7065DS3KBasicConfig.fm Draft Document for Review August 30, 2007 12:59 am
84 IBM System Storage DS3000: Introduction and Implementation Guide
Figure 4-49 Manual Drive Selection - Calculate Capacity
5. After the array is defined, we then create a logical drive, as shown in Figure 4-50.
Logical drive definition requires several parameters:
– Logical drive size
You can either create one large logical drive across the entire array, or you can carve
the array into several smaller logical drives. In our example, we created a logical drive
of 68 GB. The total array capacity is 136 GB - the remaining free capacity can be used
for additional logical drives.
– Logical drive name
Each logical drive must have a unique name. The name will be used in all
management tasks to refer to a particular logical drive. For clarity, the name should
reflect the role of the logical drive.
– Logical drive I/O characteristics
The logical drive I/O access pattern can be very different, depending on the host server
role. For example, file servers use the disk storage in a different way than database
servers. For best performance, it is important to match the logical drive parameters,
such as segment size and cache pre-fetch, to the actual I/O access pattern. Select one
of the predefined options (file server, database server or multimedia), as shown in
Figure 4-50.
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