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218 Creating and administering subdisks
Joining subdisks
For example, to split subdisk mydg03-02, with size 2000 megabytes into
subdisks mydg03-02, mydg03-03, mydg03-04 and mydg03-05, each with size
500 megabytes, all in the disk group, mydg, use the following commands:
# vxsd -g mydg -s 1000m split mydg03-02 mydg03-02 mydg03-04
# vxsd -g mydg -s 500m split mydg03-02 mydg03-02 mydg03-03
# vxsd -g mydg -s 500m split mydg03-04 mydg03-04 mydg03-05
Joining subdisks
Joining subdisks combines two or more existing subdisks into one subdisk. To
join subdisks, the subdisks must be contiguous on the same disk. If the selected
subdisks are associated, they must be associated with the same plex, and be
contiguous in that plex. To join several subdisks, use the following command:
# vxsd [-g diskgroup] join subdisk1 subdisk2 ... new_subdisk
For example, to join the contiguous subdisks mydg03-02, mydg03-03, mydg03-
04 and mydg03-05 as subdisk mydg03-02 in the disk group, mydg, use the
following command:
# vxsd -g mydg join mydg03-02 mydg03-03 mydg03-04 mydg03-05 \
mydg03-02
Associating subdisks with plexes
Associating a subdisk with a plex places the amount of disk space defined by the
subdisk at a specific offset within the plex. The entire area that the subdisk fills
must not be occupied by any portion of another subdisk. There are several ways
that subdisks can be associated with plexes, depending on the overall state of
the configuration.
If you have already created all the subdisks needed for a particular plex, to
associate subdisks at plex creation, use the following command:
# vxmake [-g diskgroup] plex plex sd=subdisk,...
For example, to create the plex home-1 and associate subdisks mydg02-01,
mydg02-00, and mydg02-02 with plex home-1, all in the disk group, mydg, use
the following command:
# vxmake -g mydg plex home-1 sd=mydg02-01,mydg02-00,mydg02-02
Subdisks are associated in order starting at offset 0. If you use this type of
command, you do not have to specify the multiple commands needed to create
the plex and then associate each of the subdisks with that plex. In this example,
the subdisks are associated to the plex in the order they are listed (after sd=).
The disk space defined as mydg02-01 is first, mydg02-00 is second, and
mydg02-02 is third. This method of associating subdisks is convenient during
initial configuration.