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/maxsmbdprocesses.xml @@ -0,0 +1,24 @@ +<samba:parameter name="max smbd processes" + type="integer" + context="G" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>This parameter limits the maximum number of <citerefentry><refentrytitle>smbd</refentrytitle> + <manvolnum>8</manvolnum></citerefentry> processes concurrently running on a system and is intended + as a stopgap to prevent degrading service to clients in the event that the server has insufficient + resources to handle more than this number of connections. Remember that under normal operating + conditions, each user will have an <citerefentry><refentrytitle>smbd</refentrytitle> + <manvolnum>8</manvolnum></citerefentry> associated with him or her to handle connections to all + shares from a given host.</para> + + <para>For a Samba ADDC running the standard process model this option + limits the number of processes forked to handle requests. + Currently new processes are only forked for ldap and netlogon + requests. + </para> + +</description> + +<value type="default">0</value> +<value type="example">1000</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/minprintspace.xml b/docs-xml/smbdotconf/tuning/minprintspace.xml new file mode 100644 index 0000000..b5bba27 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/minprintspace.xml @@ -0,0 +1,15 @@ +<samba:parameter name="min print space" + context="S" + type="integer" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>This sets the minimum amount of free disk + space that must be available before a user will be able to spool + a print job. It is specified in kilobytes. The default is 0, which + means a user can always spool a print job.</para> +</description> + +<related>printing</related> +<value type="default">0</value> +<value type="example">2000</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/namecachetimeout.xml b/docs-xml/smbdotconf/tuning/namecachetimeout.xml new file mode 100644 index 0000000..4d29194 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/namecachetimeout.xml @@ -0,0 +1,14 @@ +<samba:parameter name="name cache timeout" + context="G" + type="integer" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>Specifies the number of seconds it takes before + entries in samba's hostname resolve cache time out. If + the timeout is set to 0. the caching is disabled. +</para> +</description> + +<value type="default">660</value> +<value type="example">0</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/socketoptions.xml b/docs-xml/smbdotconf/tuning/socketoptions.xml new file mode 100644 index 0000000..d2be514 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/socketoptions.xml @@ -0,0 +1,104 @@ +<samba:parameter name="socket options" + context="G" + type="string" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para> + <warning> + <para>Modern server operating systems are tuned for high + network performance in the majority of situations; when you set socket + options you are overriding those settings. Linux in particular has an + auto-tuning mechanism for buffer sizes that will be disabled if you + specify a socket buffer size. This can potentially cripple your + TCP/IP stack.</para> + + <para> Getting the socket options correct can make a big difference to + your performance, but getting them wrong can degrade it by just as + much. As with any other low level setting, if you must make changes + to it, make small changes and <emphasis>test</emphasis> the effect + before making any large changes.</para> + </warning> + </para> + + <para>This option allows you to set socket options + to be used when talking with the client.</para> + + <para>Socket options are controls on the networking layer + of the operating systems which allow the connection to be + tuned.</para> + + <para>This option will typically be used to tune your Samba server + for optimal performance for your local network. There is no way + that Samba can know what the optimal parameters are for your net, + so you must experiment and choose them yourself. We strongly + suggest you read the appropriate documentation for your operating + system first (perhaps <command moreinfo="none">man + setsockopt</command> will help).</para> + + <para>You may find that on some systems Samba will say + "Unknown socket option" when you supply an option. This means you + either incorrectly typed it or you need to add an include file + to includes.h for your OS. If the latter is the case please + send the patch to <ulink url="mailto:samba-technical@lists.samba.org"> + samba-technical@lists.samba.org</ulink>.</para> + + <para>Any of the supported socket options may be combined + in any way you like, as long as your OS allows it.