* Re: [Board] dead RAID6 array on CentOS6.6 / kernel 3.19
[not found] <b8upe28pe441l7y4sd2vv61c.1423623489558@email.android.com>
@ 2015-02-11 3:37 ` Adam Thompson
0 siblings, 0 replies; only message in thread
From: Adam Thompson @ 2015-02-11 3:37 UTC (permalink / raw)
To: Trevor Cordes; +Cc: linux-raid
On 2015-02-10 08:58 PM, Trevor Cordes wrote:
> The big first question is was it lying when it said starting bg recon.
> Probably. How can it rebuild a 3+ drive failure.
>
> If so it should be possible to really force. As in wild wacky stuff.
> I've done that before.
>
> I can look at it more after the meeting our tomorrow morning.
>
> Was the reboot a clean or a sysreq? Did it sync first?
Manually initiated by reboot(8), which is a link to telinit(8), which
merely sends a signal to init(8), which actually did the reboot.
No idea if /dev/md127 correctly stopped or not, syslogd stops before
those messages get logged, and I was working remotely through SSH
instead of to the virtual console connection.
I would assume the sync(2) happened correctly; this is breakage way down
at the MD layer, not the FS layer.
You're right, RAID6 can't rebuild from a 3-drive failure. I've gone
back through the messages I sent, and it looks like there was no
hot-spare, so I suspect this is just the default code path, where it
tries to rebuild anything it can, then figures out it can't.
--
-Adam Thompson
athompso@athompso.net
+1 (204) 291-7950 - cell
+1 (204) 489-6515 - fax
^ permalink raw reply [flat|nested] only message in thread