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-Subject: ANNOUNCE: mdadm 3.3 - A tools for managing md Soft RAID under Linux
-
-I am pleased to announce the availability of
- mdadm version 3.3
-
-It is available at the usual places:
- http://www.kernel.org/pub/linux/utils/raid/mdadm/
-and via git at
- git://github.com/neilbrown/mdadm
- git://neil.brown.name/mdadm
- http://git.neil.brown.name/git/mdadm
-
-This is a major new release so don't be too surprised if there are a
-few issues. If I hear about them they will be fixed in 3.3.1.
-git log reports nearly 500 changes since 3.2.6 so I won't list them
-all.
-
-Some highlights are:
-
-- Some array reshapes can proceed without needing backup file.
- This is done by changing the 'data_offset' so we never need to write
- any data back over where it was before. If there is no "head space"
- or "tail space" to allow data_offset to change, the old mechanism
- with a backup file can still be used.
-- RAID10 arrays can be reshaped to change the number of devices,
- change the chunk size, or change the layout between 'near'
- and 'offset'.
- This will always change data_offset, and will fail if there is no
- room for data_offset to be moved.
-- "--assemble --update=metadata" can convert a 0.90 array to a 1.0 array.
-- bad-block-logs are supported (but not heavily tested yet)
-- "--assemble --update=revert-reshape" can be used to undo a reshape
- that has just been started but isn't really wanted. This is very
- new and while it passes basic tests it cannot be guaranteed.
-- improved locking between --incremental and --assemble
-- uses systemd to run "mdmon" if systemd is configured to do that.
-- kernel names of md devices can be non-numeric. e.g. "md_home" rather than
- "md0". This will probably confuse lots of other tools, so you need to
- echo CREATE names=yes >> /etc/mdadm.conf
- or the feature will not be used. (you also need a reasonably new kernel).
-- "--stop" can be given a kernel name instead of a device name. i.e
- mdadm --stop md4
- will work even if /dev/md4 doesn't exist.
-- "--detail --export" has some information about the devices in the array
-- --dump and --restore can be used to backup and restore the metadata on an
- array.
-- Hot-replace is supported with
- mdadm /dev/mdX --replace /dev/foo
- and
- mdadm /dev/mdX --replace /dev/foo --with /dev/bar
-- Config file can be a directory in which case all "*.conf" files are
- read in lexical order.
- Default is to read /etc/mdadm.conf and then /etc/mdadm.conf.d
- Thus
- echo CREATE name=yes > /etc/mdadm.conf.d/names.conf
- will also enable the use of named md devices.
-
-- Lots of improvements to DDF support including adding support for
- RAID10 (thanks Martin Wilck).
-
-and lots of bugfixes and other little changes.
-
-NeilBrown 3rd September 2013