HP Insight Control Performance Management 7.3 User Guide

◦ Location of the hard drive in its enclosure
◦ Array in which the drive is configured
◦ 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
• Disk Reads/Sec—Average number of reads from the selected SCSI drive each second
• Disk Writes/Sec—Average number of writes to the selected SCSI drive each second
• Disk Read MBytes/Sec—Average number of megabytes read from the selected SCSI drive
each second
• Disk Write MBytes/Sec—Average number of megabytes written to the selected SCSI drive
each second
• Disk Millisec/Read—Average time required to complete a read
• Disk Millisec/Write—Average time required to complete a write
• Disk Queue Length—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 Disk Writes/Sec are examined to
determine whether read or write operations are requiring most of the drive throughput. When
combined with Disk Millisecond/Read or Disk Millisecond/Write, performance management can
determine if the number of requests for the drive is exceeding the capabilities of the drive.
SCSI Drive Inventory
• Drive Information
Description of the drive, including the size◦
◦ Hard drive model number
◦ Size of the drive as seen by the operating system
• Configuration Information
Summary of the drive configuration◦
◦ Name of the Smart Array controller to which it is attached
◦ Location of the hard drive in its enclosure
◦ Array in which the drive is configured
◦ SCSI protocol negotiated for transfers between this drive and the disk controller
SCSI storage enclosure
The following information is provided for a SCSI storage enclosure.
SCSI drive 59