Instruction Manual

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)
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 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
SCSI storage enclosure
The following information is provided for a SCSI storage enclosure.
SCSI Storage Enclosure Status
• Transfers/Sec—The average number of transfers on this SCSI bus each second (the sum of the Disk
Transfers/Sec for all hard drives on this bus).
• MBytes/Sec—The average number of megabytes transferred on this SCSI bus each second (the sum
of the Disk MBytes/Sec for all SCSI drives on this bus).
• SCSI Utilization %—The average SCSI utilization for this SCSI bus, which is primarily dependent on
the MBytes/Sec, and the SCSI protocol negotiated between the controller and each drive on the bus.
The negotiated SCSI protocol is reported in the hard drive inventory. The valid SCSI protocols include:
• SCSI-1-5 MB/s with 8-bit transfers at 5 MHz (5,000,000 bytes/s)
• Fast SCSI-2- 10 MB/s with 8-bit transfers at 10 MHz (10,000,000 bytes/s)
• Fast-Wide SCSI-2- 20 MB/s with 16-bit transfers at 10 MHz
• Ultra SCSI-3- 20 MB/s with 8-bit transfers at 20 MHz
• Wide-Ultra SCSI-3- 40 MB/s with 16-bit transfers at 20 MHz
• Wide Ultra2 SCSI- 80 MB/s with 16-bit transfers at 40 MHz
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