Date: Tue, 26 Jan 2010 08:59:27 -0800 From: Chuck Swiger <cswiger@mac.com> To: =?iso-8859-1?Q?Gerrit_K=FChn?= <gerrit@pmp.uni-hannover.de> Cc: freebsd-stable@freebsd.org Subject: Re: ZFS "zpool replace" problems Message-ID: <5F20B2B6-D75C-4E27-9CC9-85C6E64D13BD@mac.com> In-Reply-To: <20100126172503.927e1bb5.gerrit@pmp.uni-hannover.de> References: <20100126143021.GA47535@icarus.home.lan> <20100126160320.6ed67b92.gerrit@pmp.uni-hannover.de> <FA0BAC0D-35A7-4296-B52C-9D4D8A6CC609@mac.com> <20100126172503.927e1bb5.gerrit@pmp.uni-hannover.de>
next in thread | previous in thread | raw e-mail | index | archive | help
Hi-- On Jan 26, 2010, at 8:25 AM, Gerrit Kühn wrote: > CS> There's your problem-- the Silicon Image 3112/4 chips are remarkably > CS> buggy and exhibit data corruption: > > Hm, sure? I'm sure that the SII 3112 is buggy. I am not sure that it is the primary or only cause of the problems you describe. [ ... ] > I already thought about replacing the controller to get rid of the > detach-problem. However, I cannot do this online and I really would prefer > fixing the disk firmware problem first. > I could remove the hotspare drive ad14 and use this slot for putting in a > replacement disk. Is it possible to get ad18 out of zfs' replacing > process? Maybe by detaching the disk from the pool? I don't know enough about ZFS to provide specific advice for recovery attempts (aside from the notion of restoring your data from a backup instead). As a general matter of maintaining RAID systems, however, the approach to upgrading drive firmware on members of a RAID array should be to take down the entire container and offline the drives, update one drive, test it (via SMART self-test and read-only checksum comparison or similar), and then proceed to update all of the drives (preferably doing the SMART self-test for each, if time allows) before returning them to the RAID container and onlining them. Pulling individual drives from a RAID set while live and updating the firmware one at a time is not an approach I would take-- running with mixed firmware versions doesn't thrill me, and I know of multiple cases where someone made a mistake reconnecting a drive with the wrong SCSI id or something like that, taking out a second drive while the RAID was not redundant, resulting in massive data corruption or even total loss of the RAID contents. Regards, -- -Chuck
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?5F20B2B6-D75C-4E27-9CC9-85C6E64D13BD>