Dell PowerVault 720N, Command Reference Manual, Page: 365 / 606

System Information and Performance17-3
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The
vol status -r
command displays a list of the RAID information. The display
is the same as the
sysconfig -r
display.
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The
vol status
-v command displays information about each RAID group.
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You use the
sysstat
and
uptime
commands to display filer statistics.
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The
sysstat
command displays information about CPU utilization, file operations,
read and write operations on disks and tapes, and the age of data in the cache buffer.
By default, the filer displays statistics every 15 seconds; you can specify the interval,
in seconds, at which statistics are displayed.
The
sysstat
output is particularly useful for revealing file access patterns on your
filer, from which you can determine whether you should install more NVRAM, system
memory, or disks.
Depending on the applications that access the filer, the computers on the network,
and the network configuration, the following suggested actions might improve your
filer’s performance:
‡
The data in the Cache age column indicates how fast read operations are cycling
through system memory. If the values in the Cache age column are consistently
below 5, the filer might benefit from more system memory. Cache age shows
the age of the oldest read-only blocks in memory. A low cache age means that
the filer is retrieving information from disk instead of from memory. For informa-
tion about adding memory, see “About the Uptime Command.” If the CPU
utilization percentage in the CPU column is low but you are not getting the
expected performance, you might need to add disks to the system.
‡
If CPU utilization is high, you might need to add another filer.
‡
If the network traffic shown in the Net Kb/s column is at or near the capacity of
the network interface (1 MB per Ethernet adapter) you might need to add
another network adapter card to the system.