Had I seen this thread earlier... I would probably have responded that
no, AFAIR it is not safe to reboot while reshaping (!)
In fact i seem to recall that there was a very serious known problem
during pivot_root , which is at the end of initramfs. A reshape in
progress through that point would cause data loss. So the array could
only be assembled after that point, so you had to modify initrd or use a
livecd so to be sure that it wouldn't find/assemble the array at the
early stages of boot. This is what I seem to remember.
However by looking for details on such problem everywhere, I am not
anymore able to find any reference.
Does anybody recall this problem?
Thanks
J.
On 08/01/2014 12:19, Piotr Klimek wrote:
Hi,
Everything works fine right now, all I have to do after reboot was
assemble array using backup file and set MDADM_GROW_ALLOW_OLD=1
enviroment variable.
Thanks for your help.
2014/1/3 Phil Turmel <philip@xxxxxxxxxx>:
It is supposed to be safe. With a clean shutdown, the superblock will
have a record of the reshape progress and will be able to continue after
re-assembly.
But you'll probably have to assembly manually to specify the location of
the critical section backup file. If your root FS is in this array,
you'll have to intervene in the initramfs.
HTH,
Phil
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