HP Storage Essentials V5.1 User Guide First Edition (T4283-96026, August 2006)

Storage Essentials 5.1 User Guide 361
• Database - Provides a cache read ahead multiplier of 0 with a segment size of 64 KB.
• Multimedia - Provides a cache read ahead multiplier of 8 with a segment size of 128 KB.
• Custom - Lets you customize the cache read ahead multiplier and the segment size.
NOTE: (HDS only) Under the “Volume Capabilities Tab”, leave the default selection
“<default>” selected and click the “Finish” button. Once the settings have been made, you
see a new volume called a Group Volume in the list of unmapped volumes. Technically this
is not a LUSE yet as it has not been assigned to a port; it is a logical grouping within the
management server. Think of it as a place holder. From this point you can select the new
group volume and assign it to a port. Once the volume has been assigned to a port, the
management server makes the changes to the array and creates the LUSE. See ”Creating
Host Security Groups” on page 368 and ”Rules for Creating Host Security Groups” on
page 363 for information on how to create a LUN.
The HP-EVA specific volume capabilities are the following: default, RAID 0, RAID 1, and
RAID 5.
For information about the volume capability, refer to the documentation accompanying the
storage system.
8. (Engenio only) If you selected the Custom option, do the following:
a. 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. Select the multiplier
that maximizes performance for the way the volume will be utilized.
b. Select a segment size from the drop-down menu.
9. Click Finish.
Deleting a Storage Volume
When you delete a storage volume on an HDS or Symmetrix storage system, the software marks
the deleted volume as hidden in the CIM repository, thus, making it unassigned, instead of being
deleted. The software keeps track of the “deleted volumes.”
Keep in mind the following:
• Some storage vendors require a password to access the storage system. If the same password
is not entered, an authentication error message is displayed. Refer to Discovery > Details to
determine the user account that was used to access the storage system during discovery.
• If you remove volumes from host storage groups that are command devices or are pair volumes
on HDS storage systems, later modification of the pair volumes may be disabled.
To delete a storage volume:
1. Click Tools > Storage Essentials > Provisioning Manager in HP Systems Insight Manager.
2. In the right pane, click the Storage Systems tab.