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From: Scott Ullrich <sullrich@gmail.com>
Date: Fri, 25 Sep 2009 15:06:00 -0400
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Subject: Slow disk write IO with ZFS / NFS
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Hello,

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@freebsd8.cre8.com:/usr/obj/usr/src/sys/GENERIC  amd64

NFS is setup like:

/etc/rc.conf:
  rpcbind_enable="YES"
  rpc_lockd_enable="YES"
  rpc_statd_enable="YES"
  nfs_server_enable="YES"

/etc/exports:
  /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,

Scott