Date: Tue, 6 Apr 2010 21:34:59 +0400 From: Mikle Krutov <nekoexmachina@gmail.com> To: freebsd-fs@freebsd.org Subject: Re: Strange ZFS performance Message-ID: <20100406173459.GA1285@takino.homeftp.org> In-Reply-To: <20100404191844.GA5071@takino.homeftp.org> References: <20100404191844.GA5071@takino.homeftp.org>
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On Sun, Apr 04, 2010 at 11:18:45PM +0400, Mikle wrote: > Hello, list! > I've got some strange problem with one-disk zfs-pool: read/write performance for the files on the fs (dd if=/dev/zero of=/mountpoint/file bs=4M count=100) gives me only 2 MB/s, while reading from the disk (dd if=/dev/disk of=/dev/zero bs=4M count=100) gives me ~70MB/s. > pool is about 80% full; PC with the pool has 2GB of ram (1.5 of which is free); i've done no tuning in loader.conf and sysctl.conf for zfs. In dmesg there is no error-messages related to the disk (dmesg|grep ^ad12); s.m.a.r.t. seems OK. > Some time ago disk was OK, nothing in software/hardware has changed from that day. > Any ideas what could have happen to the disk? > > Wbr, Well, list, somehow after moving some important files (about 50GB) to other disk performance became OK. I did not get why it was so crappy, if anyone could give me any ideas - that would be great. Everyone, thanks for the replies. -- Wbr, Krutov Mikle
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