Re: Growing a raid 6 array

[Laurent CARON <lcaron@unix-scripts.info>]

Neil Brown a écrit :
> On Thursday March 1, jpiszcz@lucidpixels.com wrote:
>> You can only grow a RAID5 array in Linux as of 2.6.20 AFAIK.
> 
> There are two dimensions for growth.
> You can increase the amount of each device that is used, or you can
> increase the number of devices.
> 
> You are correct that increasing the number of devices only works for
> RAID5 (and RAID1, but you don't get extra space) in 2.6.20 (RAID6
> coming in 2.6.21).
> 
> However this question is about growing an array the first way:
> increasing the amount of space used on each devices, and that is
> supported for RAID1/4/5/6.
> 
> And Laurent:
>   1/ Yes, it is that easy
>   2/ I doubt a nearly-full ext3 array increases the risk
>   3/ The effect of adding a bitmap is that if you suffer a crash while
>      the array is degraded, it will resync faster so you have less
>      exposure to multiple failure.

I just finished changing disks, growing the array, and then the filesystem.

It worked flawlessy.

Just a little notice: I had to unmount my ext3 filesystem to be able to
resize it. (Took ~8 hours to fsck + resize the 15 disks array from 6 to
9TB on a dual Xeon with 4GB RAM).

Thanks

Laurent
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