Date: Sun, 20 Sep 2009 16:00:10 -0600 From: Kurt Touet <ktouet@gmail.com> To: freebsd-fs@freebsd.org Subject: ZFS - Unable to offline drive in raidz1 based pool Message-ID: <2a5e326f0909201500w1513aeb5ra644f1c748e22f34@mail.gmail.com>
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I am using ZFS pool based on a 4-drive raidz1 setup for storage. I
believe that one of the drives is failing, and I'd like to
remove/replace it. The drive has been causing some issues (such as
becoming non-responsive and hanging the system with timeouts), so I'd
like to offline it, and then run in degraded mode until I can grab a
new drive (tomorrow). However, when I disconnected the drive (pulled
the plug, not using a zpool offline command), the following occurred:
NAME STATE READ WRITE CKSUM
storage FAULTED 0 0 1
raidz1 DEGRADED 0 0 0
ad14 ONLINE 0 0 0
ad6 UNAVAIL 0 0 0
ad12 ONLINE 0 0 0
ad4 ONLINE 0 0 0
Note: That's my recreation of the output... not the actual text.
At this point, I was unable to to do anything with the pool... and all
data was inaccessible. Fortunately, the after sitting pulled for a
bit, I tried putting the failing drive back into the array, and it
booted properly. Of course, I still want to replace it, but this is
what happens when I try to take it offline:
monolith# zpool status storage
pool: storage
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
storage ONLINE 0 0 0
raidz1 ONLINE 0 0 0
ad14 ONLINE 0 0 0
ad6 ONLINE 0 0 0
ad12 ONLINE 0 0 0
ad4 ONLINE 0 0 0
errors: No known data errors
monolith# zpool offline storage ad6
cannot offline ad6: no valid replicas
monolith# uname -a
FreeBSD monolith 8.0-RC1 FreeBSD 8.0-RC1 #2 r197370: Sun Sep 20
15:32:08 CST 2009 k@monolith:/usr/obj/usr/src/sys/MONOLITH amd64
If the array is online and healthy, why can't I simply offline a drive
and then replace it afterwards? Any thoughts? Also, how does a
degraded raidz1 array end up faulting the entire pool?
Thanks,
-kurt
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