Dell PowerVault MD3420 - Manual (Page 51)

• Changing the RAID level of a disk group
The lowest priority rate favors system performance, but the modification operation takes longer. The
highest priority rate favors the modification operation, but the system performance might be degraded.
The set virtualDisk command enables you to define the modification priority for a virtual disk. The
following syntax is the general form of the command:
set (allVirtualDisks | virtualDisk
[virtualDiskName] | virtualDisks [virtualDiskName1
... virtualDiskNamen] | virtualDisk <wwid> |
accessVirtualDisk) modificationPriority=(highest |
high | medium | low | lowest)
The following example shows how to use this command to set the modification priority for virtual disks
named Engineering 1 and Engineering 2:
client>smcli 123.45.67.89 -c "set virtualDisks
[\"Engineering_1\" \"Engineering_2\"]
modificationPriority=lowest;"
The modification rate is set to lowest so that system performance is not significantly reduced by
modification operations.
Assigning Global Hot Spares
Hot spare physical disks can replace any failed physical disk in the storage array. The hot spare must be
the same type of physical disk as the physical disk that failed and must have capacity greater than or
equal to any physical disk that can fail. If a hot spare is smaller than a failed physical disk, the hot spare
cannot be used to rebuild the data from the failed physical disk. Hot spares are available only for RAID
levels 1 or 5.
You can assign or unassign global hot spares by using the set physicalDisk command. To use this
command, you must perform these steps:
1. Identify the location of the physical disks by enclosure ID and slot ID.
2. Set the hotSpare parameter to TRUE to enable the hot spare or FALSE to disable an existing hot
spare.
The following syntax is the general form of the command:
set (physicalDisk [enclosureID,slotID] |
physicalDisks [enclosureID0,slotID0 ...
enclosureIDn,slotIDn] hotSpare=(TRUE | FALSE)
The following example shows how to use this command to set hot spare physical disks:
client>smcli 123.45.67.89 -c "set physicalDisks
[0,2 0,3] hotSpare=TRUE;"
Enter the enclosure ID and slot ID of each physical disk that you want to use. You must put brackets ([ ])
around the list. Separate the enclosure ID and slot ID of a physical disk by a comma. Separate each
enclosure ID and slot ID pair by a space.
Selecting The Event Levels For Alert Notifications
The MD storage management software has four event levels: Critical, Informational, Warning, and Debug.
You can configure the MD storage management software to send alert notifications for all of these event
levels or only for certain event levels.
A background task called the persistent monitor runs independently of the MD storage management
software and monitors the occurrence of events on all of the managed storage arrays. The persistent
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