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LUNs

LUNs are created from a RAID group. The RAID type for a RAID group will be assigned when the

first LUN is bound on the RAID group. LUNs can be bound in many different ways on a Dell/EMC

CX Series. For maximum availability all LUNs should be bound with protected RAID, such as

RAID 1/0, or RAID 5. A number of hot spares should also be bound (see hot spares section).

LUN creation settings

Table 2 lists the recommended settings for creating LUNs.

Table 2. LUN creation settings

Set Default setting Notes

Bind a LUN

RAID type RAID 5,

RAID 3,

RAID 1 or

RAID 1/0

RAID 5 Refer to the “Application section.

RAID 5 is considered the best

cost/performance balance for protected

RAID.

RAID Group ID Choose any 1 Choose the RAID Group ID you wish to

put this LUN into. If none exists, click

on new.

LUN ID See note Next lowest

available

Try to use an even and odd numbering

system to reflect the default owner: For

example, use even for SPA and odd for

SP B.

No Initial Verify Default No (box is blank) Do not send data to the LUN until the

background verify operation is

complete.

Rebuild priority Default ASAP

Verify priority Default ASAP

Default owner Auto Either SP A or SP

B depending on the

LUN allocation to

each

Alignment offset See note 0 The alignment offset is operating

system (OS) dependent. Windows: 63

For other OSs or use with replication

software, use the default and see the

section directly below this table for

specific recommendations.

Read and write cache Default Enabled

Enable auto assign Default No (box blank)

LUN size See note 1 GB LUN size must be compatible with the

operating system.

Number of LUNs to bind See note 1 When adding LUNs to an existing

system. select 1.

For Windows systems:

If you plan to use replication software (SnapView, SAN Copy™ or MirrorView™) with a LUN, use

the default offset and align using diskpar. The white paper EMC Dell/EMC CX Series Best

Practices for Fibre Channel Storage has more details.

Dell/EMC CX Series Initial Configuration

Best Practices Planning 9

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 32 33

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