>Number: 148655
>Category: misc
>Synopsis: [zfs] Booting from a degraded raidz no longer works in
>8-STABLE [regression]
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Jul 15 23:00:04 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator: Emil Smolenski
>Release: FreeBSD 8-STABLE
>Organization:
>Environment:
FreeBSD 8.0-STABLE i386
>Description:
After upgrade 8.0-RELEASE system to 8-STABLE, the machine no longer boots from
degraded raidz. Booting stops with a message:
error 1 lba 32
error 1 lba 1
Booting from a non-degraded raidz still works fine.
After encountering a problem I prepared an isolated (qemu) environment to test
this issue.
In 8.0-RELEASE everything works fine. I can remove one disk and the system
boots. My configuration:
- gpart config:
=> 34 6291389 ad0 GPT (3.0G)
34 128 1 freebsd-boot (64K)
162 6291261 2 freebsd-zfs (3.0G)
=> 34 6291389 ad1 GPT (3.0G)
34 128 1 freebsd-boot (64K)
162 6291261 2 freebsd-zfs (3.0G)
=> 34 6291389 ad3 GPT (3.0G)
34 128 1 freebsd-boot (64K)
162 6291261 2 freebsd-zfs (3.0G)
(with GPT labeling)
- zpool (v13) config:
NAME STATE READ WRITE CKSUM
bijou ONLINE 0 0 0
raidz1 ONLINE 0 0 0
gpt/bijou0 ONLINE 0 0 0
gpt/bijou1 ONLINE 0 0 0
gpt/bijou2 ONLINE 0 0 0
- loader.conf:
zfs_load="YES"
vfs.root.mountfrom="zfs:bijou"
- rc.conf:
zfs_enable="YES"
After upgrade to 8-STABLE (world and kernel) and BEFORE reinstalling bootcode
booting from degraded raidz no longer works:
http://img28.imageshack.us/img28/9118/raidz8stable.png . Note: the installworld
upgrades /boot/loader.
After reinstalling bootcode:
gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 ad0
gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 ad1
gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 ad3
booting stops with a message:
error 1 lba 32
error 1 lba 1
( http://img17.imageshack.us/img17/36/raidz8stablereinstalled.png )
Upgrading zpool to v14 doesn't help. I think this is serious regression --
disks often fail during reboot. The whole idea of raidz doesn't make any sense.
>How-To-Repeat:
1. Have FreeBSD 8.0-RELEASE "RootOnZFS" raidz1 installation (like the one
described here: http://wiki.freebsd.org/RootOnZFS/GPTZFSBoot/RAIDZ1 )
2. Upgrade to 8-STABLE.
3. Physically remove one disk from raidz.
4. Boot the machine.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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