Adaptec GDTSETUP Installationshandbuch PDF herunterladen (Seite 69)

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(1) Use preferably Logical Drives of the type disk to build an Array Drive.

Of course, RAID Array Drives can be configured with Logical Drives of the type chain, too,

but the aspects of security should be taken into consideration as well. For regular RAID

Array Drives, type disk Logical Drives are used.

(2) The Logical Drives of an Array Drive should have the same storage capacity.

In order not to waste valuable storage capacity, you should only use Logical Drives that

have the same storage capacity for an Array Drive.

(3) The Hot Fix drive provides the utmost security.

One of the reasons for which

AID Array Drives are used definitely lies with the

edundancy

they provide, that is, the data security you still have even in the event of a hard disk failure,

thus resting assured against loss of data and time. For the purpose of the following consi-

derations, we define the term time without redundancy, TWR

. Set apart the time needed to

set up the Array Drive (state build), the time without redundancy should be kept as short as

possible. Let us assume that one of the hard disks of a RAID 5 Array Drive fails. The Array

Drive is without redundancy. TWR starts to run. Any superfluous prolongation of the TWR

(because you have to get a replacement hard disk, or because you did not realize the failure

immediately since you didn't hear the ICP Controller's alarm signal, or because nobody

checked the file server) increases the risk of data loss which will occur if a second hard disk

should fail. Therefore, new redundancy should be created as soon as possible and in an

entirely automated manner. Integrating a Hot Fix drive as an immediately available and

auto-replacing hard disk is the only way to keep the TWR as short as possible. Only a Hot

Fix drive can ensure optimal Array Drive security and constant data availability. Of course a

Hot Fix drive is not mandatory. If you control the Array Drive at regular intervals and imme-

diately replace a defective hard disk (by shutting down the system or Hot Plug), you can do

without a Hot Fix drive.

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Adaptec GDTSETUP Installationshandbuch Seite 69