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Nomadic Disk Manager Interface

ServerNet Nomadic Disk (Release 2) User’s Guide—523968-001

7-16

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 7-17.

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

1 2 ... 131 132 133 134 135 136 137 138 139 140 141 ... 147 148

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