Date: Tue, 19 Oct 2010 23:58:29 +0200 From: Willem Jan Withagen <wjw@digiware.nl> To: Freddie Cash <fjwcash@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS 'read-only' device / pool scan / import? Message-ID: <4CBE1485.2070400@digiware.nl> In-Reply-To: <AANLkTi=DikO4-N8BG4U0WBX-7ypbPkVCR8=vHSaeN3qV@mail.gmail.com> References: <AE519076FDEA1259C5DEA689@HexaDeca64.dmpriest.net.uk> <20101019151602.GA61733@icarus.home.lan> <7BEF90D9F4D4CB985F3573C3@HexaDeca64.dmpriest.net.uk> <4CBDFFF6.5080701@digiware.nl> <AANLkTi=DikO4-N8BG4U0WBX-7ypbPkVCR8=vHSaeN3qV@mail.gmail.com>
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On 2010-10-19 23:03, Freddie Cash wrote: > While using labelled devices (be it glabel, gpt label, or whatever) > certainly helps keep things ordered and working. > > However, ZFS also labels the devices in the pool. A simple "zpool > export poolname" followed by a "zpool import poolname" will scan the > metadata on the drives, find all the devices in the pool, re-order > things internally, and carry on. > > Back when I started with ZFS, I used unlabelled drives (also on 3Ware > controllers) and made the mistake once of booting with a failed drive > removed. Pool came up faulted saying all the drives after the missing > one were also faulted. Thought I lost the whole pool. However, some > digging online showed the export/import info, and I was able to > continue on without losing any data. At the moment I have two 10Tb systems available so I'm experimenting a lot to get a feeling on how easy recovering is. So your comments are well appreciated. And your suggestion is that although things looked really messed up, just export/import fixed the lot.... The GPT trick is sort of selfdocumenting, because it is otherwise real easy to get lost with 10 disks and 4 flash-devices. :( And just because I yanked a single log disk (the wrong one) I ended up with a corrupt zraid. So the least lesson for me here (again) has been that disk handling requires the utmost care. Trouble is just around the corner. --WjW
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