Date: Thu, 28 Jan 2010 15:42:35 +0200 From: Andriy Gapon <avg@icyb.net.ua> To: =?UTF-8?B?VG9tbWkgTMOkdHRp?= <sty@iki.fi> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: immense delayed write to file system (ZFS and UFS2), performance issues Message-ID: <4B61944B.8090602@icyb.net.ua> In-Reply-To: <f43ef3191001271226l1d87b986yb257df93d62e08e5@mail.gmail.com> References: <cf9b1ee01001261515n72f32265tf8dd0da5c8a3ec3c@mail.gmail.com> <4B6022C6.1090608@andric.com> <f43ef3191001271226l1d87b986yb257df93d62e08e5@mail.gmail.com>
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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 > simultaneously... > > 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. -- Andriy Gapon
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