By default, a volume in disk groups with the FSS attribute set is mirrored across hosts. You can use the vxassist command to create mirrored volume sets spanning across mixed media types, or using a combination of internal disks and external shared disks (i.e. SAN-attached disks).
To create a mirrored volume with HDD and SSD disks
# vxassist -g diskgroup make vol1 maxsize layout=concat init=none
Where diskgroup is the diskgroup name. HDD is selected by default.
# vxassist -g diskgroup mirror vol1 mediatype:ssd
# vxvol -g diskgroup init active vol1
If you have created a mirrored volume on an SSD disk using the init=none option, you can manually add a new mirror for a DCO volume using the following command:
# vxassist -g diskgroup mirror volume-dcl diskname
Where diskgroup is the diskgroup name and diskname is the name of a disk from the host on which the new data mirror was added. Symantec recommends that you specify the name of a disk on which the data mirror was created.
To create a mirrored volume using internal disks and external physically shared disks
# vxassist -g diskgroup make vol1 maxsize layout=concat init=none host:host1
Where diskgroup is the diskgroup name.
# vxassist -g diskgroup mirror vol1 enclr:emc0
# vxvol -g diskgroup init active vol1