If you need to gather statistics about your I/O response times on AIX, it’s hard to beat the iostat command. The iostat command reports CPU, input/output statistics for the whole OS, adapters, file systems, and even tape drives if you have them. The problem with iostat is that it provides too much information to choose from. Figure 1 shows the number of flags available (this is from the iostat command documentation). If you find that overwhelming, here’s a selection of flags ...

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