Direct Access Devices - ICP RS Series User Manual

Channel Settings
Termination
The termination for this channel of the ICP Controller can be set to three different states:
ON: The termination of the lower (low byte) and upper data lines (high byte) is enabled
or disabled depending on the occupied SCSI connectors of this channel.
OFF: No lines are terminated
AUTO: All 8/16 data lines are terminated.
ID
Changes the SCSI ID of the SIOP (0-7).
Warning: The SCSI bus termination of The ICP Controller must match the existing SCSI ca-
bling and cable termination. If the ICP Controller represents one end of the SCSI bus its
termination must be ON or AUTO. If you change the termination to OFF, it is very likely that
the SCSI bus is longer stable and the connected devices fail. Due to the different technol-
ogy, these settings cannot be changed with an FC I/O processor (fibre channel).
Rescan ID(s)
This function allows you to rescan one or all IDs of the selected SCSI channel. It displays an
overview of all powered SCSI devices which are currently connected with the SCSI bus.
Warning: If the hard disk contains valid Host Drive or Array Drive information, they will be
deleted when creating a new Logical Drives. All data will be lost.
Hot Plug: Add Disk
With this Hot Plug function you can add a new hard disk while the system is running. Be-
fore starting the Hot Plug procedure, you should prepare the new hard disk and set the
jumpers according to the free SCSI IDs and SCSI bus termination. Thus, pay attention to
the correct termination of the SCSI bus and set the ID of the hard disk to a free address, if
that is not done automatically by your storage subsystem. If you do not know, which IDs are
in use on the selected SCSI channel, you can find this out in the physical configuration
window. Wrong SCSI bus termination and/or SCSI ID conflicts will cause a failure of the
complete SCSI channel. During the Hot Plug procedure firstly enter the ID of the new hard
disk (all free IDs are offered). Secondly, you have to confirm a security request. Thereafter
the SCSI channel is halted. While the channel is halted, you have 45 seconds to plug in the
new hard disk. (Note: Since the operating system will timeout, the channel cannot be
halted longer). If you do not complete the Hot Plug procedure manually, the channel will
automatically start again after 45 seconds. After the successful completion of the Hot Plug,
the new Physical Drive appears in the physical configuration window. Now, you can use it
to build a new Host Drive, replace a failed drive or for the expansion of an existing Array
Drive. You should only use the Hot Plug function with servers and/or subsystems which are
designed and certified for hot plugging of hard disks.
Warning: If the new plugged in hard disk contains valid Host Drive or Array Drive informa-
tion, they will be deleted when creating a new Logical Drives. All data will be lost.
K.4.3 Direct Access Devices
Direct access devices can be initialized and subsequently used for Logical Drives. The ICP
Controller caches the I/Os of these devices. Logical Drives are the components of Array
Drives.
163