Dell PowerVault MD3200 Owner's Manual page 59

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The Performance Monitor data provides information about how your storage
array is performing. The data is presented in eight columns, which are
described in this table. Use this data to make performance tuning decisions
for your storage array.
Table 4-3. Performance Monitor Table Description
Column Headings
Devices
Total IOs
Read Percentage
Cache Hit Percentage
Current KB/second
Maximum KB/second
Current IO/second
Maximum IO/second
For more information, see the online help topics.
Planning: MD3200 Series Storage Array Terms and Concepts
Description
Controller, virtual disk or storage array total.
Cumulative IO's per second from last start time.
Percentage of cumulative IO's that are READs.
Percentage of cumulative IO's that are in-cache.
Snapshot of throughput value per second (1KB = 1024
bytes).
Maximum recorded throughput value from last start time.
Snapshot of IO's per second (IOP = Input/output per
second or one completed I/O transaction).
Maximum recorded IOP from last start time.
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