HP Storage Essentials NAS Manager Software - Manual (Page 357)

Storage Essentials 5.00.01 User Guide 327
those volumes you delete are not being used. See ” Deleting a Storage Volume ” on page 327
for more information.
• If you do not see a storage pool, verify that you have obtained all element details from the
storage system. See ” Step 1 - Discover Switches ” on page 31 for more information.
6. Click Next.
7. Select a volume capability. The volume capabilities listed depend on the type of storage system.
For example, if an EMC Symmetrix storage system is selected, Pool default settings are
displayed in the field. If an Engenio storage system is selected, the following is displayed.
• - Provides the default cache read ahead multiplier and the default segment size
for the storage system.
• File System (Typical) - Provides a cache read ahead multiplier of 1 with a segment size of
64 KB.
• 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
“” 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 Table on
page 334 and Table on page 329 for information on how to create a LUN.
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: