diff options
Diffstat (limited to 'TODO')
| -rw-r--r-- | TODO | 213 |
1 files changed, 213 insertions, 0 deletions
@@ -0,0 +1,213 @@ + - add 'name' field to metadata type and use it. + - use validate_geometry more + - metadata should be able to check/reject bitmap stuff. + +DDF: + Three new metadata types: + ddf - used only to create a container. + ddf-bvd - used to create an array in a container + ddf-svd - used to create a secondary array from bvds. + + Usage: + mdadm -C /dev/ddf1 /dev/sd[abcdef] + mdadm -C /dev/md1 -e ddf /dev/sd[a-f] + mdadm -C /dev/md1 -l container /dev/sd[a-f] + + Each of these create a new ddf container using all those + devices. The name 'ddf*' signals that ddf metadata should be used. + '-e ddf' only supports one level - 'container'. 'container' is only + supported by ddf. + + mdadm -C /dev/md1 -l0 -n4 /dev/ddf1 # or maybe not ??? + mdadm -C /dev/md1 -l1 -n2 /dev/sda /dev/sdb + If exactly one device is given, and it is a container, we select + devices from that container. + If devices are given that are already in use, they must be in use by + a container, and the array is created in the container. + If devices given are bvds, we slip under the hood to make + the svd arrays. + + mdadm -A /dev/ddf ...... + base drives make a container. Anything in that container is started + auto-read-only. + if /dev/ddf is already assembled, we assemble bvds and svds inside it. + + +2005-dec-20 + Want an incremental assembly mode to work nicely with udev. + Core usage would be something like + mdadm --incr-assemble /dev/newdevice + This would + - examine the device to determine uuid etc. + - look for a match in /etc/mdadm.conf, abort if not found + - find that device and collect current contents + - perform an 'assemble' analysis to make sure we have the best set of devices. + - remove or add devices as appropriate + - possibly start the array if it was complete + + Other usages could involve + - specify which array to auto-add to. + This requires an existing array for uuid matching... is there any point? + + - + + +2004-june-02 + * Don't print 'errors' flag, it is meaningless. DONE + * Handle new superblock format + * create device file on demand, particularly partitionable devices. DONE + BUT figure a way to create the partition devices. + auto=partN + * Use Event: interface to listen for events. DONE, untested + * Make sure mdadm -As can assemble multi-level RAIDs ok. + * --build to build raid1 or multipath arrays + clean or not ??? + +---------------------------------------------------------------------------- +* mdadm --monitor to monitor failed multipath paths and re-instate them. + +* Maybe make "--help" fit in 80x24 and have a --long-help with more info. DONE + + +* maybe "missing" instead of <bold>missing</> in doco DONE +* possibly wait for resync to start, or even finish while assembling.- NO + +* -Db should have a devices= entry if possible. - DONE +* when assembling multipath arrays, ignore any error indicators. - DONE +* rationalise --monitor usage: + mdadm --monitor + doesn't do as expected. DONE + +* --assemble could have a --update option. - DONE + following word can be: + sparc2.2 + super-minor + +* mdadm /dev/md11, where md11 is raid0 can segfault, particularly when looking in the + [UU_UUU] string ... which doesn't exist ! +It should be more sensible. DONE + +Example: + +from Raimund Sacherer <raimund.sacherer@ngit.at> + +mke2fs -m0 -q /dev/ram1 300 +mount -n -t ext2 /dev/ram1 /tmp +echo DEVICE /dev/[sh]* >> /tmp/mdadm.conf +mdadm -Esb /dev/[sh]* 2>/dev/null >> /tmp/mdadm.conf +mdadm -ARsc /tmp/mdadm.conf +umount /tmp + + +?? Allow -S /dev/md? - current complains subsequent not a/d/r - DONE + +* new "Query" mode to subsume --detail and --examine. + --query or -Q, takes a device and tells if it is an MD device, + and also tells in a raid superblock is found. + DONE + +* write mdstat.c to parse /proc/mdstat file + Build list of arrays: name, rebuild-percent + DONE + +* parse /proc/partitions and map major/minor into /dev/* names, + and use that for default DEVICE list ???? + +* --detail --scan to read /proc/mdstat, and then iterate over these, + but assume --brief. --verbose can override + check each subdevice to see if it is in conf_get_devs. + Warn if not. + DONE, but don't warn yet... + +* Support multipath ... maybe... + maybe DONE + +* --follow to syslog + +* --follow to move spares around DONE + +* --follow to notice other events: DONE + rebuild started + spare activated + spare removed + spare added + +------------------------------------ +- --examine --scan scans all drives and build an mdadm.conf file DONE + +- check superblock checksum in examine DONE +- report "chunk" or "rounding" depending on raid level DONE +- report "linear" instead of "-1" for raid level DONE +- decode ayout depending on raid level DONE +- --verbose and --force flags. DONE + +- set md_minor, *_disks for Create - DONE +- for create raid5, how to choose between + all working, but not insync + one missing, one spare, insync DONE (--force) +- and for raid1 - some failed drives... (missing) + +- when RUN_ARRAY, make sure *_disks counts are right + +- get --detail to extract extra stuff from superblock, + like uuid DONE +- --detail --brief to give a config file line DONE +- parse config file. DONE +- test... + +- when --assemble --scan, if an underlying device is an md device, + then try to assemble that device first. + + +- mdadm -S /dev/md0 /dev/md1 gives internal error FIXED + +- mdadm --detail --scan print summary of what it can find? DONE + + +--------- +Assemble doesn't add spares. - DONE +Create to allow "missing" name for devices. +Create to accept "--force" for do exactly what is requested +- get Assemble to upgrade devices if force flag. +ARRAY lines in config file to have super_minor=n +ARRAY lines in config file to have device=pattern, and only accept + those devices + If UUID given, insist on that + If not, but super_minor given, require all found with that minor + to have same uuid + If only device given, all valid supers on those devices must have + same uuid +allow /dev/mdX as first argument before any options +Possible --dry-run option for create and assemble--force + +Assemble to check that all devices mentioned in superblock + are present. + +New mode: --Monitor (or --Follow) + Periodically check status of all arrays (listed in config file). + Log every event and apparent cause - or differences + Email and alert - or run a program - for important events + Move spares around if necessary. + + An Array line can have a spare-group= field that indicates that + the array shares spares with other arrays with the same + spare-group name. + If an array has a failed and no spares, then check all other + arrays in the spare group. If one has no failures and a spare, + then consider that spare. + Choose the smallest considered spare that is large enough. + If there is one, then hot-remove it from it's home, and + hot-add it to the array in question. + + --mail-to address + --alert-handler program + + Will also extract information from /proc/mdstat if present, + and consider 20% marks in rebuild as events. + + Events are: + drive fails - causes mail to be sent + rebuild started + spare activated + spare removed + spare added |