SCSI drive 27
SCSI drive
The following information is provided for a SCSI drive.
SCSI Drive Status
• Disk Reads/Sec—The average number of reads from the selected SCSI drive each second
• Disk Writes/Sec—The average number of writes to the selected SCSI drive each second
• Disk Read MBytes/Sec—The average number of megabytes read from the selected SCSI drive each second
• Disk Write MBytes/Sec—The average number of megabytes written to the selected SCSI drive each second
• Disk Millisec/Read—The average time required to complete a read
• 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)
PMP 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, PMP can determine if the number of requests for
the drive is exceeding the capabilities of the drive.
SCSI Drive Inventory
• Drive Information
• Displays a description of the drive, including the size
• Displays the hard drive model number
• Displays the exact size of the drive as seen by the operating system
• 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 SCSI protocol negotiated for transfers between this drive and the disk controller
