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Chapter 1 Overview of Performance Monitoring Function
millisecond.
(2) Unit to sum up
Units to sum up are the units used for summarizing statistic information. iSM summarizes statistic information by
the following types of components and accumulates them separately.
(i)
By logical disk
Load state of each logical disk of the monitored disk array is accumulated. Statistic information is accumulated for
the number of logical disks.
(ii)
By host port
Load state of each host port of the monitored disk array is accumulated. Statistic information is accumulated for the
number of host ports.
(iii) By disk port
Load state of each disk port of the monitored disk array is accumulated. Statistic information is accumulated for the
number of disk ports.
(iv) By physical disk
Load state of each physical disk of the monitored disk array is accumulated. Statistic information is accumulated for
the number of physical disks.
(v)
By RANK
Load state of each RANK of the monitored disk array is accumulated. Statistic information is accumulated for the
number of RANKs.
(3) Load types
Load types are the types of loads of the monitored disk array. iSM distinguishes the following types of loads when it
accumulates statistic information.
Write
Write Hit
Read
Read Hit
Prefetch Hit
Busy
Others
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The statistic information accumulated on the iSM management server can be summarized, extracted and edited by
downloading on the iSM client. Downloading is allowed for clients of levels L2 or L3. If the iSM server is operating,
downloading is performed on the Performance Monitor screen. If the iSM server is not operating, downloading is allowed
with an FTP tool.
Statistic information regarding data write operation.
Statistic information about operations that could respond quickly, by writing data to cache only.
It is a subset of Write.
Statistic information regarding data read operation.
Statistic information regarding data read operation which hit cache. It is a subset of Read.
Statistic information regarding data read operation which hit data transferred from the physical
disk to cache in advance by the prefetch function of the disk device. It is a subset of Read Hit.
Statistic information on the operating rate of a physical disk.
Statistic information regarding SCSI command process other than data write and data read.
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