And, for the record, this is my fault. There is an aspect of endianness that I simply hadn't thought of. When I have a little more time I will blog about the whole thing, because there are many useful lessons here.
Thank you, Matt, for all your help with this. And my apologies to everyone else for the disruption. Jeff On Mon, Nov 23, 2009 at 09:15:48PM -0800, Matthew Ahrens wrote: > We discovered another, more fundamental problem with > dedup=fletcher4,verify. I've just putback the fix for: > > 6904243 zpool scrub/resilver doesn't work with cross-endian > dedup=fletcher4,verify blocks > > The same instructions as below apply, but in addition, the > dedup=fletcher4,verify functionality has been removed. We will investigate > whether it's possible to fix these isses and re-enable this functionality. > > --matt > > > Matthew Ahrens wrote: > >If you did not do "zfs set dedup=fletcher4,verify <fs>" (which is > >available in build 128 and nightly bits since then), you can ignore this > >message. > > > >We have changed the on-disk format of the pool when using > >dedup=fletcher4,verify with the integration of: > > > > 6903705 dedup=fletcher4,verify doesn't byteswap correctly, has lots > >of hash collisions > > > >This is not the default dedup setting; pools that only used "zfs set > >dedup=on" (or =sha256, or =verify, or =sha256,verify) are unaffected. > > > >Before installing bits with this fix, you will need to destroy any > >filesystems that have had dedup=fletcher4,verify set on them. You can > >preserve your existing data by running: > > > > zfs set dedup=<any other setting> <old fs> > > zfs snapshot -r <old fs>@snap > > zfs create <new fs> > > zfs send -R <old fs>@snap | zfs recv -d <new fs> > > zfs destroy -r <old fs> > > > >Simply changing the setting from dedup=fletcher4,verify to another > >setting is not sufficient, as this does not modify existing data. > > > >You can verify that your pool isn't using dedup=fletcher4,verify by running > > zdb -D <pool> | grep DDT-fletcher4 > >If there are no matches, your pool is not using dedup=fletcher4,verify, > >and it is safe to install bits with this fix. > > > >Build 128 will be respun to include this fix. > > > >Sorry for the inconvenience, > > > >-- team zfs > > > _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
