HP StorageWorks Command View SDM Installation and User Guide (T1086-96023, February 2005)

Command Line User Interface 143
Command Line User Interface
-J {SingleController |
Secure | Normal |
RestrictedNormal |
HighPerformance}
Set Resiliency Level. This option sets the level of protection offered by
data resiliency. It determines how often the contents of the controller
maps are copied to the disk. Keeping the map information on the disks
protects against controller map loss.
SingleController is used if the array is operating with only one controller.
This suppresses the single controller warning messages that are normally
generated when only one controller is operating.
Secure continually updates the disks at regular intervals. This option
offers both data protection and good performance.
Normal is the standard resilient map processing. This results in higher
performance than Secure, but the risk of map loss is less than the
HighPerformance configuration.
RestrictedNormal has higher performance than Secure, but less than
Normal, but the risk of map loss is less than the HighPerformance and
Normal configuration.
HighPerformance updates the disk maps only during shutdown of the
array. This is the lowest level of data protection, but it offers the highest
level of performance.
-l <FRULocation> <value>
(lower case “L”)
Set the Port Loop ID of the host port to the ID specified by <value>. The
valid range of IDs is 0-125.
<FRULocation> identifies the host port for which the Port Loop ID is being
set. For example, to set the ID for host port 1 on controller 2,
enter M/C2.H1.
-n <value> Set a limit on the number of LUNs that may be created. This number will
be rounded up to the nearest power of two within the device.
-o {on | off | true | false } Set the Optimize Policy on (true) or off (false). The default is on.
The optimization policy manages the movement of data within the array
between RAID 1+0 and RAID 5DP. The distribution of data is intended to
provide optimum performance and should be left enabled in most
situations.
When optimization is enabled, data will be moved from RAID 5DP to
RAID 1+0 when necessary to improve performance. Disabling
optimization will stop the migration of data from RAID 5DP to RAID 1+0.
One environment in which it may be desirable to disable optimization is
when performing large numbers of sequential writes. In this case,
disabling optimization may result in improved performance by leaving
data in RAID 5DP.