Cloud DevOps Admin Guide

You can use the command cat /proc/meminfo to get the memory details in the linux operating system.
But this gives much more information of memory.
If you need just the memory size , use the below command to get that.


cat /proc/meminfo | awk 'match($1,"MemTotal") == 1 {print $2}'

This gives the memory size in kilobytes(kb).
But I don't know if the format of /proc/meminfo varies among distribution.

 

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.