Adaptec GDTSETUP Bedienungsanleitung PDF herunterladen (Seite 124)

124

In order to assist the following considerations, we define the term time without redundancy,

TWR

. Set apart the time needed to set up the disk array (state build), the time without re-

dundancy should be kept as short as possible. Let us assume that one of the hard disks of

the RAID 5 disk array we set up with example 1 fails. The disk array is without redundancy.

TWR starts to run. Any superfluous prolongation of the TWR (because you have to get a re-

placement drive, 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 drive should fail. Therefore, new redun-

dancy should be created as soon as possible and in an entirely automated manner. Inte-

grating a Hot Fix drive as an immediately available and auto-replacing drive is the only way

to keep the TWR as short as possible. Only a Hot Fix drive can ensure optimal disk array

security and constant data availability. Of course a Hot Fix drive is not compulsory. If you

control the disk array at regular intervals and immediately replace a defective drive (by

shutting down the system or hot-plugging), you can do without a Hot Fix drive.

&6WDWHVRID5$,'<1('LVN$UUD\

An Array Drive under the RAIDYNE operating system can assume seven different opera-

tional modes:

Idle, Ready, Fail, Build, Rebuild, Expand and Error.

&,GOH6WDWH

This state is characterized by the fact that the redundant information of the disk array has

never been entirely created. The disk array is in this state after its first configuration and

until you quit GDTSETUP. If an error should occur while the array is in the build state, the

array returns to the idle state (exception: if during build mode the dedicated drive of RAID 4

fails, the mode changes to fail).

&%XLOG6WDWH

After the disk array has been configured for the first time, it assumes the build state as soon

as you quit GDTSETUP. While the array is in the build state, redundancy information is cal-

culated and stored to the hard disks of the array.

&5HDG\6WDWH

The disk array is fully operational when in the ready state. All redundant information is pre-

sent, that is, a hard disk can fail without impairing the functionality of the disk array. This is

the normal state of a disk array. The state ready/expand indicates, that the RAID level and/or

capacity are currently migrated/expanded.

&)DLO6WDWH

The disk array changes to the fail state whenever a Logical Drive fails. Redundancy informa-

tion is still present, thus allowing the remaining hard disks to continue working. This state

should be eliminated as soon as possible by replacing the defective hard disk. If a so-called

Hot Fix drive has previously been assigned to a disk array with GDTSETUP, the controller

will automatically replace the defective drive and start the reconstruction of the data and

the redundant information. Therefore, under these circumstances the fail state is only tem-

porary and will be eliminated by the controller itself.

&5HEXLOG6WDWH

The disk array will assume this state after the automatic activation of a Hot Fix drive or af-

ter a manual replacement carried out with GDTSETUP. The data and the redundant infor-

mation are reconstructed and stored to the new drive.

1 2 ... 119 120 121 122 123 124 125 126 127 128 129 ... 217 218

Kommentare zu diesen Handbüchern

Keine Kommentare

Adaptec GDTSETUP Bedienungsanleitung Seite 124

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Software Adaptec GDTSETUP