NOTE:
You c an change the user or administrator account password separately, or change both at
thesametime.
NOTE:
The password can also be changed from the VLS CLI. S ee CLI Management commands.
Managing high availability
Arra y dual pathing
The VLS300 supports dual pathing to the disk arrays, which provides path balan cing and transparent path
failover on the VLS300. Having followed the setup recommendations in the HP StorageWorks 300 virtual
tape librarie
s solutions guide and the installation instructions in this guide, each node on the VLS300 is
connected to
two fabrics/zones which are each c onnected to the external arrays by two or more paths.
This assures that the gateway can establish t wo paths per LUN, each path on a separate fabric/zone.
Load balancing
For load balancing, half of the data transfer (from a specific node through a fabric to the external array)
is conducted over one path; half over a second fabric, hence a nother path. The paths a re selected as
follows: Once configured, the d evice recognizes all paths to ea ch node on the device. From all p otential
preferred paths and all potential secondary paths (see Step 3) , the array assigns one preferred path and
one second ary path.
NOTE:
During each reboot the device is re-analyzed and the preferred and secondary paths are reassigned.
To view the preferred path for each LUN in the Storage LUN D etails:
1. In Command View VLS, select the System tab.
2. Select Storage LUNs in the navigation tree.
3. Select the View button for either All LUNs or the LUNs in the desired <Storage Pool #> (Figure 55).
Summary information displays at the top of the list. Preferred and secondary paths are listed a fter
the summar y information in the Storage LUN Details Per Node sections.
NOTE:
It may take several minutes to display this information if there are many LUNs.
88
Management
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