On Jul 24, 2010, at 2:20 PM, Edward Ned Harvey wrote: > I remember asking about this a long time ago, and everybody seemed to think > it was a non-issue. The vague and unclearly reported rumor that ZFS behaves > poorly when it's 100% full. Well now I have one really solid data point to > confirm it. And possibly how to reproduce it, avoid it, and prevent it.
I am given to understand that you can delete snapshots in current builds (I don't have anything recent where I can test). > > I'm looking to see if anyone else has similar or related issues. Of > particular value, if you have any test machine to attempt reproducing the > problem, that could be very valuable. <snip> > > > Before there is a problem, create a new zfs filesystem, with a space > reservation. > zfs create -o reservation=1G tank/reservation Yes, this works. You don't need much space to recover what I do is drop the reservation down about 10% from the original size and proceed to free up space. I don't remove the reservation entirely because I use a small reservation (100M) and I don't want to be caught out if something is trying to write and I missed it. Shawn
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