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From: Wes Morgan <morganw@chemikals.org>
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To: Mikle <nekoexmachina@gmail.com>
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Cc: freebsd-fs@freebsd.org
Subject: Re: Strange ZFS performance
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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?