System Management Release Notes
4.36 Cluster Compatibility Patch Kits
Workarounds
If excessively frequent connection moves are observed, you can use one of the
following workarounds:
• You can use SCACP or Availability Manager to assign a higher priority to the
circuit, or the port you wish to be used, thus overriding automatic connection
assignment and moving.
Examples of SCACP commands are:
$ MC SCACP
SCACP> SET PORT PNA0 /PRIORITY=2 ! This will cause circuits from local
! CI port PNA0 to be chosen over
! lower priority circuits.
SCACP> SET PORT PEA0 /PRIORITY=2 ! This will cause LAN circuits to be
! chosen over lower priority circuits.
• You can use the SCACP SHOW CHANNEL commands to determine which
channels are being switched into or out of use. Then you can use SCACP to
explicitly exclude a specific channel by assigning it a lower priority value than
the desired channels. For example:
SCACP> SET CHANNEL LARRY /LOCAL=EWB/REMOTE=EWB /PRIORITY=-2
Note that CHANNEL and LAN device priority values in the range of max,
max-1 are considered equivalent; that is, they are treated as if they both had
the maximum priority value. A difference of 2 or more in priority values is
necessary to exclude a channel or LAN device from use.
4.36.5 Multipath Tape Failover Restriction
V7.3-1
While the INITIALIZE command is in progress on a device in a Fibre Channel
multipath tape set, multipath failover to another member of the set is not
supported. If the current path fails while another multipath tape device is being
initialized, retry the INITIALIZE command after the tape device fails over to a
functioning path.
This restriction will be removed in a future release.
4.36.6 No Automatic Failover for SCSI Multipath Medium Changers
V7.3-1
Automatic path switching is not implemented in OpenVMS Alpha Version 7.3-1 or
higher for SCSI medium changers (tape robots) attached to Fibre Channel using a
Fibre-to-SCSI tape bridge. Multiple paths can be configured for such devices, but
the only way to switch from one path to another is to use manual path switching
with the SET DEVICE/SWITCH command.
This restriction will be removed in a future release.
4.37 OpenVMS Galaxy (Alpha Only)
The following sections contain notes pertaining to OpenVMS Galaxy systems.
Note that OpenVMS Galaxy is supported on OpenVMS Alpha systems only.
System Management Release Notes 4–29
