CLI Guide

disk, automatically designates it a spare, and starts reconstructing the disk group. A compatible disk
has enough capacity to replace the failed disk and is the same type. If a spare or available compatible
disk is already present, the dynamic spares feature uses that disk to start the reconstruction and the
replacement disk can be used for another purpose.
● disabled or off: The dynamic spares feature is disabled. This is the default.
● enabled or on: The dynamic spares feature is enabled.
emp-poll-rate rate
Optional. Sets the interval at which the storage system will poll each enclosure's Enclosure
Management Processor (EMP) for status changes, from 5 to 3600 seconds. Typically you can use
the default, 5 seconds.
● Increasing the interval might slightly improve processing efficiency, but changes in device status
are communicated less frequently. For example, this increases the amount of time before LEDs
are updated to reflect status changes.
● Decreasing the interval slightly decreases processing efficiency, but changes in device status are
communicated more frequently. For example, this decreases the amount of time before LEDs are
updated to reflect status changes.
fan-failure enabled|disabled|on|off
Optional. Sets whether the cache policy will change from write-back to write-through when a fan
fails.
● disabled or off: The fan failure trigger is disabled. This is the default.
● enabled or on: The fan failure trigger is enabled.
host-cache-control enabled|disabled|on|off
Optional. Sets whether hosts are allowed to use the SCSI MODE SELECT command to change the
storage system's write-back cache setting.
● disabled or off: Host control of caching is disabled. This is the default.
● enabled or on: Host control of caching is enabled.
large-pools enabled|disabled|on|off
Optional. Enables or disables the capability to create a virtual pool larger than 512 TiB on each
controller by limiting the number of user-defined snapshots that can be created in snapshot trees.
● disabled or off: The maximum size for a virtual pool will be 512 TiB. The maximum number of
volumes per snapshot tree will be 255 (base volume plus 254 snapshots). This is the default. You
can disable this setting only if each pool is less than 512 TiB.
● enabled or on: The maximum size for a virtual pool will be 1024 TiB (1 PiB). The maximum
number of volumes per snapshot tree will be 9 (base volume plus 8 snapshots). You can enable
this setting only if no snapshot tree has more than 15 volumes.
Changing the large-pools setting will automatically restart both controllers, during which time
data will be unavailable.
managed-logs enabled|disabled|on|off
Optional. Enables or disables the managed logs feature, which allows log files to be transferred from
the storage system to a log collection system to avoid losing diagnostic data.
● disabled or off: The managed logs feature is disabled. This is the default.
● enabled or on:The managed logs feature is enabled.
missing-lun-response notready|illegal
Optional. Some operating systems do not look beyond LUN 0 if they do not find a LUN 0 or cannot
handle noncontiguous LUNs. This parameter handles these situations by enabling the host drivers
to continue probing for LUNs until they reach the LUN to which they have access. This parameter
controls the SCSI sense data returned for volumes that are not accessible because they don’t exist
or have been hidden through volume mapping (this does not apply to volumes of offline disk groups).
Use the default option, notready, unless the system is used in a VMware environment or a service
technician asks you to change it to work around a problem.
● not ready: Sends a reply that there is a LUN where a gap has been created but that it’s “not
ready.” Sense data returned is sensekey = 2, code = 4, qualifier = 3. This option is the default.
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Alphabetical list of commands