Slow disk write IO with ZFS / NFS
sullrich at gmail.com
Fri Sep 25 19:28:16 UTC 2009
Now that ZFS has been declared "Production ready" I have been playing
around with RC1 + NFS + ZFS.
It seems that write speeds when using ZFS + NFS are pretty poor (on
average 5 megabyte a second). When I bench the ZFS pool without NFS
I can see up to 175 megabytes a second write speed.
The system in question is a Dell 2850 with 6 ULTRA 300 SCSI 10K RPM
drives (Dual 3.4 ghz XEON) running RC1/AMD64:
FreeBSD freebsd8.cre8.com 8.0-BETA4 FreeBSD 8.0-BETA4 #2: Fri Sep 25
10:55:46 UTC 2009
sullrich at freebsd8.cre8.com:/usr/obj/usr/src/sys/GENERIC amd64
NFS is setup like:
/vmfs -maproot=root -network 10.0.250.0 -mask 255.255.255.
Does anyone have any pointers on how to speed this up without putting
the data in jeopardy during a power failure, etc (ie: leaving ZIL on).
Thanks in advance,
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