On Mon, Jul 30, 2012 at 12:44 PM, Richard Elling <richard.ell...@gmail.com>wrote:
> On Jul 30, 2012, at 10:20 AM, Roy Sigurd Karlsbakk wrote: > > ----- Opprinnelig melding ----- > > On Mon, Jul 30, 2012 at 9:38 AM, Roy Sigurd Karlsbakk > > <r...@karlsbakk.net> wrote: > > Also keep in mind that if you have an SLOG (ZIL on a separate > > device), and then lose this SLOG (disk crash etc), you will > > probably > > lose the pool. So if you want/need SLOG, you probably want two of > > them in a mirror… > > > That's only true on older versions of ZFS. ZFSv19 (or 20?) includes > > the ability to import a pool with a failed/missing log device. You > > lose any data that is in the log and not in the pool, but the pool > > is > > importable. > > > Are you sure? I booted this v28 pool a couple of months back, and > > found it didn't recognize its pool, apparently because of a missing > > SLOG. It turned out the cache shelf was disconnected, after > > re-connecting it, things worked as planned. I didn't try to force a > > new import, though, but it didn't boot up normally, and told me it > > couldn't import its pool due to lack of SLOG devices. > > > Positive. :) I tested it with ZFSv28 on FreeBSD 9-STABLE a month or > > two ago. See the updated man page for zpool, especially the bit about > > "import -m". :) > > > On 151a2, man page just says 'use this or that mountpoint' with import -m, > but the fact was zpool refused to import the pool at boot when 2 SLOG > devices (mirrored) and 10 L2ARC devices were offline. Should OI/Illumos be > able to boot cleanly without manual action with the SLOG devices gone? > > > No. Missing slogs is a potential data-loss condition. Importing the pool > without > slogs requires acceptance of the data-loss -- human interaction. > -- richard > > -- > ZFS Performance and Training > richard.ell...@richardelling.com > +1-760-896-4422 > > > I would think a flag to allow you to automatically continue with a disclaimer might be warranted (default behavior obviously requiring human input). --Tim
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