Extreemly high average disk queue length
Posted on 2016-08-01
I am using a N-Able/N-Central monitoring and on some servers I see the average disk queue length randomly reported in an extremely high number. For example: 4875851.
If i manually monitor the queue length via performance monitor or even capture data in windows perfmon log files I see no data logged that high.
The product vendor (solarwinds) says that the metric is taken directly from WMI readings.
Win32_PerfRawData_PerfDisk_LogicalDisk get AvgDiskQueueLength
Is it possible that WMI is reporting a value that high?
System is Hyper-v 2008r2. Mulitple VM's
Four SAS disks: 15K 6Gb/s (Write-Cache Status Write Back )
Raid level: 5
Raid Card: Adaptec 6805, 512MB RAM
Stripe size: 256KB
Write-cache/mode: write through
I have another similar system with 6 SAS drives in Raid10, getting same WMI type results.