Hp StorageWorks XP10000 Disk Array Bedienungsanleitung PDF herunterladen (Seite 22)

Figure 3 LU path conﬁguration in iSCSI environments

Use LUN Manager to deﬁne paths between a single server host and multiple LUs. In Figure 3,bothhosts

in the hg-lnx iSCSI target can access the three LUs.

Use LUN Manager to deﬁne paths between multiple server hosts and a single LU. In Figure 3,theLU

identiﬁed by CU-LDEV number 00:00 is accessible from both hosts belonging to the hg-lnx iSCSI target.

In Figure 3, LUs associated with the hg-lnx iSCSI target are addressed by numbers 0 to 2. The LU's

addressnumberisreferredtoasalogical unit number (LUN). When Continuous Access XP and other

optional programs manipulate LUs, the programs use LUNs to specify the LUs to be manipulated.

You can add, change, and delete LU paths when the system is operating. For example, if you add new

disks or server hosts to the array, you can add new LU paths. If you replace an existing server host, you

can delete LU paths corresponding to the host before replacing the host. You do not need to restart the

system when you use LUN Manager to add, change, and delete LU paths.

If a hardware failure (such as a CHA failure) occurs, some LU paths might be disabled and some I/O

operations might be stopped. To avoid this situation, the system administrator can deﬁne alternate LU

paths. If one LU path fails, the alternate path takes over the host I/O.

For more information, see:

•Deﬁning LU paths

• Changing or viewing LU path settings

Overview of LUN Manager

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Hp StorageWorks XP10000 Disk Array Bedienungsanleitung Seite 22