I'm rummaging thru the options, but I do not really see an option to fully disable journaling? One of the reasons for testing that is that ZFS already has very good journaling functionality. So I'd like to see what kind of performance difference that makes. Or is this like setting journal-size to 0 or the path to /dev/null?
All writes go through the journal, so it is required. However, the journal can be in a file within the OSD data partition. To deploy an OSD in this configuration, it should be sufficient to *not* supply the JOURNAL positional parameter to "ceph-disk prepare" [1].
By doing this, you of course lose the option of putting the journal on a separate (SSD) disk. If your data partition is on an HDD, journal-on-SSD is going to give superior performance.
[1] See "ceph-disk prepare --help" for a description of these arguments. -- Nathan Cutler Software Engineer Distributed Storage SUSE LINUX, s.r.o. Tel.: +420 284 084 037 -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
