D89-0000-0087 Rev. B00 StorCase Technology, Inc.
DE100/DE200 Ultra2 (LVD) Hot Swap/Repeater Isolator Board
DE100/DE200 ULTRA2 (LVD) HOT
SWAP/ REPEATER ISOLATOR BOARD
(This insert supplements the Data Express
DE100i-SWCU2, DE100i-SWU2, DE100i-SWU2X,
DE200i-SWCU2, and DE200i-SWU2 User's Guides; it provides specific information regarding
the Ultra2 (LVD) Hot Swap/Repeater Isolator Board. Refer to the individual User's Guides for
specific frame and carrier information.)
The Ultra2 (LVD) Hot Swap/Repeater Isolator Board (Figure 1) is an upgrade attachment for
the DE100i-SWCU2, DE100i-SWU2, DE100i-SWU2X, DE200i-SWCU2, and DE200i-SWU2
receiving frames. This attachment provides both a hot swap feature, and a repeater function
as described below.
Hot Swap Function
The DE100/DE200 Hot Swap/Repeater Isolator Board (P/N DX1/200-U2/RH) allows the in-
stallation, 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 being done 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 re-scan its SCSI bus for physically attached
drives, and will then be able to access the new or changed drive.
Without the DE100/DE200 Hot Swap/Repeater Isolator Board installed, Data Express models
DE100i-SWCU2 and DE200i-SWCU2 can only support up to 9-drive Ultra2 (LVD) implementations,
while the DE200i-SWU2 can only support up to 2 drives. However, the DE100i-SWU2X can
support Ultra2 (LVD) applications with up to 15 SCSI devices.
Attaching the Isolator Board
The DE100/DE200 may be purchased with the isolator board factory-installed. If the board
has not already been attached to the Data Express receiving frame, follow the instructions
below to add the board. Otherwise, proceed to the section "Using the Isolator Board" for