HP StorageWorks All-in-One Storage Manager user guide (452695-004, November 2008)

Table 5 provides a brief description of the items you can modify:
Table 5 Advanced Storage Properties items
Physical storage
NotesDescriptionItem
You are prevented from setting the
size below 15 MB.
After the allocated storage space is
full (100 percent used), no further
data can be stored to the space
until you increase the size using the
Allocate Space Wizard. The only
exception is for shared folders and
local storage applications without
an enforced allocated limit. If there
is unused storage space on the
logical disk where a component
without an enforced allocated limit
resides, data can be written to the
component until the logical disk is
full.
The amount of storage that ASM allocates to the
application component, user-defined application,
or shared folder you are configuring.
Size
You are able to choose SAS, (Serial
Attached SCSI) SATA, (Serial
Advanced Technology Attachment)
or SCSI (Small Computer System
Interface) for a physical disk type,
depending on your hardware.*
Type of physical disk to add for the hot spare.Physical disk type
For more information about RAID
levels, see Customizing RAID
levels on page 24.*
Hard drive formatting that provides different
levels of performance, capacity, and data
protection.
RAID level
A hot spare is assigned at the array
level. A LUN that does not require
a hot spare may be assigned one
anyway if another LUN on the same
array requires a hot spare. *
A hot spare is a hard drive reserved as a spare
for storage space configured as RAID 1, 1+0,
5, or 6. A hot spare automatically replaces a
hard drive when it fails. When the failed hard
drive is replaced, its replacement becomes the
new hot spare.
Hot spare required
For better performance, increase
the minimum number of physical
disks
The minimum number of physical disks that the
allocated storage will be spread across. Storage
may be provisioned across more disks, but this
setting determines the minimum number of disks
reserved for the allocated storage.
Minimum number of
physical disks
The storage area can be assigned to an existing
logical disk, or it can be assigned a new disk,
which is created upon completion of the
scheduled tasks for the storage wizard.
Assigned logical disk
ASM provides the following values:
8 KB, 16 KB, 32KB, 64 KB, 128
KB, and 256 KB.*
The number of bytes or kilobytes of data in each
RAID stripe (block of data). The RAID stripe size
selected affects performance. For the best
performance, select the stripe size closest to the
size of the files being saved.
RAID stripe size
All-in-One Storage Manager 23