Re: [PATCH 00/22] IMSM checkpointing implementation

[NeilBrown <neilb@suse.de>]

On Thu, 02 Jun 2011 16:48:08 +0200 Krzysztof Wojcik
<krzysztof.wojcik@intel.com> wrote:

> IMSM for securing reshape process uses special disk area outside metadata
> for reshaped area backup purposes. If just reshaped array area requires
> backup, bunch of array stripes prepared for reshape is stored in to
> Migration Copy Area. In case of reshape interruption, Option ROM during
> restart or mdadm during reshape restart (when no reboot occurs) will
> restore Migration Copy Area to designation array.
> Reshape can be continued form stable array stable state.
> 
> The following series implements IMSM checkpointing procedure.

I have applied most of these patches - some with some minor fixes.  The major
changes I have already mentioned.

I will wait for you responses to those changes, and the other bug fixes you
mentioned before considering a release of 3.2.2, but I would like to make
that release in the next week or two.

Thanks,
NeilBrown

> 
> ---
> 
> Adam Kwolek, Krzysztof Wojcik (22):
>       imsm: Add migration record to intel_super
>       Support restore_stripes() from the given buffer
>       Define dummy functions to mdmon.c
>       imsm: Add support for copy area and backup operations
>       imsm: check migration compatibility
>       FIX: Initialize reshape structure
>       imsm: Add wait_for_reshape_imsm() implementation
>       imsm: Implement imsm_manage_reshape(), reshape workhorse
>       imsm: Check if array degradation has been changed
>       imsm: Clear migration record when no migration in progress
>       imsm: Add information about migration record to mdadm '-E' option
>       imsm: update blocks_per_migr_unit() to support migration record
>       Add reshape restart support for external metadata
>       imsm: Implement recover_backup_imsm() for imsm metadata
>       imsm: Disable checkpoint updating by mdmon for general migration
>       imsm: Add metadata update type for general migration check-pointing
>       imsm: Prepare checkpoint update for general migration
>       imsm: Apply checkpoint metadata update for general migration
>       FIX: Enable metadata updates for raid0
>       Do not use backup file for external metadata
>       imsm: Remove user warning before reshape start
>       imsm: Unit Tests - remove backup-file during grow command
> 
> 
>  Assemble.c               |   10 
>  Grow.c                   |   50 +-
>  mdadm.h                  |    7 
>  mdmon.c                  |   23 +
>  restripe.c               |  101 +++-
>  super-intel.c            | 1241 ++++++++++++++++++++++++++++++++++++++++++++--
>  tests/imsm-grow-template |    5 
>  7 files changed, 1322 insertions(+), 115 deletions(-)
>