[zfs-discuss] Re: Undo/reverse zpool create
Joubert Nel wrote: Hi, If I add an entire disk to a new pool by doing zpool create, is this reversible? I.e. if there was data on that disk (e.g. it was the sole disk in a zpool in another system) can I get this back or is zpool create destructive? Short answer: you're stuffed, and no, it's not reversible. Long answer: see the short answer. Darn! If the device was actually in use on another system, I would expect that libdiskmgmt would have warned you about this when you ran zpool create. When I ran zpool create, the pool got created without a warning. What is strange, and maybe I'm naive here, is that there was no formatting of this physical disk so I'm optimistic that the data is still recoverable from it, even though the new pool shadows it. Or is this way off mark? Joubert This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Re: Undo/reverse zpool create
On Thu, Jun 21, 2007 at 11:03:39AM -0700, Joubert Nel wrote: When I ran zpool create, the pool got created without a warning. zpool(1M) will diallow creation of the disk if it contains data in active use (mounted fs, zfs pool, dump device, swap, etc). It will warn if it contains a recognized filesystem (zfs, ufs, etc) that is not currently mounted, but allow you to override it with '-f'. What was previously on the disk? What is strange, and maybe I'm naive here, is that there was no formatting of this physical disk so I'm optimistic that the data is still recoverable from it, even though the new pool shadows it. Or is this way off mark? You are guaranteed to have lost all data within the vdev label portions of the disk (see on-disk specification from opensolaris.org). How much else you lost depends on how long the device was active in the pool and how much data was written to it. - Eric -- Eric Schrock, Solaris Kernel Development http://blogs.sun.com/eschrock ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Re: Undo/reverse zpool create
Joubert Nel wrote: If the device was actually in use on another system, I would expect that libdiskmgmt would have warned you about this when you ran zpool create. AFAIK, libdiskmgmt is not multi-node aware. It does know about local uses of the disk. Remote uses of the disk, especially those shared with other OSes, is a difficult problem to solve where there are no standards. Reason #84612 why I hate SANs. When I ran zpool create, the pool got created without a warning. If the device was not currently in use, why wouldn't it proceed? What is strange, and maybe I'm naive here, is that there was no formatting of this physical disk so I'm optimistic that the data is still recoverable from it, even though the new pool shadows it. Or is this way off mark? If you define formatting as writing pertinent information to the disk such that ZFS works, then it was formatted. The uberblock and its replicas only take a few iops. -- richard ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
