What is an acceptable disk queue length?
10-20ms is average. Over 50ms is bad. For both Current and Avg. Disk Queue Length, the higher the number the more disk operations are waiting.
How do I change disk queue length?
Disk queue length is a measurement of the disk performance. You can’t change it with a reg edit. You’d have to do something to improve the disk subsystem perfomance. I.e., install faster drives, a faster RAID type, faster controller.
What is considered high disk IO?
Symptoms of high disk IO High server load — The average system load exceeds 1 . chkservd notifications — You receive notifications about an offline service or that the system cannot restart a service. Slow hosted websites — Hosted websites may require more than a minute to load.
What is considered high IO?
What would be regarded as high is when I/O wait affects the server’s overall performance. However, anything over 50% or higher should be investigated to ensure no issues are happening onto your server.
What is disk queue length?
Disk Queue Length The disk queue length reports on the number of outstanding operations to a particular volume. Although Windows 2003 allows reporting separate queue length for read and write operations, the current aggregate value is really the one that matters.
Why is my Disk que length 5-10?
Indeed it sounds like your disks cannot keep up with the required I/O. Depending on the amount of spindles you have available, you might have acceptable Disk Que Length, but 5-10 would often be an indication of disk problems or SAN controller cache being flooded.
What is the queue length for exchange transaction log volumes?
In the case of Exchange database transaction log volumes, the queue length is never greater than 1, unless you combine multiple transaction log sets on the same device. This is because transaction logging is a synchronous process, which triggers a new write only after the current write has been completed.
How do I monitor the disk queue?
This can be done by monitoring the Current Disk Queue Length, Avg. Disk Queue Length, % Idle Time, or % Disk Time. The queue length can be quite erratic at times going from 0 to 1000 and back to 0 again in a quick succession, so the Avg. Disk Queue Length is a good choice because it calculates what the queue length might have been on average.