This section explains how to create a volume on Solid State Disk (SSD) device.
You must upgrade the disk group to version 150 for SSD support. To upgrade the disk group, use the following command:
# vxdg upgrade diskgroup
where diskgroup
is the name of the disk group to which the disk belongs.
The allocation behavior of vxassist changes with presence of SSD devices in a disk group.
Note: |
If the disk group version is less than 150, vxassist will 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
In order to allocate a volume on SSD devices from enclr3 enclosure, following command should be used:
# vxassist -g mydg make myvol 1G enclr:enclr3 mediatype:ssd
The allocation fails, if the command is specified in one of the following two ways:
# vxassist -g mydg make myvol 1G enclr:enclr1 mediatype:hdd
In the above case, volume myvol
cannot be created as there are no HDD devices in enclr1
enclosure.
# vxassist -g mydg make myvol 1G enclr:enclr2 mediatype:ssd
In the above case, volume myvol cannot be created as there are no SSD devices in enclr2
enclosure.