HP Insight Control - Manual (Page 55)

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Disk Millisecond/Write—The average time required to complete a write operation
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Disk Queue Length—The average number of transfer requests (reads and writes) waiting to
be serviced by the SAS drive, including transfers currently being serviced and transfers waiting
for service, regardless of where the request is waiting (drive or controller)
Insight Control performance management uses a set of algorithms to determine the SAS drive status.
The Disk Queue Length is a primary parameter. However, when the value of the Disk Queue Length
exceeds the acceptable value, the Disk Reads/Sec and Writes/Sec are examined to determine
whether read or write operations require most of the drive throughput. When combined with Disk
Millisecond/Read or Write, Performance Management can determine if the number of requests
for the drive will exceed the capabilities of the drive.
SAS Drive Inventory
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Drive Information
Displays description of the drive, including size ◦
◦ Displays the hard drive model number
◦ Displays the exact size of the drive as seen by the operating system
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Configuration Information
Provides a summary of the drive configuration ◦
◦ Displays the name of the Smart Array controller to which it is attached
◦ Displays the location of the hard drive in its enclosure
◦ Displays the array in which the drive is configured
◦ Provides the SAS protocol negotiated for transfers between this drive and the disk controller
SCSI drive
The following information is provided for a SCSI drive.
SCSI Drive Status
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Disk Reads/Sec—The average number of reads from the selected SCSI drive each second
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Disk Writes/Sec—The average number of writes to the selected SCSI drive each second
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Disk Read MBytes/Sec—The average number of megabytes read from the selected SCSI drive
each second
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Disk Write MBytes/Sec—The average number of megabytes written to the selected SCSI drive
each second
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Disk Millisec/Read—The average time required to complete a read
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Disk Millisec/Write—The average time required to complete a write
•
Disk Queue Length—The average number of transfer requests (reads and writes) waiting to
be serviced by the SCSI drive, including transfers currently being serviced and transfers waiting
for service, regardless of where the request is waiting (drive or controller)
Insight Control performance management uses a set of algorithms to determine SCSI drive status.
In general, the Disk Queue Length is a primary parameter. When the value of the Disk Queue
Length exceeds an acceptable value, the Disk Reads/Sec and Writes/Sec are examined to determine
whether read or write operations are requiring most of the drive throughput. When combined with
Disk Millisec/Read or Write, Performance Management can determine if the number of requests
for the drive is exceeding the capabilities of the drive.
SCSI drive 55