Re: 20 drive raid-10, CentOS5.5, after reboot assemble fails - all drives "non-fresh"
From: Jeff Johnson <hidden>
Date: 2011-08-08 05:55:21
Joe / et-al, The '--assemble --update=uuid' appears to have done the trick. It is weird because the uuid in the config file matched the uuid of the raid volume shown with 'mdadm -D /dev/md3' and the uuid on each of the drives shown with 'mdadm -E /dev/sdc1' The '--update=summaries' did not work. Assigning a new random uuid appears to have repaired whatever bit in the superblock was mucked up. Strange... Joe, thanks for your help. Find me at SC11, I'm buying you beers. --Jeff On 8/7/11 10:04 PM, Joe Landman wrote:
quoted
Maybe '--update=uuid' ??It looks like it correctly finds /dev/sd[c-z]1 as elements of /dev/md3 Which mdadm are you using? mdadm -V and which kernel? Try the UUID update, and let us know if it helps. Also if your mdadm is old (2.6.x), try updating to 3.1.x. FWIW: we've found problems in the past with Centos 5.4 to 5.5 kernels with MD arrays. Often times our only real solution would be to update the full OS on the boot drives. This is for distro specific kernels. For our kernels, we don't run into this issue.
-- ------------------------------ Jeff Johnson Manager Aeon Computing jeff.johnson "at" aeoncomputing.com www.aeoncomputing.com t: 858-412-3810 x101 f: 858-412-3845 4905 Morena Boulevard, Suite 1313 - San Diego, CA 92117