VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

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Creating and Administering Plexes

Introduction

This chapter describes how to create and maintain plexes. Plexes are logical groupings of

subdisks that create an area of disk space independent of physical disk size or other

restrictions. Replication (mirroring) of disk data is set up by creating multiple data plexes

for asingle volume. Eachdata plex in a mirrored volume contains anidentical copy ofthe

volume data. Because each data plex must reside on different disks from the other plexes,

the replication provided by mirroring prevents data loss in the event of a single-point

disk-subsystem failure. Multiple data plexes also provide increased data integrity and

reliability.

Note Most VxVM commands require superuser or equivalent privileges.

Creating Plexes

Note Plexes are created automatically if you use the vxassist command or the

VERITAS Enterprise Administrator(VEA) tocreatevolumes. Formoreinformation,

see “Creating a Volume” on page 161.

Use the vxmake command to create VxVM objects, such as plexes. When creating a plex,

identify the subdisks that are to be associated with it:

To create a plex from existing subdisks, use the following command:

# vxmake [-g diskgroup] plex plex sd=subdisk1[,subdisk2,...]

For example, to create aconcatenated plex named vol01-02 using two existing subdisks

named disk02-01 and disk02-02, use the following command:

# vxmake plex vol01-02 sd=disk02-01,disk02-02