Managing storage pools – HP Storage Essentials NAS Manager Software User Manual

Page 385

Storage Essentials 5.1 User Guide 353

Click the

button corresponding to the volume you want to modify.

Type the cache read ahead multiplier (0 to 65535 bytes) in the Cache read-ahead multiplier

field.
A cache read ahead multiplier copies additional data blocks into the cache while it is reading

and copying host-requested data blocks from disk to cache. To disable this option, type 0.

(Optional) Select Read Caching.
When this option is enabled, the host's operations are stored in controller cache memory.

(Optional) Select Write Caching.
When this option is selected, data is written to the cache memory of a controller

(Optional) Select Write Caching with Mirroring.
Use this option to preserve data if a controller or the cache fails. When this option is enabled,

the data is written to two redundant controllers of the same cache size. This configuration

provides redundancy in case a controller fails. One controller performs uncompleted write

operations when the other controller fails.

NOTE:

See ”

page 353 for information about changing the owner assigned to the volume.

Changing the Owner of a Volume (Engenio, CLARiiON and Sun 6130)

When a volume is created, the management server automatically assigns a controller to be the

owner of the volume. You can change the owning controller if you want to use a different one for

LUN masking.

NOTE:

If the owner becomes unreachable as a result of a network failure or the owner itself fails,

the other controller in the pair automatically becomes the owner of the volume.

To change the owner:

Click the

button corresponding to the volume you want to modify.

Select the owner for the volume from the Current Owner drop-down menu.

Click OK.

Managing Storage Pools

This section describes the following:

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This manual is related to the following products: