Interesting...here at AMD we're using NetApp filers (dual Gbit attached)
and we're finding that in RHEL 5.1 we get great streaming NFS
performance (i.e. "big files") but abysmal small file performance (files
smaller than 1KiB or so).
For example, copying a directory full of tiny files (such as symlinks)
takes as much as 5x longer using RHEL5.1 than it did using RHEL3. We've
checked all of the relevant mount options and it all looks the same.
Our TAM told us that RHEL4 and RHEL5 had made some adjustments to the
NFS stack to optimize for streaming NFS performance (at the expense of
random I/O performance), but I don't think it was supposed to be this
drastic.
I've been getting reports from some members of my team that RHEL 5.2
beta has much better small-file NFS performance (though still way worse
than RHEL3).
So -- unfortunately I don't have an answer for you, but I can suggest
that you play with the clients a bit -- it might not be a problem with
your NFS server.
Paul Krizak 7171 Southwest Pkwy MS B400.2A
Advanced Micro Devices Austin, TX 78735
Linux/Unix Systems Engineering Desk: (512) 602-8775
Silicon Design Division Cell: (512) 791-0686
FM wrote:
Hello,
The server : RHEL 4.6
The Stations : RHEL 5.1
All home folders use nfs.
When I copy using NFS (a big 2GB file for ex) I have a speed of 2.5 MB/s
and my desktop is freezing.
using SAMBA (same test, same server, same station), the speed is 10 MB/s.
serveur setting :
RPCNFSDCOUNT=16
exportfs settings :
@linux-all(rw,async,root_squash)
On the station, we are using autofs with these settings :
* -intr,async nfs-users.lan.lexum.pri:/home/users/lexum/&
/proc/mounts :
/etc/auto.home /home/users/lexum autofs
rw,relatime,fd=17,pgrp=9303,timeout=10,minproto=5,maxproto=5,indirect 0 0
nfs-users.lan.lexum.pri:/home/users/lexum/mederyf
/home/users/lexum/mederyf nfs
rw,relatime,vers=3,rsize=32768,wsize=32768,hard,proto=tcp,timeo=600,retrans=2,sec=sys,addr=192.168.4.29
0 0
Are there some settings to tune NFS to get a descent speed ?
Tx!
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