3Com VCX V7000 Maintenance Manual page 297

installed and if so, how to revert to the previous version. This operation
must be performed on all VCX servers.
The examples in this procedure use the assumption that upgrading from
version 7.0 to 7.1 changed the operating system version from 4.2.1 to
5.1.3.
1 Log in as root.
2 To determine which operating system versions are available, enter this
command:
vcx-os-query
The output from this command appears:
OS Version
A 4.2.1 /dev/hda2
B 5.1.3 /dev/hda3
The operating system versions that you see may vary from the example
shown.
The order of the A and B versions may be reversed depending on the
upgrade history of the system.
When you are downgrading, use the earlier of the two operating system
versions in this command:
vcx-os-switch 4.2.1
To confirm that you have selected the operating system version that you
want, repeat the
"selected" appears in the Status column for the version that you want.
Example:
OS Version
A 4.2.1 /dev/hda2
B 5.1.3 /dev/hda3
Reboot the Server
Reboot the system using this command:
reboot
When the system reboots, it starts VCX 7.0 services.
Partition
/A
/B
command. Verify that the word
vcx-os-query
Partition
/A
/B
Downgrading from 7.1 to 7.0
Label
active
Label
selected
active
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Status
Status