I have a NAS device on eval which performs well with NFS reads but not with NFS writes. I can read at about 9 MByte/sec (or faster) with certain NFS clients but I can only write at 0.22 MByte/sec from any client. nfsstat looks fine -- no badcalls. here is the setup:
- RAID5 NAS device (from Western Scientific) 218GB - Alteon gigabit ethernet NIC - NFS version 2 - clients mostly run Irix 6.5 but there are a few Alphas running DU 4.0E and a Linux box running RH6 (kernel 2.2.5-15). - clients are on 100baseT - NAS box is connected to a Baystack 350-24T switch with a gigabit uplink module
what could be causing this poor NFS write performance?
matt harrington 415-476-4628
Matt Harrington matt@ucsd.EDU writes:
what could be causing this poor NFS write performance?
I'd suggest checking for ethernet problems and errors ("ifstat -a" and "netstat -i"). You want to determine whether it is an NFS or networking problem.
Also try enabling or disabling auto-negotiation on your GB switch. This has caused problems for us in the past.
- Dan
-
Daniel Quinlan -
Matt Harrington