Bull ESCALA E250, Use And Maintenance, Page: 101 / 162

Configuring the System
5-21
Connection in Native High Availability Configuration
Notes:
1. These paragraphs deal only with physical connections of High Availability
configurations. Please refer to the Bull ESCALA PowerCluster & HA Solutions
Setup Guide , for additional information.
2. Native High Availability configurations are not supported by RAID controllers.
3. Native High Availability configurations are not supported by ULTRA-2/LVD
controllers; ULTRA/SE controllers must be used instead.
4. The following drawing indicates the use of SE terminating plugs ( S-T ). Notice that
also LVD/SE terminating plugs ( L-T ) can be used; the bus will work anyway in
ULTRA/SE mode, being the controller a ULTRA/SE one.
The following example shows the connection of disk devices in Areas 3 and 2 of two base
units, in a native High Availability configuration.
Two additional SCSI controllers per base unit are needed for this configuration.
In addition, it is assumed that all device areas of both the base units are fully configured.
In particular, Areas 5, 4, 3 and 2 contain hard disk devices, while Area 1 contains two media
devices.
The following steps must be performed to accomplish the connections relevant to this
configuration.
1. Access each base unit from the right side.
2. Make sure the bulkhead to device area connections are done, as indicated in the
following figure.
Legend:
S-T SE terminating plug
JC Jumper cable