HP 3PAR Bedienungsanleitung PDF herunterladen (Seite 30)

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:

• I/O queue depth on each HP 3PAR StoreServ Storage HBA model, as follows:

QLogic 1G: 512◦

◦ QLogic 10G: 2048 (HP 3PAR StoreServ 10000 and HP 3PAR StoreServ 7000 systems

only)

• The I/O queues are shared among the connected host 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. If this condition occurs, each host should be throttled so that it

cannot overrun the HP 3PAR StoreServ Storage port's queues when all hosts are delivering

their maximum number of I/O requests.

HP 3PAR Priority Optimization

The HP 3PAR Priority Optimization feature introduced in HP 3PAR OS versions 3.1.2.MU2 is a

more efficient and dynamic solution for managing server workloads and can be utilized as an

alternative to setting host I/O throttles. Using this feature, a storage administrator is able to share

storage resources more effectively by enforcing quality of service limits on the array. No special

settings are needed on the host side to obtain the benefit of Priority Optimization although certain

per target or per adapter throttle settings may need to be adjusted in rare cases. For complete

details of how to use Priority Optimization (Quality of Service) on HP 3PAR arrays, please read

the HP 3PAR Priority Optimization technical white paper available at http://www.hp.com/go/

bsc.

30 Configuring the HP 3PAR StoreServ Storage for iSCSI

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HP 3PAR Bedienungsanleitung Seite 30