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Target Port Limits and Specifications
To avoid overwhelming a target port and ensure continuous I/O operations, observe the following
limitations on a target port:
• Maximum of 64 host server ports per HP 3PAR StoreServ Storage port, with a maximum total
of 1,024 host server ports per HP 3PAR StoreServ Storage.
• I/O queue depth on each HP 3PAR StoreServ Storage HBA model, as follows:
◦ QLogic 2G: 497
◦ LSI 2G: 510
◦ Emulex 4G: 959
◦ HP 3PAR HBA 4G: 1638
◦ HP 3PAR HBA 8G: 3276 (HP 3PAR StoreServ 10000 and HP 3PAR StoreServ 7000
systems only)
• The I/O queues are shared among the connected host server HBA ports on a first-come,
first-served basis.
• When all queues are in use and a host HBA port tries to initiate I/O, it receives a target queue
full response from the HP 3PAR StoreServ Storage port. This condition can result in erratic I/O
performance on each host server. If this condition occurs, each host server should be throttled
so that it cannot overrun the HP 3PAR StoreServ Storage port's queues when all host servers
are delivering their maximum number of I/O requests.
NOTE: When host server ports can access multiple targets on fabric zones, the assigned
target number assigned by the host driver for each discovered target can change when the
host server is booted and some targets are not present in the zone. This situation may change
the device node access point for devices during a host server reboot. This issue can occur
with any fabric-connected storage, and is not specific to the HP 3PAR StoreServ Storage.
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