StorCase Technology DE200i-SWU2 - Manual (Page 25)

StorCase Technology Inc. DE200i-SWU2 User's Guide - Rev. A00
18 Appendix B - Factory-Installed Options
Appendix B - Factory-Installed Options
DE200 Ultra2 (LVD) Hot Swap /Repeater Isolator Board
The Ultra2 (LVD) Hot Swap/Repeater Isolator Board (Figure B-1) is an upgrade attachment
for the DE200i-SWU2 receiving frame. This attachment provides a bus-isolating hot swap
feature, and a repeater function as described below.
Hot Swap Function
The Ultra2 (LVD) Hot Swap/Repeater Isolator Board (part number DX1/200-U2/RH) allows
the installation, removal or exchange of Data Express carriers while your computer
system is operating by monitoring and protecting the computer system and other
peripheral devices on the SCSI Bus. The isolator board eliminates the need to shut down
your system when adding or removing a SCSI device by performing two functions:
1. Delays power up/down of the drive until the time period between SCSI bus
cycles. This prevents the interruption of any SCSI bus activity by other devices
on the bus.
2. Prevents drive power sequencing from generating noise on the SCSI bus, thus
preventing data transfer corruption on other devices.
Please note that, whereas UNIX and Apple based systems provide mount/dismount drive
commands, most PC systems do not provide such a feature. When using one of these
operating systems, it may be necessary to reboot the computer after adding or changing
a drive. This reboot activity will force the SCSI host adapter to rescan its SCSI bus for
physically attached drives, and will then be able to access the new or changed drive.
Repeater Function
The DE200 Hot Swap/Repeater Isolator Board also allows the DE200 to be used for Ultra2
(LVD) applications which implement up to 15 SCSI devices. Without this isolator board
installed, the DE200i-SWU2 can only support up to 2-drive Ultra2 (LVD) implementations.
Attaching the Isolator Board
The DE200i-SWU2 may be purchased with the isolator board factory-installed. If the
board has not already been attached to the receiving frame, follow the instructions below
to add the board. Otherwise, proceed to the section "Using the Isolator Board" for usage
instructions.
1. Remove jumpers on J4 Pins 7 & 8, and Pins 9 & 10 from the receiving frame
motherboard (Figure B-2).
NOTE: Save these jumpers! These jumpers are required when the isolator
board is not installed.