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Installing and Configuring the Nomadic Disk

Manager

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

3-10

Nomadic Disk Manager Configuration Statements

Considerations

•

Although spare segments are used with spare disk modules in NonStop K-series

servers, spare disk modules are not currently supported for the ServerNet

Nomadic Disk subsystem; therefore, the SPARE parameter should not be used

with NonStop S-series servers.

•

A segment represents either the internal 46xx disk drives in a pair of I/O

enclosures or a pair of up to eight 455mod8 disk modules containing external 45xx

disk drives:

One set of internal 46xx disk drives (or external 45xx disk drives) is located at

the primary node and contains the primary volumes.

The other set of internal or external disk drives is located at the backup node

and contains the mirror volumes.

•

A segment of internal 46xx disk drives can have from 1 to 16 mirrored volumes; a

segment of external 45xx disk drives can have from 1 to 64 mirrored volumes.

•

The attributes of the segment must have been previously specified by SET PATH

and SET VOL statements. The SET PATH and SET VOL statements modify a

segment template; the ADD SEGMENT statement uses the data in that segment

template. The ADD SEGMENT statement implicitly resets the segment template.

•

All data segments are normally switched between nodes as a group. This feature

can be overridden, but an override should be attempted only in an emergency.

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Hp NonStop G-Series Manuel d'utilisateur Page 44