You are connecting a Linux host to an XtremlO array.

When connecting a Linux host to an XtremIO array using QLogic HBAs, the recommended best practice for the queue depth value is 256.This setting ensures that the XtremIO X2 storage arrays handle an optimal number of SCSI commands, including I/O requests, which is crucial for maintaining high performance and efficient data processing1.

References:

The Dell EMC Ready Solutions for Oracle with XtremIO X2 document specifies the LUN queue depth to the recommended value of 256 for the QLogic HBAs used in their virtualized databases server1.

Additional discussions on HBA Queue Depth and host settings for environments utilizing XtremIO can be found in the Dell Community forums2.