HP StorageWorks Scalable File Share - Manual (Page 299)

configure commands A–5
raid
Optional. Specify the redundancy level that is to be used for the array. The
default value is
ADG
. Valid values are
ADG
,
6
,
5
,
1+0
,
1
, and
0
.
In HP SFS Version 2.2, only ADG (also called RAID6) and RAID5
redundancy are supported. For 500GB disks, only ADG redundancy is
supported.
If the MDS LUNs are mirrored, both of the component LUNs must be
configured with the same type of redundancy.
In any one file system, all OST LUNs must be configured with the same
redundancy type; this does not have to be the same as the redundancy
type configured on the MDS LUNs, although it would be unusual for it to
be different.
In addition, if the storage in an existing file system was configured to have
RAID5 redundancy, you cannot reconfigure the storage to have ADG
redundancy.
stripe_size
Optional. Specify the stripe size (in KB) across the disk group. The default
value is
256
.
In HP SFS Version 2.2, only the 256KB stripe size is supported.
sectors
Optional. Specify the number of sectors per track for the logical drive. The
default value is
32
.
In HP SFS Version 2.2, only 32 sectors per track are supported.
disks_per_group
Optional. Specify the number of physical disks that each disk group is to
contain. The number of disks must be the same in each disk group. The
default value is
11
.
spare_disk_count
Optional. Specify the number of disks to be set aside for use in the event of
disk failure. The default value is
1
.
force
Optional. Use this option to force the
configure array
command to
ignore the status of the array’s cache. The default is
no
.
The
configure array
command performs status checks on the array
before proceeding with the configuration. One of the checks is to
determine the status of the array’s cache. If the cache battery is still
charging, the cache status check can return an error and the
configure
array
command fails. If you set this option to
yes
, the
configure
array
command ignores the error and continues with the configuration.
preferred_server
Specifies the server on which the
configure array
command is to run.
By default, the server chosen to configure the array is automatically
identified based on the server number (that is, whether the server number
is odd or even) and the HBA port number used to connect to the SFS20
array.
rebuild_priority
Specifies the priority that is to be given to an array rebuild operation in
relation to input/output operations. This parameter is used when the array
is being rebuilt (for example, after a disk fails or a disk is replaced).
By default, this parameter is set to
high
.
When low priority is specified, expansion or rebuild takes place only when
the array controller is not busy handling normal I/O requests. This setting
has minimal effect on normal I/O operations. However, there is an
increased risk that data will be lost if another physical drive fails while the
rebuild is in progress. HP does not recommend using low priority on
SFS20 arrays in any configuration.
When medium priority is specified, expansion or rebuild occurs for half of
the time, and normal I/O requests are handled during the rest of the time.