480 DS8800 Performance Monitoring and Tuning
Queue depth and the number of command elements in the VIOS
When you connect the DS8000 to an IBM i through the VIOS, consider the following types of
queue depths:
The queue depth per LUN: SCSI command tag queuing in the IBM i operating system
enables up to 32 I/O operations to one LUN at the same time. This queue depth is valid for
either connection with VIOS vscsi or connection with VIOS_NPIV.
If the DS8000 is connected in VIOS vscsi, consider the queue depth 32 per physical disk
(hdisk) in the VIOS. This queue depth indicates the maximum number of I/O requests that
can be outstanding on a physical disk in the VIOS at one time.
The number of command elements per port in a physical adapter in ...