On Thu, Aug 10, 2006 at 06:54:04PM -0400, Sean Bryant wrote:

Yes, maybe I wasn't clear on this. I think I described it only slightly in my first gjournal announce.

GJournal is not file system journaling, it needs separate journal space. If you 'gjournal label' only one partition, it will put journal at the end on this partition and leave space for data at the begining of the partition.

To convert existing file system to gjournal you have to: 1. Have separate partition for journal. 2. Confirm that partition with your file system is _not_ 4 sectors aligned. If it is not 4 sectors aligned, it is safe for gjournal to use its last sector for metadata. You can verify this by running:

test `diskinfo /dev/<data_partition> | awk '{print $4}' | xargs -J X
echo X % 4 | bc` -eq 0 && echo ok || echo not ok

Then you need to run those commands:

# gjournal label /dev/<data_partition> /dev/<journal_partition> # tunefs -n disable -J enable /dev/<data_partition>.journal