Ceph

Jan Smets wrote:

Having the journal (or even data) on a memory filesystem would be usefull for testing.

Filesystem Size Used Avail Use% Mounted on
none 3.0G 0 3.0G 0% /dev/shm

osd journal = /dev/shm/journal
osd journal size = 500

mount failed to open journal /dev/shm/journal: Inappropriate ioctl for device
maybe journal is not pointing to a block device and its size wasn't configured?

Does /dev/shm/journal already exist? Did you get this error during mkcephfs? (mkcephfs should create it...) You can also try

ceph mon getmap -o /tmp/monmap
cosd -i 0 --monmap /tmp/monmap --mkjournal

to create it.

There shouldn't be anything special about tmpfs.. the journal can be a raw block device or a file. In this case it's a file.

tmpfs lacks user_xattr.

not necessary for the journal.

use

journal dio = false

Thanks. Please close.