Date: Fri, 25 Sep 2009 15:06:00 -0400 From: Scott Ullrich <sullrich@gmail.com> To: freebsd-fs@freebsd.org Subject: Slow disk write IO with ZFS / NFS Message-ID: <d5992baf0909251206m6421086ap3a9fdac788d71396@mail.gmail.com>
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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
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