Date: Sat, 08 Mar 2008 00:53:58 -0800 From: Reed Wilson <cedilla@gmail.com> To: freebsd-fs@freebsd.org Subject: ZFS zvol write speed incredibly slow Message-ID: <47D25426.8050505@gmail.com>
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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!) -- Reed
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