Re: RAID6 reshape integer problem

On 01/03/2014 08:34 AM, Piotr Klimek wrote:

2014/1/3 Phil Turmel [off-list ref]

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After couple of days reshape stalled on 2147483648 block. I have found

that

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this is a bug in mdadm. 2147483648 is max integer on 32 bit system. For

now

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situation looks like this:

You'll certainly have to take production down long enough to let a newer
kernel finish the reshape.  Or you could be brave and replace the kernel
and let production continue through the balance of the reshape.

Is it safe to reboot during reshape and boot up with new kernel? I can
easly upgrade kernel to 3.2.0.

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