I have a problem with NFS writing on my DEC machines. We have a
monitoring/logging process going that needs to write to an NFS drive, but
for some reason, on our DEC machines, it goes too slow and can't keep up. I
have tried numorous things. To many settings to even want to think about
anymore. This same program runs on our Suns(Solaris 2.6) and runs by about
a factor of 15 faster. One of our engineers broke it down and figured out
that it was all slowing down on the writes to the drive. It wasn't the
program itself.
I have tracked it down to what am sure must be something with a DEC NFS client.
Here are the combinations I have tried.
Sun NFS Server - DEC NFS Client = SLOW
DEC NFS Server - DEC NFS Client = SLOW
Sun NFS Server - Sun NFS Client = FAST
DEC NFS Server - Sun NFS Client = FAST
Sun Write to local drive = FAST
DEC Write to Loac Drive = FAST
The only factor that made it slow everytime was when it was a DEC NFS
Client. The Sun wrote to the DEC NFS drive just as fast as Sun to Sun, but
the DEC client still couldn't.
I have tried the following changes on the DEC NFS client.These settings
have been tried on a 400 mhz machine and a 600au machine. Both running on a
lightly loaded 100meg network.
Setting the NFS server and client deamons up 32/16, no change, besides,
this is the only process running.
Tried Hard/Soft mount options, no change.
Tried setting the read cache and write cache up, no change, well, not
better anyways, tried many settings, all powers of 2.
Tried setting the inet settings:(Thanks to Mark Ray, who gave these to one
of my engineers)
udp_sendspace=655360
udp_recvspace-655360
tcp_sendspace=655360
tcp_recvspace=655360
tcp_mssdflt=655360
Up by a good percentage, no help.
(I also rasied the sb_max value to corrospond with these changes)
I also tried setting the drive to mount as UDP and as TCP, no change.
Turned sync on and off, (sync would take forever, or it just didn't work,
didn't wait to see)
Anything else I could try? Any ideas? I know these DEC have never realy
been tweaked or optimally configured for our uses, maybe there is something
I should do in general to help. I haven't done any patch installs on these
machines either, could that be a problem? Is there a patch search database
at DEC I could use to search their patches and see if there is a fix?
Thanks for any help you can offer, hopefulyl I fan figure this out and put
out a good SUMMARY on everything I did here.
-grant
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Grant Schoep, grant_at_storm.com
System/Network Administrator
L3 Communications Telemetry & Instrumentation
San Jose,CA (408)271-0800, Ext. 135
Received on Wed Feb 10 1999 - 02:10:59 NZDT