Date: Thu, 26 Nov 2009 07:18:01 GMT From: Alexei Volkov <Alexei.Volkov@softlynx.ru> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/140888: boot fail from zfs root while the pool resilvering Message-ID: <200911260718.nAQ7I1nd002420@www.freebsd.org> Resent-Message-ID: <200911260720.nAQ7K1DR032919@freefall.freebsd.org>
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>Number: 140888 >Category: kern >Synopsis: boot fail from zfs root while the pool resilvering >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Thu Nov 26 07:20:01 UTC 2009 >Closed-Date: >Last-Modified: >Originator: Alexei Volkov >Release: 8.0-RELEASE >Organization: SoftLynx >Environment: FreeBSD livecd8 8.0-RELEASE FreeBSD 8.0-RELEASE #0: Tue Nov 24 08:29:59 UTC 2009 root@80AMD64:/usr/obj/usr/src/sys/GENERIC amd64 >Description: On the system boots directly from ZFS mirror or raidz pool (http://wiki.freebsd.org/RootOnZFS) replacing one of the components with subsequent accident power failure or reboot while the resilvering is running, stops boot process with the message: ZFS: can only boot from disk, mirror or raidz vdevs ZFS: inconsistent nvlist contents ZFS: i/o error - all block copies unavailable ZFS: can't read MOS ZFS: unexpected object set type lld ZFS: unexpected object set type lld FreeBSD/i386 boot Default: tank0:/boot/kernel/kernel boot: ZFS: unexpected object set type lld FreeBSD/i386 boot Default: tank0:/boot/kernel/kernel boot: >How-To-Repeat: Install the system as described on http://wiki.freebsd.org/RootOnZFS for non single device installation i.e. mirror, raidz. Eventually has something like [root@fresh-inst:~]# zpool status pool: tank0 state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM tank0 ONLINE 0 0 0 raidz1 ONLINE 0 0 0 gpt/QM00002 ONLINE 0 0 0 gpt/SN091234 ONLINE 0 0 0 errors: No known data errors Lets assume that one of the component has a prefail condition and have to be replaced with new one. Power off the system and replace one of the HDD with onother one. Boot back to OS. Booting just fine for now. Get zpool status to see missing component. [root@fresh-inst:~]# zpool status pool: tank0 state: DEGRADED status: One or more devices could not be opened. Sufficient replicas exist for the pool to continue functioning in a degraded state. action: Attach the missing device and online it using 'zpool online'. see: http://www.sun.com/msg/ZFS-8000-2Q scrub: none requested config: NAME STATE READ WRITE CKSUM tank0 DEGRADED 0 0 0 raidz1 DEGRADED 0 0 0 gpt/QM00002 UNAVAIL 0 327 0 cannot open gpt/SN091234 ONLINE 0 0 0 errors: No known data errors Partition the new disk as required and get new gpt component ready for zpool replacement. [root@fresh-inst:~]# gpart show -l => 34 8388541 ad0 GPT (4.0G) 34 128 1 (null) (64K) 162 8388413 2 SN091234 (4.0G) => 34 8388541 ad1 GPT (4.0G) 34 128 1 (null) (64K) 162 8388413 2 SN023432 (4.0G) Run replacement command. [root@fresh-inst:~]# zpool replace tank0 gpt/QM00002 gpt/SN023432 [root@fresh-inst:~]# zpool status pool: tank0 state: DEGRADED status: One or more devices is currently being resilvered. The pool will continue to function, possibly in a degraded state. action: Wait for the resilver to complete. scrub: resilver in progress for 0h0m, 7.88% done, 0h4m to go config: NAME STATE READ WRITE CKSUM tank0 DEGRADED 0 0 0 raidz1 DEGRADED 0 0 0 replacing DEGRADED 0 0 0 gpt/QM00002 UNAVAIL 0 2.17K 0 cannot open gpt/SN023432 ONLINE 0 0 0 39.5M resilvered gpt/SN091234 ONLINE 0 0 0 372K resilvered errors: No known data errors Initiate regular reboot (but could simulate be an instant power failure). [root@fresh-inst:~]# reboot The systems fails to boot with the following message: Booting from Hard Disk... ZFS: can only boot from disk, mirror or raidz vdevs ZFS: inconsistent nvlist contents ZFS: i/o error - all block copies unavailable ZFS: can't read MOS ZFS: unexpected object set type lld ZFS: unexpected object set type lld FreeBSD/i386 boot Default: tank0:/boot/kernel/kernel boot: ZFS: unexpected object set type lld FreeBSD/i386 boot Default: tank0:/boot/kernel/kernel boot: >Fix: As a workaround reboot from CD/DVD in fixit mode, then import the pool and wait resilvering complete. >Release-Note: >Audit-Trail: >Unformatted:
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