RAID Technology
Although the drives in the disk array can be of different capacities
(for example, 1 GB or 2 GB), they are treated in the disk array
configuration as if they all have the capacity of the smallest disk
drive. Therefore, if you have four drives of 1 GB, 1 GB, 1 GB, and
2 GB grouped in one disk array, the total capacity of the array is
1 GB times 4, or 4 GB (instead of the 5 GB physically available).
Notes:
1. The total capacity of the array without protection would
be 4 GB. With RAID level 5, the usable data capacity
would be 3 GB.
2. When referring to hard-disk-drive capacity, GB means
1 000 000 000 bytes; total user-accessible capacity may vary
depending on operating environment.
Additional Storage Capacity
With the Administration and Monitoring program Remote Monitor,
you can dynamically add capacity to your server by defining
additional arrays and logical drives (when your operating system
supports this). When you use the Remote Monitor, you do not have
to restart the server to create an array.
When you add hard disk drives to your server, you must configure
a new disk array before you can use the drives. You can either
reconfigure the existing disk array to include the capacity offered
with the added drives, or group the added drives into their own
array (see “Creating a Disk Array” on page 91). You also can create
an array with only one drive.
The ServeRAID Configuration Program Screens
When you configure your disk array, or even just view its
configuration, you will be using the IBM ServeRAID configuration
program on the IBM PC ServeRAID Configuration Diskette (also
called the ServeRAID Configuration diskette). The following figure
is a compilation of many of the IBM ServeRAID Controller Disk
Array Configuration (also called the ServeRAID configuration
program) screens. The list that follows the figure gives explanations
of the numbered areas of the figure.
Chapter 3. Configuring the Disk Array 83
To Next Page
Loading...
