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162

Chapter G - GDT User's Manual

G.7 Further Information

- Under SCO UNIX V/386 3.2v2.0, media changes in cache-run devices with exchangeable

media (for example removable hard disks) can only be made with GDTSETUP

(mount/unmount) or a SCSI reset (cold boot).

From version 4.x of SCO UNIX V/386 3.2, this restriction does not exist anymore. A m e-

dia change can be made with the UNIX commands

MOUNT

and

UNMOUNT

. Please

make sure that the removable hard disk keeps its GDTSETUP drive number when

changing the media, otherwise a separate ID/LUN entry is necessary for each single

media (since the drive number depends on the media and not the device containing it).

- SCO UNIX V/386 3.2v2.0 supports a maximum of 4 host drives (entries in GDTSETUP).

For SCO UNIX V/386 3.2v4.x there is no such restriction.

- SCO UNIX V/386 3.2v2.0 supports a maximum of 2 GDT controllers in the system, SCO

UNIX V/386 3.2v4.x and later versions support a maximum of 4.

- The tool

GDTSYNC

in the directory '/etc' carries out a UNIX SYNC command (update

super block) and causes all buffers still present in GDT's cache to be written to the

cache drives. It is advisable to use this tool before shutting down the system.

- When using Direct Access Devices with

exchangeable media

(e.g. removable hard disks), a

media has to be inserted when the system is booted, otherwise the device is not avai l-

able under UNIX.

- "Not Direct Access Devices" (streamer, tapes, CD-ROMs, etc) can be switched on even

after system power up, they will still be recognized by

GDTSCAN

afterwards.

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Adaptec GDT651y Manual do Utilizador Página 162