HP Surestore Disk Array 12h - And FC60, Advanced User'S Manual, Page: 225 / 466

Adding Disk Enclosures to Increase Capacity
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Consider Adding More Than One Disk Enclosure - Because the process of adding
disk enclosures involves backing up data and powering off the disk array, you should
consider adding more than one enclosure to meet your future capacity needs. This will
avoid having to redo the procedure each time you add another disk enclosure. And the
addition of a single enclosure provides limited flexibility for configuring LUNs on the
disk array.
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Avoid Using Split-bus and Full-bus Mode in the Disk Array - To simplify disk array
and LUN management, it recommended that you avoid mixing split-bus and full-bus disk
enclosures in the same disk array.
Step 1. Plan the Expanded Configuration
Your expansion strategy will be dictated by the amount of capacity you are adding to the
disk array. This includes both the number of new enclosures you are adding, and the
number of new disk modules. Careful planning will help ensure that the expansion is
performed successfully.
1. Identify the original disk array configuration by performing the following tasks:
a. Create a detailed diagram of the existing Disk Array FC60 layout.
b. Attach a label to each Fiber Channel cable attached to the disk array, identifying the
host interface and disk array controller port it connects.
c. Identify the disks comprising each LUN on the disk array. Then attach a label to each
disk in the LUN, identifying its LUN number and channel:ID. For example, LUN 0,
4:0. The channel and ID assigned to each disk are a function of the enclosure and slot
the disk is installed in.
d. Identify all global hot spare disks in the disk array. Then attach a label to each global
hot spare disk, identifying the channel:ID of the disk.
Note
A global hot spare disk should not be moved. If you intend to move a hot spare
disk that is not in use, the disk must be removed from the hot spare group. This
will change its role to Unassigned. After the disk has been moved to its new
location, it can again be assigned the role as a global hot spare.