Dell PowerVault MD3000 - Manual (Page 95)

Maintaining a Storage Array
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To determine which virtual disks have reservations, run the following
command:
show (allVirtualDisks | virtualDisk
[ virtualDiskName ] | virtualDisks [ virtualDiskName1
... virtualDiskNamen ]) reservations
To clear persistent virtual disk reservations, run the following command:
clear (allVirtualDisks |
virtualDisk[ virtualDiskName ] | virtualDisks
[ virtualDiskName1 " ... " virtualDiskNamen ])
reservations
Synchronizing RAID Controller Module Clocks
To synchronize the clocks on both RAID controller modules in a storage array
with the host clock, run the following command:
set storageArray time
Locating Physical Disks
At times, you might need to locate a specific physical disk. In very large
storage array configurations, this can sometimes be awkward. If you need to
locate a specific physical disk, turn on the indicator LED on the front of the
physical disk. To turn on the indicator LED on a physical disk, run the
following command:
start physicalDisk [ enclosureID,slotID ] blink
To turn off the indicator LED after locating the physical disk, run the
following command:
stop physicalDisk blink
Performance Tuning
Over time, as a storage array exchanges data between the hosts and physical
disks, its performance can degrade. Monitor the performance of a storage
array and make adjustments to the storage array operational settings to
improve performance.