Adaptec AHA-1540CP Betriebsanweisung PDF herunterladen (Seite 17)

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Introduction

Hard disk capacity and software RAID sets

If entire hard disks are to be networked as software RAID sets (RAID 1 or

RAID 5), please ensure the entire capacity of the hard disk is not used but

only the standardized capacity. This means the partition on the hard disk

which is used for the RAID set must have a maximum capacity equal to the

formatted capacity and not the entire physical capacity. If a hard disk in the

RAID set fails during operation, this must be replaced by another disk of

equal or larger capacity. For example, as not all 4 Gbyte hard disks now

have the same physical capacity, they may, for example, be 4135, 4250 or

4315 Mbytes, there may be problems if a similar size or larger disk is used.

Standardized hard disk capacities:

For hard disks the following hard disk capacities are standardized. Only use

this values for partitioning.

The capactity is calculated at the binary system.

Example - three hard disks as software RAID 5 and one replacement hard

disk:

If one of the 3 hard disks in the RAID 5 fails, it can be replaced by a physi-

cally smaller disk. This is possible since the entire hard disk capacity is not

used for the RAID set, but only the standardized capacity.

2 Gbyte hard disk: 2048 Mbyte

4 Gbyte hard disk: 4095 Mbyte

9 Gbyte hard disk: 8680 Mbyte

18 Gbyte hard disk: 17300 Mbyte

physical hard disk capacity

➙

standardized hard disk capacity +

not applicable area

1. hard disk with 4250 Mbyte

➙ Partition with 4095 Mbyte + 155 Mbyte

2. hard disk with 4315 Mbyte

➙ Partition with 4095 Mbyte + 215 Mbyte

3. hard disk with 4250 Mbyte

➙ Partition with 4095 Mbyte + 155 Mbyte

physical hard disk capacity

➙

standardized hard disk capacity +

not applicable area

Replacement hard disk with

4150 Mbyte

➙ Partition with 4095 Mbyte + 55 Mbyte

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Adaptec AHA-1540CP Betriebsanweisung Seite 17