The AIX mkramdisk command allows system administrators to create memory-resident file systems. The performance benefits of using RAM disk can be astonishing. The unload of a large TSM database was reduced from 40 hours on SAN disks down to 10 minutes using RAM disk.
The configuration of a RAM disk file system is very simple and takes just a few minutes. Once the file system is mounted, it can be used like any other file system. There are three steps involved: creating the RAM disk, making the file system and then mounting the file system.
First, we create the RAM disk, specifying the size we want. Let's create a RAM disk of 4 GB:
# mkramdisk 4GThe system will assign the next available RAM disk. Since this is our first one, it will be assigned the name ramdisk0:
If there isn't sufficient available memory to create the RAM disk you have requested, the mkramdisk command will alert you. Free up some memory or create a smaller size RAM disk. You can use Dynamic LPAR on the HMC or IVM to assign more memory to your partition.# ls -l /dev/ram* brw------- 1 root system 46, 0 Sep 22 08:01 /dev/ramdisk0
We could use the RAM disk /dev/ramdisk0 as a raw logical volume, but here we
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Interested in learning more?
