Date: Mon, 22 Feb 2016 13:30:45 -0500 From: Mike Tancsa <mike@sentex.net> To: Dan Langille <dan@langille.org>, freebsd-questions@freebsd.org Subject: Re: ZFS: i/o error - all block copies unavailable Message-ID: <56CB53D5.1030709@sentex.net> In-Reply-To: <5C208714-5117-4089-A872-85A6375856B7@langille.org> References: <5C208714-5117-4089-A872-85A6375856B7@langille.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On 2/22/2016 12:41 PM, Dan Langille wrote: > I have a FreeBSD 10.2 (with freebsd-update applied) system at home > which cannot boot. The message is: ZFS: i/o error - all block > copies unavailable ZFS: can't read MOS of pool system gptzfsboot: > failed to mount default pool system > > I booted the box via mfsBSD thumb drive, and was able to import > the zpool: https://gist.github.com/dlangille/6da065e309301196b9cd > <https://gist.github.com/dlangille/6da065e309301196b9cd>; > > I have also run: "gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot > -i 1 XXX" against each drive. I did with the the files provided > with mfsBSD and with the files from my local 10.2 system. Neither > solution changed the booting problem. This is a longshot, but I ran into an odd situation like this as well a few weeks ago. It seems on the motherboard I was using, when the "DUAL" boot option is enabled in the BIOS, present all the disks to the loader early in the boot process. So, when you escape to the loader prompt, and do OK lsdev cd devices: disk devices: disk0:BIOS drive C: disk1:BIOS drive D: disk2:BIOS drive E: disk3:BIOS drive F: pxe devices: zfs devices: zfs:zroot OK In this case, 4 of the disks that are normally part of the zroot were not there resulting in ZFS: i/o error - all block copies unavailable Disabling the "DUAL" option in the BIOS and going back to legacy and listing all the drives as possible boot drives, then presents to the zfsloader all the disks, so we see the familiar BIOS drive C: is disk0 BIOS drive D: is disk1 BIOS drive E: is disk2 BIOS drive F: is disk3 BIOS drive G: is disk4 BIOS drive H: is disk5 BIOS drive I: is disk6 BIOS drive J: is disk7 This is a Supermicro SYS-7048R-C1RT4+ X10DRC-T4+ (BIOS 01/29/2015) Prior to the reboot, the other drives were not used by the zfs pool, but were added. Since the old pool didnt need them, it didnt matter. Its a longshot that this is your problem, but I will takes the chances today :) ---Mike -- ------------------- Mike Tancsa, tel +1 519 651 3400 Sentex Communications, mike@sentex.net Providing Internet services since 1994 www.sentex.net Cambridge, Ontario Canada http://www.tancsa.com/
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?56CB53D5.1030709>