Ch 3: Installing Optional Devices

Reserve Disk

The capacity of the reserve disk to be mounted must be the same as that of the hard disks used in the disk array.

If you use two disk arrays, note the following at the time of operation. (The disk array configuration shown below is assumed.)

When there are two or more disk arrays at RAID level 1 or 5

The reserve disk serves as a hot spare for either disk array.

Hot spare for hard disks will change the disk array configuration as follows:

•A failure occurs in hard disk A-1 in disk array A.

•A failure occurs in hard disk B-1 in disk array B.

•A failure occurs in hard disk A in disk array A.

As a result of hot spare, the reserve disk is in the same position as for the original configuration, but data disks A-1 and B-1 in the disk array are switched to each other. As can be seen in this example, hard disks comprising a disk array might switch to any position.

It is recommended therefore that you record the hard disk positions each time a failure occurs.

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Hitachi PC VisionBase 8450H/R Server

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Hitachi 8450H/R manual Reserve Disk, When there are two or more disk arrays at RAID level 1 or
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8450H/R specifications

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