HP StorageWorks Fabric OS 6.1.1 administrator guide (5697-0235, December 2009)

Fabric OS 6.1.x administrator guide 307
NOTE: QoS can be used for device pairs that exist within the same fabric only. QoS priority information
is not passed over EX_ or VEX_Ports and should not be used for devices in separate fabrics.
If a QoS zone name prefix is specified in an LSAN zone (a zone beginning with prefix LSAN_), the QoS
tag is ignored. Only the first prefix in a zone name is recognized. For example, a zone with the name
LSAN_QOSH_zone1 is recognized as an LSAN zone and not as QoS zone.
For example, Figure 35 shows a fabric with two hosts (H1, H2) and three targets (S1, S2, S3). The traffic
prioritization is:
• Traffic between H1 and S1 is high priority.
• Traffic between H1 and S3 and between H2 and S3 is low priority.
• All other traffic is medium priority, which is the default.
Figure 35 QoS traffic prioritization
For this fabric, you could set up the following QoS zones:
• QOSH_Zone1 Members: H1, S1
• QOSL_Zone3 Members: H1, H2, S3
7
12
3
14
15
16
8
13
Domain 1 Domain 3
Domain 4
Domain 2
H1
19
S3
S2
S1
H2
= High priority
= Medium priority
= Low priority