HP X1600 - StorageWorks Network Storage System 5.4TB SAS Model NAS Server User Manual page 24

Physical storage
Item Description
Hot spare required 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.
Minimum number of The minimum number of physical disks that the
physical disks 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.
Assigned logical disk 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 sched-
uled tasks for the storage wizard.
RAID stripe size 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 per-
formance, select the stripe size closest to the size
of the files being saved.
Snapshot storage Amount of storage space (as a percentage of
space (percentage of the volume) that is reserved for storing snapshots
size) of the storage area.
Other storage settings
Percent full warning The percent full value that when reached
threshold changes the storage status to Warning and is-
sues a warning alert. The warning indicates that
storage use has surpassed the percentage full
value. For example, if you enter 75%, you see
a warning (yellow asterisk) in the content pane
when storage is at 75 percent full.
Enforce allocated limit Sets an enforced quota for the amount of storage
(quota) available to a shared folder or local storage
application. When the storage space allocated
to a component is full, no further data can be
saved to this component.
Application server Indicates whether the storage area is hosted on
volume mount type a mount point or drive letter.
*After you have allocated and configured storage for an application component, user-defined application,
or shared folder using a wizard, you can change the allocated space size, change the percent full warning
threshold, and change the enforced allocated limit (shared folders and local storage applications). However,
you cannot change the RAID level, RAID stripe size, Hot Spares, or Physical Disk Type.
24 Hosting storage for applications and shared folders
Notes
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. *
For better performance, increase
the minimum number of physical
disks
ASM provides the following values:
8 KB, 16 KB, 32KB, 64 KB, 128
KB, and 256 KB.*
This value may be modified in order
to match the change rate of the
data in the storage area.
The percent full warning threshold
is set by default to 80%. Percent full
warning threshold values are ASM-
specific; percent full warning
threshold values selected in the
Quota Management MMC snap-in
are not adopted by ASM. All other
Quota Management MMC snap-in
settings are adopted by ASM. See
Setting a percent full warning
threshold on page 26.
This item is available for shared
folders and local storage compon-
ent. See Enforcing an allocated
storage limit for shared folders and
local storage applica-
tions on page 27.
This setting does not apply to
shared folders.