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IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning
book

IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning

by Cathy Warrick, Craig Gordon, Benoit Granier, Keitaro Imai, Rosemary McCutchen, Brannen Proctor, Jim Sedgwick, Paulus Usong, Mary Ann Vandermark, John Wickes
December 2005
Intermediate to advanced content levelIntermediate to advanced
530 pages
18h 34m
English
IBM Redbooks
Content preview from IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning
206 IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning
Remember, sa2 will remove the data collection files over a week old as scheduled in cron.
You can save sar info to view later with the commands:
sar -A -o data.file interval count > /dev/null & [SAR data saved to data.file]
sar -f data.file [Read SAR info back from saved file:]
All data is captured in binary form and saved to a file (data.file). The data can then be
selectively displayed with the sar command using the -f option.
sar summary
sar helps to tell quickly if a system is I/O bound. Remember though, that a busy system can
mask I/O issues since io_wait counters are not increased ...
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ISBN: 0738494119Purchase book