Date: Mon, 24 Mar 2008 13:30:02 -0700 From: Alex Frangis <qapf@qapf.com> To: freebsd-fs@freebsd.org Subject: RE: ZFS zvol write speed incredibly slow Message-ID: <1B17BAE7-D770-4035-8B56-35BD0A20EB3C@qapf.com>
next in thread | raw e-mail | index | archive | help
I just wanted to check in and say that I myself am encountering the same problem. I just got 7.0-Release online and working and I am seeing similar numbers to yours on a box that performed quite well running solaris. Configuration: AMD Semperon 3100+ 64bit Enabled 2gb Ram 3x 750GB Drives in a single Raid-Z Thanks, Alex Hi guys! I just got 7.0-RELEASE installed and running on my home server, and I've noticed incredibly slow write speeds to a ZFS zvol. Reading speeds seem normal. It may be related to the OpenSolaris bug #6428639: http://bugs.opensolaris.org/view_bug.do?bug_id=6428639 >> To another zpool: # dd if=junk of=/tank2/junk bs=65536 1024+0 records in 1024+0 records out 67108864 bytes transferred in 0.331802 secs (202255676 bytes/sec) >> To a zvol in the same pool: dd if=junk of=/dev/zvol/tank/tempvol bs=65536 1024+0 records in 1024+0 records out 67108864 bytes transferred in 11.575167 secs (5797658 bytes/sec) Using smaller block sizes exacerbates the problem (444606 bytes/sec with 4096-byte blocks!)
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?1B17BAE7-D770-4035-8B56-35BD0A20EB3C>