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255Creating volumes
Mirroring across targets, controllers or enclosures
for the attribute stripe-mirror-col-split-trigger-pt that is defined in
the
vxassist defaults file.
If there are multiple subdisks per column, you can choose to mirror each subdisk
individually instead of each column. To mirror at the subdisk level, specify the
layout as stripe-mirror-sd rather than stripe-mirror. To mirror at the
column level, specify the layout as stripe-mirror-col rather than stripe-
mirror.
Mirroring across targets, controllers or enclosures
To create a volume whose mirrored data plexes lie on different controllers (also
known as disk duplexing) or in different enclosures, use the
vxassist command
as described in this section.
In the following command, the attribute mirror=target specifies that volumes
should be mirrored between identical target IDs on different controllers.
# vxassist [-b] [-g diskgroup] make volume length \
layout=layout mirror=target [attributes]
The attribute mirror=ctlr specifies that disks in one mirror should not be on
the same controller as disks in other mirrors within the same volume:
# vxassist [-b] [-g diskgroup] make volume length \
layout=layout mirror=ctlr [attributes]
Note: Both paths of an active/passive array are not considered to be on different
controllers when mirroring across controllers.
The following command creates a mirrored volume with two data plexes in the
disk group, mydg:
# vxassist -b -g mydg make volspec 10g layout=mirror nmirror=2 \
mirror=ctlr ctlr:c2 ctlr:c3
The disks in one data plex are all attached to controller c2, and the disks in the
other data plex are all attached to controller c3. This arrangement ensures
continued availability of the volume should either controller fail.
The attribute
mirror=enclr specifies that disks in one mirror should not be in
the same enclosure as disks in other mirrors within the same volume.
The following command creates a mirrored volume with two data plexes:
# vxassist -b make -g mydg volspec 10g layout=mirror nmirror=2 \
mirror=enclr enclr:enc1 enclr:enc2
The disks in one data plex are all taken from enclosure enc1, and the disks in
the other data plex are all taken from enclosure enc2. This arrangement
ensures continued availability of the volume should either enclosure become
unavailable.