Queue Depth (qla2xmaxqdepth)
The Queue Depth parameter specifies the maximum number of SCSI command buffers that an adapter port can allocate. This parameter determines the maximum number of outstanding commands that can execute on any one adapter port.
The default for the Queue Depth parameter is 32, which provides the best performance for most environments. The following factors may require an adjustment to the Queue Depth parameter to obtain the best performance:
Total number of LUNs exposed through the storage array (target) ports
Queue depth of the storage array port
The effects of changing the Queue Depth parameter are most evident when the application workload type is transactional (small block size I/O).
N_Port ID Virtualization
N_Port ID Virtualization (NPIV) is a Fibre Channel facility that allows multiple
N_Port IDs to share a single physical N_Port. N_Port sharing allows multiple Fibre Channel initiators to use a single physical port, easing hardware requirements in SAN design, especially where virtual SANs are used. NPIV is defined by the Technical Committee T11 within the INCITS standards body by the
NPIV virtualizes the Fibre Channel adapter function such that each VM running on a server can share a pool of adapters, and maintain independent access to its own protected storage. This sharing enables administrators to leverage standard SAN management tools and best practices, such as fabric zoning and LUN mapping/masking, and it enables the full use of
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