User`s guide

276 Implementing an Open IBM SAN
You cannot telnet to the Gateway and use the service port at the same time.
When you telnet to the Gateway, the service port on the rear of the unit will stop
its communications. After you end the telnet session, then the service port will
become available again.
4.2.3 Startup sequence
You must start up the SAN Data Gateway and the attached host and target
devices in a specific order. When you add or remove SCSI devices or update
firmware, you must restart. The following procedures describe the situations and
order of procedure when you restart the SAN Data Gateway.
Before you restart the SAN Data Gateway, you must stop all input and output
(I/O) activity between the host and SCSI devices.
1. SCSI devices
Turn on the SCSI devices. You must turn on all SCSI devices attached to the
SAN Data Gateway before you initially turn on or restart the SAN Data
Gateway.
2. SAN Data Gateway
The SAN Data Gateway scans the SCSI buses when it starts. If you add or
remove SCSI devices after the Gateway has started, the Gateway will not
detect the changes. You can invoke an SCSI rescan or restart operation from
either the StorWatch SAN Data Gateway Specialist client or the service
terminal.
3. Fibre Channel host
Before you turn on or restart the hosts that are connected with Fibre Channel
to the SAN Data Gateway, you must wait until the SAN Data Gateway has
finished starting. You will know the Gateway has finished starting when the
ready light on the front panel blinks at frequency intervals of one second.
• Some operating systems provide you with software methods that allow
you to add or remove SCSI devices dynamically after the host has started.
To ensure reliable operation, restart the host.
• If you update SAN Data Gateway firmware, you must restart the Gateway
to use the new firmware. To ensure compatibility between the firmware
features or functions and the host, restart the host.
• If you update SCSI device firmware, the SAN Data Gateway Explorer
application does not display the new firmware version until the SAN Data
Gateway has issued an SCSI inquiry. The SCSI inquiry occurs when the
Gateway rescans the SCSI buses. The SCSI inquiry also occurs when the
StorWatch SAN Data Gateway Specialist client application or the service
terminal rescans the SCSI buses.