On Sat, May 30, 2009 at 5:53 PM, Neil Brown <neilb@xxxxxxx> wrote: >> However, after a reboot, I'm back to 3 active and 0 spare drives. [snip] > > This should "just work". There might be some hints in > /var/log/messages if you'd like to post that. Here is the output of `cat /var/log/messages | grep raid`: http://pastebin.ca/1441575 It seems that raid5 only sees the sd[acd] as active drives, but doesn't pick up the spare. >> -- Is there any way to instantiate a superblock on /dev/sdb1 so that >> it can be associated with this array's UUID? > > You have already done that. Use > mdadm --examine /dev/sdb > to confirm. This successfully identifies /dev/sdb1 as a spare: http://pastebin.ca/1441576 However running `mdadm --examine /dev/sda` for example does not: http://pastebin.ca/1441578 And running `mdadm --detail /dev/md0` also says no spares: http://pastebin.ca/1441579 (let me know if you'd rather I paste these inline, for archival purposes or what have you) >> -- I have the ARRAY line (in mdadm.conf) specified by UUID; could this >> be causing the spare to be excluded, since it (presumably) does not >> have a superblock? > > No. And it does have a superblock. Gotcha, I stand corrected! I guess at this point I just need to figure out how to get the spare to recognize on bootup, since it's already got the same UUID and is listed in mdadm.conf: http://pastebin.ca/1441588 Thanks again for your help, Dave -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
