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change the whole ICP Controller and the channels, IDs, without loosing the data and the

information on a specific disk array.

/HYHO

On this level of hierarchy, the firmware forms the

Array Drives

. This can be:

 Single Disks (one hard disk, some vendors call it JBOD - Just A Bunch Of Drives)

 Chaining Sets (concatenation of several hard disks)

 RAID 0 Array Drives

 RAID 1 Array Drives, RAID 1 Array Drives plus hot fix drive

 RAID 4 Array Drives, RAID 4 Array Drives plus hot fix drive

 RAID 5 Array Drives, RAID 5 Array Drives plus hot fix drive

 RAID 10 Array Drives, RAID 10 Array Drives plus hot fix drive

/HYHO

On the highest level of hierarchy, the firmware forms the

Host Drives

. In the end, only the-

se Host Drives can be accessed by the host operating system of the computer. Drives C, D,

etc. under MS-DOS, Windows NT, NetWare, etc. are always referred to as Host Drives by the

firmware. The firmware automatically transforms each newly installed Logical Drive and

Array Drive into a Host Drive. This Host Drive is then assigned a Host Drive number which

is identical to its Logical Drive or Array Drive number.

The firmware is capable of running several Host Drives of the most various kinds at the sa-

me time. An example for MS-DOS: drive C is a RAID 5 type Host Drive (consisting of 5 hard

disks), drive D is a single hard disk, and drive E is a CD-ROM communicating with RAIDYNE

through corelSCSI and the GDT ASPI manager.

On this level the user may split an existing Array Drive into several Host Drives.

After a capacity expansion of a given Array Drive the added capacity appears as a new Host

Drive on this level. It can be either used as a separate Host Drive, or merged with the first

Host Drive of the Array Drive.

Within GDTSETUP, each level of hierarchy has its own special menu:

/HYHO

Ö Menu: Configure Physical Devices

/HYHO

Ö Menu: Configure Logical Drives

/HYHO

Ö Menu: Configure Array Drives

/HYHO

Ö Menu: Configure Host Drives

Generally, each installation procedure passes through these 4 menus, starting with level 1.

Therefore:

 First initialize the Physical Drives.

 Then configure the Logical Drives.

 Then configure the Array Drives (e.g. Array Drives with RAID 0, 1, 4, 5

and 10).

 Finally, configure the Host Drives.

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