Queue Depth

Question 1

Qlogic queue depth is aka

Answer 1

Execution throttle

Question 2

Default queue depth setting in MS 2008 R2 Microsoft storport.sys driver

Answer 2

The default value is 32 (0x20).

Question 3

The max queue depth setting in MS 2008 R2 Microsoft storport.sys driver

Answer 3

Enter a value upto 254 (0xFE).

Question 4

Explain the queue depth

Answer 4

This setting specifies the maximum number of outstanding (SCSI / Fiber Channel) commands that can execute on any single Target port(WWPN). When a Target port’sExecution Throttleis reached, the host computer will not issue any new commands until one of the current commands finishes executing.
Queue depth is the number of I/O operations that can run in parallel on a device

Question 5

The maximum parallel execution of SCSI operations?

Answer 5

64

Question 6

T => P * q * L

Answer 6

T = Target Port Queue Depth
P = Paths connected to the target port
Q = Queue depth
L = number of LUN presented to the host through this port