User`s manual

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Chapter M - GDTSETUP in Detail
with other requests on the operating system. When the copying procedure is completed,
you practically have two identical drives.
(G) Multiple Mirror Drives are possible.
Even if it is not very common to add more than one mirror drive to a master drive, we
would like to point out that this is possible (use GDTSETUP to create multiple mirror
drives).
(H) Acoustical Alarm System - Drive Failure.
If during your operating session a SCSI device belonging to a cache drive of the mirroring
array should fail, or if other problems should arise during the mirroring process, you will be
notified by an acoustic signal from GDT's electronic beeper (beeping at intervals of about 1
second). To switch off the alarm, start the GDTSETUP program. GDTSETUP will indicate the
drive which has caused the problem and will prompt you to take appropriate measures.
These measures aim at unmounting the failed drive (remove missing drives) and at adding a
new mirror drive.
(I) What to Do in Case of Audio Alarm
If GDT's acoustic alarm should start to beep (at regular intervals of about 1 second) while
the computer system is running with a mirror cache drive, a problem with a cache drive be-
longing to a mirroring array has occurred. The computer system and the intact drive remain
fully operational (it was exactly for this security requirement that we have set up a mirror
drive). Still, you should try to find out the cause of failure as soon as possible. To this end,
start the GDTSETUP program (this will also stop the beeping). Select Set up Cache Drives. The
program will ask you to remove the defective cache drive from the configuration of the mi r-
roring array. Do so by choosing the command
Remove missing drive
. Next, you will have to
look for an adequate replacement drive (you might have to install and initialize a new SCSI
device), which can be assigned to the intact cache drive as mirror drive. The drive names
that you have previously assigned now help you in identifying the still intact drive.
M.8 Configuring Host Drives
This main menu option allows you to configure host drives (level of hierarchy 3).