topic Re: Create file system in RAM on Linux box? in Operating System - Linux

Create file system in RAM on Linux box?

Joakim Brosten — Mon, 17 Mar 2008 06:26:47 GMT

Hi,

I would like to create a file system RAM for disk performance measuring purpose.

Any one that could help me out?

Thanks in advance, /Joakim

Re: Create file system in RAM on Linux box?

Steven E. Protter — Mon, 17 Mar 2008 09:27:07 GMT

Shalom,

Some forms of Linux already do this to an extent.

none 1014M 0 1014M 0% /dev/shm

I've never bothered to try and write a file to it and recommend not filling it up.

I just copied a small file into it and deleted it without difficulty.

SEP

Re: Create file system in RAM on Linux box?

Alan_152 — Mon, 17 Mar 2008 20:33:29 GMT

Try this document:

http://www.vanemery.com/Linux/Ramdisk/ramdisk.html

Re: Create file system in RAM on Linux box?

Vitaly Karasik_1 — Tue, 18 Mar 2008 06:52:06 GMT

As far as I understand, tmpfs is the preferred method for using RAM as filesystem.

It's simple:

# make the mount point for our temporary filesystem
mkdir /mnt/tmpfs
# create and mount a 100 megabyte (100M) temporary memory filesystem
sudo mount -osize=100m tmpfs /mnt/tmpfs -t tmpfs
(from http://256.com/gray/docs/misc/linux_memory_tmp_filesystem_fs.shtml)

for more - http://www.mjmwired.net/kernel/Documentation/filesystems/ramfs-rootfs-initramfs.txt

Re: Create file system in RAM on Linux box?

Joakim Brosten — Tue, 18 Mar 2008 09:13:42 GMT

Thank you everyone,

I added "ramdisk_size=10000000" in "/boot/grub/meny.lst" as boot option. Rebooted and then run "mkfsreiser" on /dev/ram0 and mounted it on /mnt. (=10 GB disk in RAM)

I havn't tried the tmpfs way but will do so later.

/Joakim