
Chapter 2: RAIDWatch Considerations
rebuild the array, you will also need to replace the failed drive
manually to 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 a certain RAID level. To view logical drives,
select “Existing 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 “Existing Logical Volumes” under the navigation
menu tree.
2.3 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:
♦ If a spare drive exists in the same logical drive, the controller will
automatically mount the spare drive and start rebuilding data in the
background.
♦ Depending on system design, it may be possible to remove a
defective drive and replace it with a new drive without shutting
down the system (hot-swapping). All EonStor subsystems support
drive hot-swapping.
♦ The replacement drive must then be assigned as a new spare drive.
2.4 Operating without Spare Drives
The following are guidelines for disk failure recovery when a spare drive
is not available:
♦ Depending on the design of the system, it may be possible to
remove a defective drive and replace it with a new drive without
Operating with Spare Drives 2-3
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