Installation guide

Glossary
G-12 GAM Client v3.00 and WSAM User’s Manual
To use the automatic rebuild feature, you should always maintain a hot spare
drive in your system. When a drive fails, the hot spare will automatically
replace the failed drive and the data will be rebuilt. The system administrator
can disconnect and remove the bad drive and replace it with a new drive. The
administrator can then make this new drive a hot spare.
Stripe Order
The order in which disk drives appear within a drive group. This order must
be maintained to access the data correctly, and is critical to the controller’s
ability to ‘Rebuild’ failed drives.
Stripe Size
The stripe size is defined as the size, in kilobytes (1024 bytes) of a single I/O
operation. A stripe of data (data residing in actual physical disk sectors,
which are logically ordered first to last) is divided over all drive group disks.
Stripe Width
The number of striped drives within a drive group.
Striping
Refers to the storing of a sequential block of incoming data across multiple
drives in a group. For example, if there are 3 drives in a group, the data will
be separated into blocks and block 1 of the data will be stored on drive 1,
block 2 on drive 2, block 3 on drive 3, block 4 on drive 1, block 5 on drive 2
and so on. This storage method increases the disk system throughput by
ensuring a balanced load among all drives.
System Drive Affinity
See “LUN Mapping” .
System Drives
See “Logical Drives”.