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sar NFS I/O wait and performance issues
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Dariusz Dolecki
Aug 9, 2012, 10:16:03 AM8/9/12
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Hi,
I am running Solaris 10 on VMware and mounting an Oracle database via NFS. I am using sar to collect I/O wait and NFS statistics. I have noticed that when the I/O wait is high, the NFS calls/sec and reads/sec are high too.
Now a high I/O wait simply indicates the percentage of time the CPU was idle while during which the system had an outstanding disk(in this case NFS) I/O request.
Can I correlate a high I/O wait % with something on the storage side(we are mounting storage via NFS) does a high I/O wait% imply that there are more outstanding NFS requests? Will increasing the b/w of the pipe fix this issue?
Thanks in advance,
Dariusz
I am running Solaris 10 on VMware and mounting an Oracle database via NFS. I am using sar to collect I/O wait and NFS statistics. I have noticed that when the I/O wait is high, the NFS calls/sec and reads/sec are high too.
Now a high I/O wait simply indicates the percentage of time the CPU was idle while during which the system had an outstanding disk(in this case NFS) I/O request.
Can I correlate a high I/O wait % with something on the storage side(we are mounting storage via NFS) does a high I/O wait% imply that there are more outstanding NFS requests? Will increasing the b/w of the pipe fix this issue?
Thanks in advance,
Dariusz
Dariusz Dolecki
Aug 9, 2012, 11:06:38 AM8/9/12
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