immense delayed write to file system (ZFS and UFS2), performance
avg at icyb.net.ua
Thu Jan 28 13:42:40 UTC 2010
on 27/01/2010 22:26 Tommi Lätti said the following:
> Seems that the performance is indeed atrocious. I recently (like 2
> days ago) had to rescue my zfs pool under opensolaris to spare disks.
> The performance under OpenSol was what I was expecting, 70MB/s reading
> and writing at the same time.
> Now that I'm restoring the stuff back under FreeBSD 8.0-p2 it seems
> that first the array reads from the source disk and then stops reading
> and decides to empty the buffer to the destination. There's usually a
> 2 second pause and after that it goes back to reading. There seems to
> be something really wrong with this, fbsd zfs implementation seems to
> be unable to move data between 2 zfs pools writing and reading
> I think I'll just boot back to opensol and do the transfers there.
I've been seeing things like this too.
Also, when copying between UFS and ZFS.
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