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JFS2 Log sizing

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Old August 4th, 2006
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JFS2 Log sizing
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Lots of people have been giving me the old "rule of thumb" for jfs log sizing to be 2MB for every 1GB of filesystem. Does this still stand for jfs2, and why type of performance issues will you see without it?

We have some 150GB filesystems on one of our boxes that when they add an oracle datafile the whole system goes into the tank, the SAN disk that is currently being written too goes to 100% utilziation, but there's no I/O Wait. I'm thinking our 128MB JFS2 log might be to blame and am considering increasing it. Will this at least help the issue, or mask a real problem?
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Old August 12th, 2006
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Re: JFS2 Log sizing
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Hi

Have you looked at lvmstat and filemon to see what area is heavily utilised during database read/writes ?

HTH

Steve
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