Just to throw in a monkey wrench,
#1: Are all of the ethernet devices using the same duplexing (if on the
same subnet)?
#2: Are the intervening switches all set to the "right" duplexing?
#3: If writing to a journaled filesystem, larger blocks cut down on the
time spent managing the journal
#4: Can other (non-z or VM instances) get better throughput from the file
server appliance?
You can test #3 by:
dd if=/snap1/FNB/12-31-04/IMG/004.FNB/I005/0400500170a.TIF of=/dev/null
bs=32768
and adjusting the block size for each test pass.
--------------------
John R. Campbell, Speaker to Machines (GNUrd) (813) 356-5322 (t/l 697)
Adsumo ergo raptus sum
MacOS X: Because making Unix user-friendly was easier than debugging
Windows.
Red Hat Certified Engineer (#803004680310286)
IBM Certified: IBM AIX 4.3 System Administration, System Support
----- Forwarded by John Campbell/Tampa/IBM on 09/22/06 10:53 AM -----
Marcy Cortes
<[EMAIL PROTECTED]
ellsfargo.com> To
Sent by: Linux on [email protected]
390 Port cc
<[EMAIL PROTECTED]
IST.EDU> Subject
Re: [LINUX-390] NFS too slow
09/22/06 03:55 AM
Please respond to
Linux on 390 Port
<[EMAIL PROTECTED]
IST.EDU>
Adam, upping to 32K resulting in all errors:
cp: reading `/snap1/FNB/12-31-04/IMG/004.FNB/I005/0400500170a.TIF':
Input/output error
10.xx.1.94:/SHARE1 on /snap1 type nfs
(rw,nfsvers=3,rsize=32768,wsize=32768,hard,lock,addr=10.xx.1.94)
I guess I'll try to figure out what's up with the TCP not working.
Rob, plenty of horsepower - no cpu contraints or paging going on at the
moment. The disk should be very fast - 200G LVM striped over 32 mod 9
volumes, DS8000, FICON, 4 paths.
Marcy Cortes
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-----Original Message-----
From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of
Rob van der Heij
Sent: Friday, September 22, 2006 12:47 AM
To: [email protected]
Subject: Re: [LINUX-390] NFS too slow
> > Any suggestions?
As Adam points out, stay away from UDP if you can.
And you want to make sure it's not your end that is the bottleneck. A
sustained rate of 1 MB/s should be possible, but writing to disk takes a
lot of smoke and there is enough room for surprises. At least check that
the virtual machine is not CPU constrained or suffering from paging.
Rob
--
Rob van der Heij
Velocity Software, Inc
http://velocitysoftware.com/
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