Date: Wed, 12 Jun 2013 07:47:13 -0400 From: Ira Cooper <ira@wakeful.net> To: Mark Felder <feld@feld.me> Cc: freebsd-fs@freebsd.org Subject: Re: An order of magnitude higher IOPS needed with ZFS than UFS Message-ID: <CAAPGDw%2BKLGRTvFEaanxeyrB1om21m4TbRfFd0nUQOGp9Nd97gw@mail.gmail.com> In-Reply-To: <op.wykdduw834t2sn@markf.office.supranet.net> References: <51B79023.5020109@fsn.hu> <op.wykdduw834t2sn@markf.office.supranet.net>
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On Wed, Jun 12, 2013 at 7:40 AM, Mark Felder <feld@feld.me> wrote: > On Tue, 11 Jun 2013 16:01:23 -0500, Attila Nagy <bra@fsn.hu> wrote: > > BTW, the file systems are 77-78% full according to df (so ZFS holds more, >> because UFS is -m 8). >> > > ZFS write performance can begin to drop pretty badly when you get around > 80% full. I've not seen any benchmarks showing an improvement with a very > fast and large ZIL or tons of memory, but I'd expect that would help > significantly. Just note that you're right at the edge where performance > gets impacted. > > If it matches what illumos does. You jump off the same cliff. -Ira
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