HP Insight Control Performance Management 7.3 User Guide

• Disk Millisec/Write—Average time for each write to complete
• Disk Queue Length—Average number of concurrent requests between the server and the drive
SCSI drive performance based on Disk Queue Length
Smart SCSI Drive Inventory
• Drive Information
Description of the drive, including the size◦
◦ Hard drive model number
◦ Exact 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
SATA Drives
The following information is provided for a SATA drive.
SATA Drive Status
• Disk Read/Sec—Average number of reads from the selected SATA drive each second
• Disk Write/Sec—Average number of writes to the selected SATA drive each second
• Disk Read Mbytes/Sec—Average number of Megabytes of data read from the selected SATA
drive each second
• Disk Write Mbytes/Sec—Average number of Megabytes of data written to the selected SATA
drive each second
• Disk Millisec/Read—Average time required to complete a read operation
• Disk Millisec/Write—Average time required to complete a write operation
• Disk Queue Length—Average number of transfer requests (reads and writes) waiting to be
serviced by the SATA 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 SATA 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 Millisec/Read or Write, performance management can determine if the number of requests
for the drive will exceed the capabilities of the drive.
SATA Drives 57