Loss of bits, but depending upon the usage of the system, corruption _could_ be a possibility. I could envision an scenario where you were mapping an iSCSI lun to a system, and that system had it's own FS on top of it (think VMFS or NTFS) and when it came back online, parts of the last write commands didn't get written causing that filesystem to be corrupted. Obviously this is likely an edge case scenario, but I could see it as a possibility.
The actual zpool would likely be fine and importable, but the underlying data could be corrupt if there are other filesystems layered on top of it. _____ From: Garrett D'Amore [mailto:garrett.dam...@nexenta.com] Sent: Sunday, December 11, 2011 10:35 PM To: Frank Cusack Cc: Matt Breitbach; zfs-discuss@opensolaris.org Subject: Re: [zfs-discuss] does log device (ZIL) require a mirror setup? Loss only. Sent from my iPhone On Dec 12, 2011, at 4:00 AM, "Frank Cusack" <fr...@linetwo.net> wrote: Corruption? Or just loss? On Sun, Dec 11, 2011 at 1:27 PM, Matt Breitbach <matth...@flash.shanje.com> wrote: I would say that it's a "highly recommended". If you have a pool that needs to be imported and it has a faulted, unmirrored log device, you risk data corruption. -Matt Breitbach -----Original Message----- From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-boun...@opensolaris.org] On Behalf Of Thomas Nau Sent: Sunday, December 11, 2011 1:28 PM To: zfs-discuss@opensolaris.org Subject: [zfs-discuss] does log device (ZIL) require a mirror setup? Dear all We use a STEC ZeusRAM as a log device for a 200TB RAID-Z2 pool. As they are supposed to be read only after a crash or when booting and those nice things are pretty expensive I'm wondering if mirroring the log devices is a "must / highly recommended" Thomas _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
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