HP Storage Essentials NAS Manager Software - Manual (Page 396)

Provisioning Manager 364
Modifying the Cache Settings (Engenio and Sun 6130)
IMPORTANT: Depending on your license, Provisioning Manager may not be available. See the
“List of Features” to determine if you have access to Provisioning Manager. The “List of Features” is
accessible from the Documentation Center (Help > Documentation Center in Storage Essentials).
To modify the cache settings:
1. Click the button corresponding to the volume you want to modify.
2. 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.
3. (Optional) Select Read Caching.
When this option is enabled, the host's operations are stored in controller cache memory.
4. (Optional) Select Write Caching.
When this option is selected, data is written to the cache memory of a controller
5. (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 ” Changing the Owner of a Volume (Engenio, CLARiiON and Sun 6130) ” on
page 364 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.
3 Create a Host Security Group. Host Security
Groups define which initiators (HBA ports) have
access to specified storage volumes. They are
associated with a fibre-channel port and contain
a list of HBA port initiators and the volumes they
can see.
” Creating Host Security Groups ” on
page 380 and ” Rules for Creating Host
Security Groups ” on page 374
Table 54 Setting Up Storage Partitioning (continued)
Step Description Where to Find