ServerNet Nomadic Disk User's Guide

Nomadic Disk Manager Interface
ServerNet Nomadic Disk User’s Guide—425485-001
7-20
TAKE Command
UPPATH { -P | -B | -M | -MB | PRIMARY | MIRROR }
specifies that an UP PATHS command be issued instead of the UP VOLUMES
command. Refer to UP Command on page 7-21.
Immediately after ownership is taken, all the Nomadic volumes are in a DOWN
state. The TAKE command normally automatically issues the UP VOLUMES
command.
UPPATH is used only in special circumstances or emergencies.
Considerations
•
If a TAKE command does not contain the SEGMENT option, nor the DATA option,
it works on the current segment. If a current segment has not been set with the
ASSUME command, the last segment defined in the configuration file becomes the
assumed segment. If that segment is a DATA segment, issuing a TAKE command
has the same effect as issuing a TAKE DATA command. If that segment is a SPARE
segment, the TAKE command works only on that segment. Even though SPARE
segments are not directly supported, the code still allows them. Therefore, you
should always issue a TAKE DATA command rather than a simple TAKE command.
•
In a ServerNet Nomadic Disk environment, all data segments must be owned by the
same node. Therefore, whenever a data segment is given away, all data segments
are given away, unless explicit instructions indicate otherwise.
•
In a planned switchover, you should issue the GIVE command on the owning node
before issuing a TAKE command on the destination node. However, a GIVE
command is not strictly necessary and might not always be possible in an emergency
if, for example, the giving node is down. A TAKE command is always necessary,
even if the GIVE command finishes properly.
•
The results of each intermediate step of a TAKE operation are written to the
Nomadic Disk Manager’s outfile. The steps for the TAKE DATA command are:
1. Switch paths to OWNED.
2. UP VOLUMES or UP PATHS, if the UPPATH parameter is used.
Examples
TAKE SEGMENT ONE, ONLY