Disk Queue Length (PDpdDiskQueueLength)
Displays the number of requests outstanding on the disk at the time the performance data is collected.
Recommendations
If this parameter consistently has a value greater than 2, you should consider replacing the disk drive and/or the disk controller with faster versions.
Before you upgrade the disk system, you should make that you do not have a memory bottleneck, since excessive paging activity that is caused by insufficient memory can appear as a disk bottleneck. You should make sure that the paging parameters are somewhat low relative to the total disk activity before you decide that you have a disk bottleneck. Refer to the following parameter topics to help identify memory bottlenecks:
- MEMmemCacheFaultsPerSec
- MEMmemPageFaultsPerSec
- MEMmemPagesInputPerSec
- MEMmemPagesPerSec
Thresholds for alarms and warnings
No default thresholds have been set for this parameter. The baselining overview may help you determine appropriate settings for your system.
Default properties
Property | Default value |
|---|---|
BMC PATROL properties | |
Application class | NT_PHYSICAL_DISKS |
Command type | not applicable |
Icon style | graph |
Unit | outstanding requests |
Border range | undefined |
Alarm1 range | undefined |
Alarm2 range | undefined |
Scheduling (poll time) | inherits poll time of collector |
Active at installation | yes |
Parameter type | consumer |
Value set by | PDPhysicalDiskColl |
BMC ProactiveNet Performance Management properties | |
Monitor type | Physical Disk |
Key Performance Indicator | No |
Monitor for abnormalities | No |
Graph by default | No |
Availability | No |
Response time | No |
Normal distribution | Yes |
Statistical | Yes |