RAM disk in AIX
AIX provides 'mkramdisk' command for producing a disk that resides in the RAM for very high I/O intensive applications like database.
Here is a simple set of commands to create a ramdisk and a filesystem on top of it:
1.create a RAM disk specifying the size
# mkramdisk 5G
The system will assign the available RAM disk. Since this is the first one, it will be called as ramdisk0
2.Check for the new disk
# ls -l /dev | grep -i ram
If there isn't sufficient available memory, the mkramdisk command will warn about the same during the creation.
3.Create and mount a filesystem on top of the ram disk
/sbin/helpers/jfs2/mkfs -V jfs2 /dev/ramdiskx
mount -V jfs2 -o log=NULL /dev/ramdiskx /ramdiskx
The new filesystem will now be available like any other FS.
To remove a ram disk, unmount/remove the filesystem and use 'rmramdisk' command to remove the ram disk.
