EMC CX500I Configuration Guide - Page 113

Caching, Servers that can access this LUN's Storage Group, Operating system information, Device name

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Planning File Systems and LUNs Table 5-1 Caching. If you want to use caching (entry on page 5-16), you can specify the type of caching you want - read and write, read, or write for this LUN. Generally, write caching improves performance far more than read caching. The ability to specify caching on a LUN basis provides additional flexibility, since you can use caching for only the units that will benefit from it. Read and write caching recommendations follow. Cache Recommendations for Different RAID Types RAID 5 RAID 3 Highly Not allowed Recommended RAID 1 RAID 1/0 RAID 0 Individual Unit Recommended Recommended Recommended Recommended Servers that can access this LUN's Storage Group. For shared switched storage or shared-or-clustered direct storage, enter the name of each server (copied from the LUN and Storage Group worksheet). For unshared direct storage, this entry does not apply. Operating system information: Device name. Enter the operating system device name, if this is important and if you know it. Depending on your operating system, you may not be able to complete this field now. File system, partition, or drive. Write the name of the file system, partition, or drive letter you will create on this LUN. This is the same name you wrote on the application worksheet. On the following line, write any pertinent notes; for example, the file system mount- or graft-point directory pathname (from the root directory). If any of this storage system's LUNs will be shared with another server, and the other server is the primary owner of this LUN, write secondary. (As mentioned earlier, if the storage system will be used by two servers, we suggest you complete one of these worksheets for each server.) Planning Applications, LUNs, and Storage Groups 5-19

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Planning Applications, LUNs, and Storage Groups
5-19
Planning File Systems and LUNs
Caching
. If you want to use caching (entry on page 5-16), you can
specify the type of caching you want — read and write, read, or
write for this LUN. Generally, write caching improves
performance far more than read caching. The ability to specify
caching on a LUN basis provides additional flexibility, since you
can use caching for only the units that will benefit from it. Read
and write caching recommendations follow.
Table 5-1
Cache Recommendations for Different RAID Types
Servers that can access this LUN’s Storage Group
. For shared
switched storage or shared-or-clustered direct storage, enter the
name of each server (copied from the LUN and Storage Group
worksheet). For unshared direct storage, this entry does not
apply.
Operating system information:
Device name
. Enter the
operating system
device name, if this is important and if you
know it. Depending on your operating system, you may not be
able to complete this field now.
File system, partition, or drive
. Write the name of the file system,
partition, or drive letter you will create on this LUN. This is the
same name you wrote on the application worksheet.
On the following line, write any pertinent notes; for example, the
file system mount- or graft-point directory pathname (from the
root directory). If any of this storage system’s LUNs will be
shared with another server, and the other server is the primary
owner of this LUN, write
secondary
. (As mentioned earlier, if the
storage system will be used by two servers, we suggest you
complete one of these worksheets for each server.)
RAID 5
RAID 3
RAID 1
RAID 1/0
RAID 0
Individual Unit
Highly
Recommended
Not allowed
Recommended
Recommended
Recommended
Recommended