Thanks for the response Drew. I am testing the stability of MD driver with new ADMA driver using AMCC PowerPC cores. When I tried to grow during recovery the following error is showed up.
----
-bash-3.2# mdadm -G /dev/md0 -n 4
mdadm: Need to backup 384K of critical section..
md: couldn't update array info. -16
mdadm: Cannot set device size/shape for /dev/md0: Device or resource busy
-bash-3.2# cat /proc/mdstat
Personalities : [raid0] [raid6] [raid5] [raid4]
md0 : active raid5 sdd[3](S) sdc[2] sdb[1] sda[0]
60000000 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
[=>...................] resync = 6.9% (2094848/30000000) finish=11.1min speed=41674K/sec
unused devices: <none>
-bash-3.2#
---
Regards,
Marri
-----Original Message-----
From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of Drew
Sent: Friday, July 24, 2009 6:03 AM
To: linux-raid@xxxxxxxxxxxxxxx
Subject: Re: Question on RAID-5 growing
> Is it legal to grow while RAID-5 recovery Is happening ?
>
>
> 1. mdadm -C /dev/md0 -z 1000000 -l 5 -n 3 /dev/sd[a-c]
> 2. mdadm -a /dev/md0 /dev/sdd
> 3. mdadm -G /dev/md- -n 4
Hi Marri,
One, If this is a live system I'm thinking it's safer to let the
recovery complete and then add the extra disk (after backing up the
data of course). Two, if this array isn't live yet (no data, lvm,
filesystem, etc yet) it'd probably be easier to halt the existing
RAID-5, and create the new array from scratch.
That said I'm sure Neil will chime in and correct me. :-)
--
Drew
"Nothing in life is to be feared. It is only to be understood."
--Marie Curie
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