Strange ZFS performance
nekoexmachina at gmail.com
Mon Apr 5 06:56:34 UTC 2010
On Sun, Apr 04, 2010 at 10:08:21PM -0500, Wes Morgan wrote:
> On Sun, 4 Apr 2010, 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?
> Has it ever been close to 100% full? How long has it been 80% full and
> what kind of files are on it, size wise?
No, it was never full. It is at 80% for about a week maybe. Most of the files are the video of the 200MB - 1.5GB size per file.
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