Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

The allocation behavior of the vxassist command changes with the presence of
SSD devices in a disk group.
Note: If the disk group version is less than 150, the vxassist command does not
honor media type of the device for making allocations.
The vxassist command allows you to specify Hard Disk Drive (HDD) or SSD
devices for allocation using the mediatype attribute. For example, to create a
volume myvol of size 1g on SSD disks in mydg, use the following command:
# vxassist -g mydg make myvol 1g mediatype:ssd
For example, to create a volume myvol of size 1g on HDD disks in mydg, use the
following command:
# vxassist -g mydg make myvol 1g mediatype:hdd
If neither mediatype:hdd nor mediatype:ssd is specified, then mediatype:hdd
is considered as default selection type which means only the HDD devices present
in the disk group are considered for allocation.
If a mix of SSD devices and HDD devices are specified, the allocation is done only
on HDD devices unless mediatype:ssd is explicitly specified. For example:
enclr1 : enclosure having all SSD devices
enclr2 : enclosure having all HDD devices
enclr3 : enclosure having mix of SSD and HDD devices
In the following command, volume myvol of size 1G is allocated on devices from
enclr2 array (only HDD devices):
# vxassist -g mydg make myvol 1G enclr:enclr1 enclr:enclr2
In order to create a volume on SSD devices from enclr1 enclosure, following
command should be used:
# vxassist -g mydg make myvol 1G enclr:enclr1 mediatype:ssd
If enclr3 is only specified, only hdd devices present in enclr3 are considered for
allocation.
In the following two commands, volume myvol of size 1G is allocated on HDD
devices from enclr3 array:
# vxassist -g mydg make myvol 1G enclr:enclr3 mediatype:hdd
# vxasisst -g mydg make myvol 1G enclr:enclr3
307Creating volumes
Creating a volume on specific disks