EMC CX500I Configuration Guide - Page 110

Port ALPA ID., Memory Mbytes

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Planning File Systems and LUNs Completing the LUN Details Worksheet Complete the header portion of the worksheet for each storage system as described next. Copy the blank worksheet as needed. Storage-System Entries Storage-system installation type: specify Unshared Direct, Shared-or-Clustered Direct, or Shared Switched. SP information: IP address or hostname. The IP address is required for communication with the SP. You don't need to complete it now, but you will need it when the storage system is installed so that you can set up communication with the SP. Port ALPA ID. For shared storage (switches), the SP ALPA ID is ignored for all except HP/UX servers. For unshared storage, each SP connected to a server must have a unique SP Port ALPA ID; for example, for two storage systems, use IDs 0, 1, 2, and 3. The SP Port ALPA ID, like the IP address, is generally set at installation. Memory (Mbytes). Each CX300 has a minimum of 1 Gbyte and maximum of 2 Gbytes of memory. Each CX500/CX500i SP has a minimum of 2 Gbytes and maximum of 4 Gbytes of memory. Each CX700 SP has a minimum of 4 Gbytes and maximum of 8 Gbytes of memory. Caching. You can use SP memory for read/write caching or RAID 3. (We do not recommend using both caching and RAID 3 in the same storage system.) You can use different cache settings for different times of day. For example, for user I/O during the day, use more write cache; for sequential batch jobs at night, use more read cache. You enable caching for specific LUNs - allowing you to tailor your cache resources according to priority. If you choose caching, check the box and continue to the next cache item; for RAID 3, skip to entry RAID 3. Read cache percentage. If you want a read cache, generally it should be about one third (33%) of the total available cache memory. Write cache percentage. Generally, the write cache should be two thirds (67%) of the total available cache memory. Cache page size. This applies to both read and write caches. It can be 2, 4, 8, or 16 Kbytes. As a general guideline, we suggest 8 Kbytes. The ideal cache page size depends on the operating system and application. 5-16 EMC CLARiiON CX300, CX500, CX500i, and CX700 Storage Systems Configuration Planning Guide

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5-16
EMC CLARiiON CX300, CX500, CX500i, and CX700 Storage Systems Configuration Planning Guide
Planning File Systems and LUNs
Completing the LUN Details Worksheet
Complete the header portion of the worksheet for each storage
system as described next. Copy the blank worksheet as needed.
Storage-System Entries
Storage-system installation type:
specify Unshared Direct,
Shared-or-Clustered Direct, or Shared Switched.
SP information: IP address or hostname.
The IP address is
required for communication with the SP. You don’t need to
complete it now, but you will need it when the storage system is
installed so that you can set up communication with the SP.
Port ALPA ID.
For shared storage (switches), the SP ALPA ID is
ignored for all except HP/UX servers. For unshared storage, each
SP connected to a server must have a unique SP Port ALPA ID; for
example, for two storage systems, use IDs 0, 1, 2, and 3. The SP
Port ALPA ID, like the IP address, is generally set at installation.
Memory (Mbytes)
. Each CX300 has a minimum of 1 Gbyte and
maximum of 2 Gbytes of memory. Each CX500/CX500i SP has a
minimum of 2 Gbytes and maximum of 4 Gbytes of memory.
Each CX700 SP has a minimum of 4 Gbytes and maximum of 8
Gbytes of memory.
Caching.
You can use SP memory for read/write caching or
RAID 3. (We do not recommend using both caching and RAID 3
in the same storage system.) You can use different cache settings
for different times of day. For example, for user I/O during the
day, use more write cache; for sequential batch jobs at night, use
more read cache. You enable caching for specific LUNs —
allowing you to tailor your cache resources according to priority.
If you choose caching, check the box and continue to the next
cache item; for RAID 3, skip to entry
RAID 3
.
Read cache percentage.
If you want a read cache, generally it
should be about one third (33%) of the total available cache
memory.
Write cache percentage.
Generally, the write cache should be two
thirds (67%) of the total available cache memory.
Cache page size.
This applies to both read and write caches. It can
be 2, 4, 8, or 16 Kbytes.
As a general guideline, we suggest 8 Kbytes. The ideal cache page
size depends on the operating system and application.