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I'm using Debian 6.03 (2.6.32-5-amd64) with LVM configured. For testing I created testfs logical volume and formatted it in reiser4 filesystem. But when I try:

# mount /dev/lv-group/testfs /mnt

it says:

mount: unknown filesystem type 'reiser4'

reiser4progs are also installed. What's the problem?

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What feature are you using the reiser filesystem for over some of the other very stable filesystems out there like ext4? ext3? xfs? – mdpc Mar 19 '12 at 18:19
@mdpc it's just testing of filesystem's performance. – mickey Mar 19 '12 at 18:37
up vote 1 down vote accepted

You aren't running a patched kernel with reiser4 support. It was never merged into the mainline kernel and since Hans Reiser is in prison for the murder of his Wife, it is a dead filesystem. If you are looking for similar features, look at btrfs, but it is still not ready for production environments.

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ok, is it good idea to use btrfs in system which reads/writes ~2k or more small files? – mickey Mar 19 '12 at 18:24
@mickey, yes, btrfs handles small files well. – psusi Mar 19 '12 at 20:37

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