HP Surestore Disk Array 12h - And FC60, Advanced User'S Manual, Page: 258 / 466

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Upgrading Controller Cache to 512 Mbytes
Upgrading Controller Cache to 512 Mbytes
Controller cache can be upgraded from the standard 256 Mbytes of cache to 512 Mbytes.
This provides improved I/O performance for write operations. See
Table 58 on page 416 for
cache upgrade kit part numbers.
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The cache upgrade kit must be installed by service-trained personnel only.
Attempting to install the cache upgrade kit without the proper training may
damage the disk array controllers.
Determining What Type of Cache Memory is Installed on the Controllers
If there is currently 256 Mbytes of cache installed on the controllers, you must determine if
this memory is configured as two 128 MB DIMMs, or as a single 256 MB DIMM. This will
influence the number of upgrade kits you must order.
You can determine the cache configuration by checking the Manufacturing Part Number
(MFG P.N.) on the product label on the front of the controller.
1. Remove the controller enclosure front panel.
2. Check the product label on the front of the controller. Depending on the part number,
the cache is configured in one of the following ways:
– MFG P.N. A5278-62006 uses two 128 MB DIMMs. It will be necessary to order two 256
DIMMs for each controller.
– MFG P.N. A5278-62016 uses one 256 MB DIMM. It will be necessary to order one 256
DIMM for each controller.
3. Once you know the cache configuration, refer to Table 32 to determine how many cache
upgrade kits are required.