
Chapter 2: Starting Up
Definition of Terms 2-11
2.6. Definition of Terms
This section describes some of the disk array terms used in this
documentation.
Physical drives. These are the actual drives installed into the
enclosure drive slots. These drives are displayed in the Enclosure
View of different configuration windows.
Spare drives. These are physical drives that serve as backups.
When a drive fails, the spare automatically joins the array and data
reconstruction commences immediately. A Dedicated Spare appears
in the same color as other members of the logical drive it belongs to.
A Global Spare uses the default color (black). Both Dedicated and
Global Spares have an orange cross superimposed on them.
Replacement drives. These are physical drives that are manually
configured into the array to replace failed drives. In the absence of
spare drives, you will need to use replacement drives to replace
defective drives before rebuild takes place. If a spare drive has been
used to rebuild the array, you will also need to replace the failed drive
manually and create another spare in case another drive fails.
Failed drives. These are physical drives that fail due to some type of
error. Failed drives appear with red LED marks on their respective
icons.
Logical drives. Logical drives are the combinations of multiple
physical drives. Combining physical drives into logical drives gives
you a disk array with the protection/performance of a specific RAID
level. To view logical drives, select “Logical Drives” under the
navigation menu tree.
Logical volumes. Volumes are the combinations of several logical
drives. Combining logical drives into logical volumes gives you a
single logical unit with even larger capacity. Logical volumes or their
partitions are mapped to various host LUNs. To view logical volumes,
select “Logical Volumes” under the navigation menu tree.
2.7. Operating with Spare Drives
You can assign spare drives to a particular logical drive to serve as backup
drives. When a drive fails within the logical drive, one of the spares will be
automatically configured into the logical drive, and data reconstruction onto it
will immediately commence.
The following are guidelines for disk failure recovery when a spare drive is
available:
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