Date: Fri, 10 Sep 2010 20:50:55 -0400 (EDT) From: Rick Macklem <rmacklem@uoguelph.ca> To: gil@vidals.net Cc: freebsd-fs@freebsd.org Subject: Re: ZFS write speed performance tuning (NFS) Message-ID: <1639122954.761765.1284166255552.JavaMail.root@erie.cs.uoguelph.ca> In-Reply-To: <AANLkTikv8H6uj12fXqXrcvMWeD-LhsUHwbQRjh9fS-zM@mail.gmail.com>
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> I'm building my first ZFS NAS and I'm struggling with write speeds > over NFS. > I want to know if it is possible to somehow set NFS to async AND keep > slogging active with my SSD write cache? > > Here is a brief run down of my write speeds on a 1 gigabit LAN and > FreeBSD > 8.1 using ZFS: > > WRITE SPEEDS of 1 GB file: > 55 MB/sec: scp copy test > 28 MB/sec: NFS with async (zil_disable="1") > 12 MB/sec: NFS with sync (default settings) > > 3 x 1TB 7200 RPM SATA HDs > CPU Intel i7 > Controller: LSI 1068e > Controller: ICH10R (for read and write SSDs) > > This NAS will eventually go into my VMware environment and > unfortunately ESX > uses o_sync in their NFS client. AFAIK, there is no way to change the > VMware > NFS client, so I thought of turning off async on the server side and > yet > somehow still use the ZIL SSD Cache for fast writes? > > Looking forward to learning more about ZFS. > > --Gil Vidals > It sounds like you may already be doing this, but the following email suggests that the log be on a separate SSD device. >From freebsd-fs archive:http://docs.FreeBSD.org/cgi/mid.cgi?4ABD56D6.50301
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