Re: can't add a larger spare for a failed smaller disk

[Wols Lists <antlists@youngman.org.uk>]

On 25/06/17 19:32, Hubert Reevez wrote:
> All seems to went good, but data offset are not equal on sdc and sdg,
> should I grow ? or something else ? thanks again
> 
That's normal on an array to which "things have happened".

If you grow or shrink or do other things which need to move data around,
the operation moves the data to a new offset to avoid having to have a
backup file.

And it does this on a per-disk basis, so if you if you change the raid
type, or you add a disk, or you do whole bunch of assorted operations,
the data could end up shuffled back and forth all over the place.

Bottom line - it's expected behaviour, don't worry.

Have you read the raid wiki? I get the impression you're not that au
fait with how raid works - a little bit of study might not go amiss :-)
> 
> md0 : active raid6 sdf[0] sdg[6] sdb[4] sde[3] sda[2] sdc[7]
> 5860548608 blocks super 1.2 level 6, 512k chunk, algorithm 2 [6/6] [UUUUUU]
> 
> 
> mdadm -E : https://pastebin.com/hs7F5Ppi

Cheers,
Wol