HP StorageWorks X1000 Automated Storage Manager user guide (572087-001, June 2009)

Physical storage
NotesDescriptionItem
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 sched-
uled 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 per-
formance, select the stripe size closest to the size
of the files being saved.
RAID stripe size
This value may be modified in order
to match the change rate of the
data in the storage area.
Amount of storage space (as a percentage of
the volume) that is reserved for storing snapshots
of the storage area.
Snapshot storage
space (percentage of
size)
Other storage settings
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.
The percent full value that when reached
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.
Percent full warning
threshold
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.
Sets an enforced quota for the amount of storage
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.
Enforce allocated limit
(quota)
This setting does not apply to
shared folders.
Indicates whether the storage area is hosted on
a mount point or drive letter.
Application server
volume mount type
*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.
Hosting storage for applications and shared folders24