tag:blogger.com,1999:blog-2036420899560998305.post4944873134549467134..comments2009-05-26T15:13:03.106+10:00Froghttp://www.blogger.com/profile/09536063443257243800noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-2036420899560998305.post-47438858156782023092009-05-26T15:13:03.106+10:002009-05-26T15:13:03.106+10:00zvols work well in the MFC on -STABLE. It appears before there was an fscync instead of ZIL commit and we now get ufs zvol speeds close to zfs :<br /><br />www# time dd if=/dev/zero of=/mnt/512MB count=512 bs=1M<br />512+0 records in<br />512+0 records out<br />536870912 bytes transferred in 20.236759 secs (26529491 bytes/sec)<br />0.000u 1.799s 0:20.25 8.8% 26+1516k 0+4115io 0pf+0w<br /><br />www# mount | grep /mnt<br />/dev/zvol/tank/ufs on /mnt (ufs, local)<br /><br />www# time dd if=/dev/zero of=/tank/bigfiles/512MB count=512 bs=1M<br />512+0 records in<br />512+0 records out<br />536870912 bytes transferred in 23.743324 secs (22611447 bytes/sec)<br />0.007u 0.845s 0:23.75 3.5% 26+1528k 0+0io 0pf+0w<br />www# zfs list tank/bigfiles<br />NAME USED AVAIL REFER MOUNTPOINT<br />tank/bigfiles 995M 806G 995M /tank/bigfiles<br /><br />www# uname -a<br />FreeBSD zfs.freebsd.test 7.2-STABLE FreeBSD 7.2-STABLE #0: Mon May 25 17:24:17 UTC 2009 root@zfs.freebsd.test:/usr/obj/usr/src/sys/GENERIC amd64Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2036420899560998305.post-36427623105262016402009-04-12T13:50:00.399+10:002009-04-12T13:50:00.399+10:00You might want to mention the sysctl paramaters and the kernel limitiation that are necessary to ensure that zfs doesn't crash the kernel if you run out of kernel memory. Its in the tuning guide, but they really don't make enough of a stink that tuning the zfs requires some tinkering in order to be stable.Anonymousnoreply@blogger.com