From: Beck, Joseph (jbeck@seic.com)
Date: Thu May 03 2007 - 14:24:48 EDT
Question:
What are the valid values for maxphys? Also, looking for
validation/sanity check of logic below, what am I missing.
Do I want the maxphys value to match stripe size on our storage frame?
Trying to tune I/O on a Oracle server that's doing a lot of data mining.
All datafiles are cooked.
Current env/setting:
E2900 - 8-way with 64GB RAM
EMC SAN, I'm told the stripe size for the hypers/LUNs is just under 1MB
maxphys: 131072
vol_maxio: 2048
stat cmds are showing::
iostat showing 128k read size
vxstat showing 989184
notes:
vol oradata02 1708409 416341 3301800182 11364730 63.5 2.9
3301800182 / 1708409
1932
1932 * 512
989184
So, the IO stack as I see it is:
Oracle (block size & multi-block read count) (8k & 16)
Vxfs (defaults)
Vxvm(defaults, vol_maxio: 2048)
OS (maxphys: 131072)
EMC (just under 1MB)
Joe Beck Ciber Inc. - a consultant to SEI One Freedom Valley Drive/ 100
Cider Mill Road| Oaks, PA 19456 | p: 610.676.2258 | jbeck@seic.com
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