Thanks for the offer to help. I have limited hardware at the moment and am going with another solution. My preference would be to have a rock solid simple setup first. One MDS, One monitor, and a few OSD's all on the same machine, but it should be very difficult to crash the system in the most simple setup. And if you do there should be a fail safe way to bring it back (I'm okay if I loose the last x hours of changes). Unfortunately, I was able to crash the mds twice in a just a few hours of use with no simple way to revert back my changes. On trying moosefs, I got much further along (Ceph has a lot more functionality than moosefs so this might not be a fair comparison. For me, I'm willing to give up functionality for stability). I did crash moosefs once but, they snapshot their meta data so I was able to revert back to a file an hour back and was back and was back up and running wit no help from outside. They also have a very cool web interface. I'll be watching ceph closely and will be back in a few months to try it again. Thanks for all your hard work. On Mon, Jul 11, 2011 at 12:24 PM, Tommi Virtanen <tommi.virtanen@xxxxxxxxxxxxx> wrote: > On Fri, Jul 8, 2011 at 20:39, Vineet Jain <vinjvinj@xxxxxxxxx> wrote: >> Using ceph version 0.3 and the ceph kernel that comes with ubuntu 11.04. >> >> I've setup 5 osds and one one mon and mds on one machine. When I first >> started, without writing any data to the ceph fs my mds would keep >> crashing. I fixed that problem by deleting the mod data directory and >> the ceph data directories and restarting ceph. I then started copying >> test data from a 2tb external drive to my ceph fs. I left my computer >> and came back and could not login to my machine. I saw that the >> external drive light was blinking so something was going on. I did a >> hard power off thinking I would just delete the last file that was >> copied over and start over. >> >> As expected, I could not start up ceph again. I had to delete all the >> data directories again to get ceph up again. Is there any way to flush >> whatever to get ceph back to some sort of stage where you can enter >> back into the fs without having to purge everything a start over? > > Can you please provide core dumps and log messages from those MDS > crashes? Getting tickets filed at > http://tracker.newdream.net/projects/ceph with the relevant > information is what will help us fix your problems. > > Recovery, where not automatic, depends very much on the crash you saw. > We'd be glad to help, but need more information to do so. > -- 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
