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On the next higher level are the Logical Drives. Logical Drives are introduced to obtain a
full independence of the physical coordinates of a physical device. This is necessary to eas-
ily change the whole ICP Controller and the channels, IDs, without loosing the data and the
information on a specific Array Drive.
/HYHO
On this level of hierarchy, the firmware forms the Array Drives. Depending on the firmware
installed, 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 these
Host Drives can be accessed by the host operating system of the computer. Drives C, D, etc.
under MS-DOS, OS/2, etc. are always referred to as Host Drives by the firmware. The same
applies to NetWare- and UNIX-drives. 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
same time. An example for MS-DOS: drive C is a RAID 5 type Host Drive (consisting of 5
SCSI 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 Device
/HYHO
Ö Menu: Configure Logical Drive
/HYHO
Ö Menu: Configure Array Drive
/HYHO
Ö Menu: Configure Host Drive
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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