</para> + + <para>This is the list of socket options currently settable + using this option:</para> + + <itemizedlist> + <listitem><para>SO_KEEPALIVE</para></listitem> + <listitem><para>SO_REUSEADDR</para></listitem> + <listitem><para>SO_BROADCAST</para></listitem> + <listitem><para>TCP_NODELAY</para></listitem> + <listitem><para>TCP_KEEPCNT *</para></listitem> + <listitem><para>TCP_KEEPIDLE *</para></listitem> + <listitem><para>TCP_KEEPINTVL *</para></listitem> + <listitem><para>IPTOS_LOWDELAY</para></listitem> + <listitem><para>IPTOS_THROUGHPUT</para></listitem> + <listitem><para>SO_REUSEPORT</para></listitem> + <listitem><para>SO_SNDBUF *</para></listitem> + <listitem><para>SO_RCVBUF *</para></listitem> + <listitem><para>SO_SNDLOWAT *</para></listitem> + <listitem><para>SO_RCVLOWAT *</para></listitem> + <listitem><para>SO_SNDTIMEO *</para></listitem> + <listitem><para>SO_RCVTIMEO *</para></listitem> + <listitem><para>TCP_FASTACK *</para></listitem> + <listitem><para>TCP_QUICKACK</para></listitem> + <listitem><para>TCP_NODELAYACK</para></listitem> + <listitem><para>TCP_KEEPALIVE_THRESHOLD *</para></listitem> + <listitem><para>TCP_KEEPALIVE_ABORT_THRESHOLD *</para></listitem> + <listitem><para>TCP_DEFER_ACCEPT *</para></listitem> + <listitem><para>TCP_USER_TIMEOUT *</para></listitem> + </itemizedlist> + + <para>Those marked with a <emphasis>'*'</emphasis> take an integer + argument. The others can optionally take a 1 or 0 argument to enable + or disable the option, by default they will be enabled if you + don't specify 1 or 0.</para> + + <para>To specify an argument use the syntax SOME_OPTION = VALUE + for example <command moreinfo="none">SO_SNDBUF = 8192</command>. Note that you must + not have any spaces before or after the = sign.</para> + + <para>If you are on a local network then a sensible option + might be:</para> + + <para><command moreinfo="none">socket options = IPTOS_LOWDELAY</command></para> + + <para>If you have a local network then you could try:</para> + + <para><command moreinfo="none">socket options = IPTOS_LOWDELAY TCP_NODELAY</command></para> + + <para>If you are on a wide area network then perhaps try + setting IPTOS_THROUGHPUT. </para> + + <para>Note that several of the options may cause your Samba + server to fail completely. Use these options with caution!</para> +</description> + +<value type="default">TCP_NODELAY</value> +<value type="example">IPTOS_LOWDELAY</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/strictallocate.xml b/docs-xml/smbdotconf/tuning/strictallocate.xml new file mode 100644 index 0000000..bd867da --- /dev/null +++ b/docs-xml/smbdotconf/tuning/strictallocate.xml @@ -0,0 +1,40 @@ +<samba:parameter name="strict allocate" + context="S" + type="boolean" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>This is a boolean that controls the handling of + disk space allocation in the server. When this is set to <constant>yes</constant> + the server will change from UNIX behaviour of not committing real + disk storage blocks when a file is extended to the Windows behaviour + of actually forcing the disk system to allocate real storage blocks + when a file is created or extended to be a given size. In UNIX + terminology this means that Samba will stop creating sparse files.</para> + + <para>This option is really designed for file systems that support + fast allocation of large numbers of blocks such as extent-based file systems. + On file systems that don't support extents (most notably ext3) this can + make Samba slower. When you work with large files over >100MB on file + systems without extents you may even run into problems with clients + running into timeouts.</para> + + <para>When you have an extent based filesystem it's likely that we can make + use of unwritten extents which allows Samba to allocate even large amounts + of space very fast and you will not see any timeout problems caused by + strict allocate. With strict allocate in use you will also get much better + out of quota messages in case you use quotas. Another advantage of + activating this setting is that it will help to reduce file + fragmentation.</para> + + <para>To give you an idea on which filesystems this setting might currently + be a good option for you: XFS, ext4, btrfs, ocfs2 on Linux and JFS2 on + AIX support unwritten extents. On Filesystems that do not support it, + preallocation is probably an expensive operation where you will see reduced + performance and risk to let clients run into timeouts when creating large + files. Examples are ext3, ZFS, HFS+ and most others, so be aware if you + activate this setting on those filesystems.</para> + +</description> + +<value type="default">no</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/strictrename.xml b/docs-xml/smbdotconf/tuning/strictrename.xml new file mode 100644 index 0000000..91572f2 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/strictrename.xml @@ -0,0 +1,34 @@ +<samba:parameter name="strict rename" + context="S" + type="boolean" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>By default a Windows SMB server prevents directory + renames when there are open file or directory handles below + it in the filesystem hierarchy. Historically Samba has always + allowed this as POSIX filesystem semantics require it.</para> + + <para>This boolean parameter allows Samba to match the Windows + behavior. Setting this to "yes" is a very expensive change, + as it forces Samba to travers the entire open file handle + database on every directory rename request. In a clustered + Samba system the cost is even greater than the non-clustered + case.</para> + + <para>When set to "no" smbd only checks the local process + the client is attached to for open files below a directory + being renamed, instead of checking for open files across all + smbd processes.</para> + + <para>Because of the expense in fully searching the database, + the default is "no", and it is recommended to be left that way + unless a specific Windows application requires it to be changed.