Dell PowerVault DP600 Bedienungsanleitung PDF herunterladen (Seite 10)

10 Expanding Disk Storage

NOTE: A maximum of eight physical disks within each RAID 5 disk group is

recommended.

NOTE: All disk drives added to a disk group should be the same size. When

combining drives of dissimilar size for RAID 5, the size of the smallest drive will be

used by each disk within that disk group. As a result, using a larger drive wastes its

disk space.

NOTE: It is not required to have the same size of disks in each of your RAID disk

groups. For example, if your internal RAID disk group is made up of four 250GB

drives, you could add an external RAID group made up of five 500GB disk drives.

Figure 2-2. Dissimilar Disks in a RAID Group

Benefits of Hot Spares

For additional protection against a single disk failure, add a global hot spare to

your RAID configuration. The physical disk assigned as a hot spare

automatically replaces the physical disk on which an error has been detected.

The caveat to using a hot spare is that you lose a storage slot within the

system or external storage enclosure that could have been used by a data disk.

RAID 5 configurations protect against "single" disk failures. A hot spare

provides unattended and uninterrupted protection against an additional disk

failure.

There are two types of hot spares that can be allocated: global or dedicated. If

you choose to implement a hot spare, global hot spares are recommended.

Refer to the "Assign and Unassign Global Hot Spare" section of your Dell

OpenManage Server Administrator User's Guide for more information on how

to configure global hot spares.

250GB 250GB 500GB 500GB

wasted space

in RAID group

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Dell PowerVault DP600 Bedienungsanleitung Seite 10