size = the amount of RAM (m for megabytes)

/mnt/ram = the mount location of the ram disk (change to the path you want it mounted to)

mount -t tmpfs -o size=4096m tmpfs /mnt/ram/
 

Example test in an old server:

You can see that when reading if you don't specify bs1=M the read speeds are several times slower (eg. 450MB/s vs 2.1GB/s)

mount -t tmpfs -o size=4096m tmpfs /mnt/ram/^C
root@testserver:~# dd if=/dev/zero of=/mnt/ram/testhere bs=1M count=3000
3000+0 records in
3000+0 records out
3145728000 bytes (3.1 GB, 2.9 GiB) copied, 2.51162 s, 1.3 GB/s
root@testserver:~# dd if=/dev/mnt/ram^C
root@testserver:~# dd if=/mnt/ram/testhere of=/dev/null
6144000+0 records in
6144000+0 records out
3145728000 bytes (3.1 GB, 2.9 GiB) copied, 6.99788 s, 450 MB/s
root@testserver:~# dd if=/mnt/ram/testfile of=/dev/null
dd: failed to open '/mnt/ram/testfile': No such file or directory
root@testserver:~# dd if=/mnt/ram/testhere
testhere
root@testserver:~# dd if=/mnt/ram/testhere of=/dev/null
6144000+0 records in
6144000+0 records out
3145728000 bytes (3.1 GB, 2.9 GiB) copied, 6.94865 s, 453 MB/s
root@testserver:~# dd if=/mnt/ram/testhere of=/dev/null bs=1M
3000+0 records in
3000+0 records out
3145728000 bytes (3.1 GB, 2.9 GiB) copied, 1.49836 s, 2.1 GB/s


linux, ramdisksize, ram, megabytes, mnt, mount, disk, mounted, tmpfs,

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