Release mdadm-3.0-rc1
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NeilBrown
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Subject: ANNOUNCE: mdadm 3.0-rc1 - A tool for managing Soft RAID under Linux
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I am pleased to announce the availability of
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mdadm version 3.0-rc1
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It is available at the usual places:
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countrycode=xx.
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http://www.${countrycode}kernel.org/pub/linux/utils/raid/mdadm/
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and via git at
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git://neil.brown.name/mdadm
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http://neil.brown.name/git?p=mdadm
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This is a "release candidate" which means that I think it is safe
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to use and that there will be no significant change in functionality
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before release.
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The man pages aren't really "release candidate" yet but I will be
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working on them before the final release.
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The most significant changes since -devel3 relate to the names of md
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devices as they appear in /dev and /dev/md/, and in particular the names
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that are used when an array is assembled with "--incremental" or with
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"mdadm --assemble --scan" when there are no ARRAY lines in mdadm.conf.
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In these cases mdadm needs to deduce a name to use, and to try to
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avoid using a name that a different array might have a stronger claim to.
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The rules are:
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- if the array is mentioned in mdadm.conf, use the name given there.
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- if the array appear to have been created for "this host" using the
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"homehost" concept, trust the name given in the metadata
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- if the new setting "HOMEHOST <ignore>" is given (can be in mdadm.conf
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or on command line) the the name given in the metadata is not
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associated with some other array by mdadm.conf, then trust the
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name given in the metadata
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- otherwise use the name in the metadata, but in an untrusted manner.
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If a name is untrusted, or if the name is already in use by another
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array, then a numeric suffix like "_0", "_1" is appended to create
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a unique name for the array.
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That name is then used to create a device file in /dev/md/.
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So if all arrays needed for boot will always be listed in
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/etc/mdadm.conf, then it is appropriate to add "HOMEHOST <ignore>" to
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mdadm.conf and there is no risk of conflicting names. However if you
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want auto-assemble to assemble all arrays at boot time and you don't
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want to list them in mdadm.conf, then don't give "HOMEHOST <ignore>"
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either else there could be a risk of the wrong array being assembled
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for a given name.
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The following is the same introduction to 3.x as appeared in
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previous announcements.
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Any testing and feedback will be greatly appreciated.
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NeilBrown 11th May 2009
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=====================================================
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The significant change which justifies the new major version number is
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that mdadm can now handle metadata updates entirely in userspace.
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This allows mdadm to support metadata formats that the kernel knows
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nothing about.
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Currently two such metadata formats are supported:
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- DDF - The SNIA standard format
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- Intel Matrix - The metadata used by recent Intel ICH controlers.
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Also the approach to device names has changed significantly.
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If udev is installed on the system, mdadm will not create any devices
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in /dev. Rather it allows udev to manage those devices. For this to work
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as expected, the included udev rules file should be installed.
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If udev is not install, mdadm will still create devices and symlinks
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as required, and will also remove them when the array is stopped.
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mdadm now requires all devices which do not have a standard name (mdX
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or md_dX) to live in the directory /dev/md/. Names in this directory
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will always be created as symlinks back to the standard name in /dev.
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The man pages contain some information about the new externally managed
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metadata. However see below for a more condensed overview.
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Externally managed metadata introduces the concept of a 'container'.
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A container is a collection of (normally) physical devices which have
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a common set of metadata. A container is assembled as an md array, but
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is left 'inactive'.
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A container can contain one or more data arrays. These are composed from
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slices (partitions?) of various devices in the container.
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For example, a 5 devices DDF set can container a RAID1 using the first
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half of two devices, a RAID0 using the first half of the remain 3 devices,
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and a RAID5 over thte second half of all 5 devices.
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A container can be created with
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mdadm --create /dev/md0 -e ddf -n5 /dev/sd[abcde]
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or "-e imsm" to use the Intel Matrix Storage Manager.
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An array can be created within a container either by giving the
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container name and the only member:
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mdadm -C /dev/md1 --level raid1 -n 2 /dev/md0
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or by listing the component devices
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mdadm -C /dev/md2 --level raid0 -n 3 /dev/sd[cde]
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To assemble a container, it is easiest just to pass each device in turn to
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mdadm -I
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for i in /dev/sd[abcde]
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do mdadm -I $i
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done
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This will assemble the container and the components.
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Alternately the container can be assembled explicitly
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mdadm -A /dev/md0 /dev/sd[abcde]
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Then the components can all be assembled with
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mdadm -I /dev/md0
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For each container, mdadm will start a program called "mdmon" which will
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monitor the array and effect any metadata updates needed. The array is
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initially assembled readonly. It is up to "mdmon" to mark the metadata
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as 'dirty' and which the array to 'read-write'.
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The version 0.90 and 1.x metadata formats supported by previous
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versions for mdadm are still supported and the kernel still performs
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the same updates it use to. The new 'mdmon' approach is only used for
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newly introduced metadata types.
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2
ReadMe.c
2
ReadMe.c
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@ -24,7 +24,7 @@
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#include "mdadm.h"
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char Version[] = Name " - v3.0-devel3 - 10th March 2009\n";
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char Version[] = Name " - v3.0-rc1 - 11th May 2009\n";
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/*
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* File: ReadMe.c
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@ -27,6 +27,7 @@ ANNOUNCE-2.6.9
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ANNOUNCE-3.0-devel1
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ANNOUNCE-3.0-devel2
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ANNOUNCE-3.0-devel3
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ANNOUNCE-3.0-rc1
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Assemble.c
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bitmap.c
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bitmap.h
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@ -112,6 +113,8 @@ tests/00raid5
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tests/00raid6
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tests/01r1fail
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tests/01r5fail
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tests/01r5integ
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tests/01raid6integ
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tests/02lineargrow
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tests/02r1add
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tests/02r1grow
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@ -147,6 +150,7 @@ tests/07reshape5intr
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tests/07testreshape5
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tests/08imsm-overlap
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tests/09imsm-create-fail-rebuild
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tests/10ddf-create
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tests/check
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tests/env-08imsm-overlap
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tests/env-09imsm-create-fail-rebuild
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2
mdadm.8
2
mdadm.8
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.\" the Free Software Foundation; either version 2 of the License, or
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.\" (at your option) any later version.
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.\" See file COPYING in distribution for details.
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.TH MDADM 8 "" v3.0-devel3
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.TH MDADM 8 "" v3.0-rc1
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.SH NAME
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mdadm \- manage MD devices
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.I aka
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@ -1,6 +1,6 @@
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Summary: mdadm is used for controlling Linux md devices (aka RAID arrays)
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Name: mdadm
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Version: 3.0_devel3
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Version: 3.0_rc1
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Release: 1
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Source: http://www.kernel.org/pub/linux/utils/raid/mdadm/mdadm-%{version}.tgz
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URL: http://neil.brown.name/blog/mdadm
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.\" -*- nroff -*-
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.TH MDASSEMBLE 8 "" v3.0-devel3
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.TH MDASSEMBLE 8 "" v3.0-rc1
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.SH NAME
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mdassemble \- assemble MD devices
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.I aka
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