</para> + + <para>If the client has requested UNIX extensions (POSIX + pathnames) then renames are always allowed and this parameter + has no effect.</para> + +</description> + +<value type="default">no</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/strictsync.xml b/docs-xml/smbdotconf/tuning/strictsync.xml new file mode 100644 index 0000000..f2e3788 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/strictsync.xml @@ -0,0 +1,40 @@ +<samba:parameter name="strict sync" + context="S" + type="boolean" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> + <description> + <para>This parameter controls whether Samba honors a request + from an SMB client to ensure any outstanding operating system + buffer contents held in memory are safely written onto stable + storage on disk. If set to <constant>yes</constant>, which is + the default, then Windows applications can force the smbd server + to synchronize unwritten data onto the disk. If set to + <constant>no</constant> then smbd will ignore client + requests to synchronize unwritten data onto stable storage on + disk.</para> + + <para>In Samba 4.7.0, the default for this parameter changed from + <constant>no</constant> to <constant>yes</constant> to better + match the expectations of SMB2/3 clients and improve application + safety when running against smbd.</para> + + <para>The flush request from SMB2/3 clients is handled + asynchronously inside smbd, so leaving the parameter as the default + value of <constant>yes</constant> does not block the processing of + other requests to the smbd process.</para> + + <para>Legacy Windows applications (such as the Windows 98 explorer + shell) seemed to confuse writing buffer contents to the operating + system with synchronously writing outstanding data onto stable storage + on disk. Changing this parameter to <constant>no</constant> means that + <citerefentry><refentrytitle>smbd</refentrytitle> + <manvolnum>8</manvolnum></citerefentry> will ignore the Windows + applications request to synchronize unwritten data onto disk. Only + consider changing this if smbd is serving obsolete SMB1 Windows clients + prior to Windows XP (Windows 98 and below). There should be no need to + change this setting for normal operations.</para> +</description> + +<related>sync always</related> +<value type="default">yes</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/syncalways.xml b/docs-xml/smbdotconf/tuning/syncalways.xml new file mode 100644 index 0000000..9a095d5 --- /dev/null +++ b/docs-xml/smbdotconf/tuning/syncalways.xml @@ -0,0 +1,21 @@ +<samba:parameter name="sync always" + context="S" + type="boolean" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>This is a boolean parameter that controls + whether writes will always be written to stable storage before + the write call returns. If this is <constant>no</constant> then the server will be + guided by the client's request in each write call (clients can + set a bit indicating that a particular write should be synchronous). + If this is <constant>yes</constant> then every write will be followed by a <command moreinfo="none">fsync() + </command> call to ensure the data is written to disk. Note that + the <parameter moreinfo="none">strict sync</parameter> parameter must be set to + <constant>yes</constant> in order for this parameter to have + any effect.</para> +</description> + +<related>strict sync</related> + +<value type="default">no</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/usemmap.xml b/docs-xml/smbdotconf/tuning/usemmap.xml new file mode 100644 index 0000000..cbc18be --- /dev/null +++ b/docs-xml/smbdotconf/tuning/usemmap.xml @@ -0,0 +1,17 @@ +<samba:parameter name="use mmap" + context="G" + type="boolean" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>This global parameter determines if the tdb internals of Samba can + depend on mmap working correctly on the running system. Samba requires a coherent + mmap/read-write system memory cache. Currently only OpenBSD and HPUX do not have such a + coherent cache, and on those platforms this parameter is overridden internally + to be effectively <constant>no</constant>. On all systems this parameter should be left alone. This + parameter is provided to help the Samba developers track down problems with + the tdb internal code. + </para> +</description> + +<value type="default">yes</value> +</samba:parameter> diff --git a/docs-xml/smbdotconf/tuning/usesendfile.xml b/docs-xml/smbdotconf/tuning/usesendfile.xml new file mode 100644 index 0000000..46255cd --- /dev/null +++ b/docs-xml/smbdotconf/tuning/usesendfile.xml @@ -0,0 +1,18 @@ +<samba:parameter name="use sendfile" + context="S" + type="boolean" + function="_use_sendfile" + xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> +<description> + <para>If this parameter is <constant>yes</constant>, and the <constant>sendfile()</constant> + system call is supported by the underlying operating system, then some SMB read calls + (mainly ReadAndX and ReadRaw) will use the more efficient sendfile system call for files that + are exclusively oplocked. This may make more efficient use of the system CPU's + and cause Samba to be faster. Samba automatically turns this off for clients + that use protocol levels lower than NT LM 0.12 and when it detects a client is + Windows 9x (using sendfile from Linux will cause these clients to fail). + </para> +</description> + +<value type="default">no</value> +</samba:parameter> |