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Made an upgrade of RAID firmware and latency as it seems have increased.

Could you please advise on the most accurate way to examine disk read and write latencies?

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time command can be used. copy a big file and calculate how much time it taking – vnix27 Feb 22 '11 at 13:29
    
Look at this question: Linux Tool command to check file system performance – coredump Feb 22 '11 at 14:09
up vote 2 down vote accepted

IOzone great benchmark.

Run Random Read, Random Write, Random Mix test to check latencies.

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The common tool in Linux hard disk tuning and basic performance monitoring is hdparm.

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you can use dd to mesure the latency of a disk

eg.

dd if=/dev/zero of=/root/testfile bs=512 count=1000 oflag=dsync
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