What I mean is that my understanding of RBD is that it is designed to do no more than to present a block device. In that context, what you're asking is more like whether they will support persistent reservations. RBD being just a block device is at a lower level, and you'd have to add something on top of it that is aware of sharing/locking. On Sat, Aug 11, 2012 at 6:26 PM, Marcus Sorensen <shadowsor@xxxxxxxxx> wrote: > But you put a /dev/drbd atop a block device. > > On Aug 11, 2012 6:09 PM, "Sébastien Han" <han.sebastien@xxxxxxxxx> wrote: >> >> Hi Marcus, >> >> I didn't really get your first sentence, but I don't think so, for >> instance DRBD manages his own /dev/drbd device and voluntary puts a >> lock on a resource with a 'secondary' state, like the single-primary >> mode. So I would say that it's even higher than lower... >> >> Cheers! >> >> On Sun, Aug 12, 2012 at 1:58 AM, Marcus Sorensen <shadowsor@xxxxxxxxx> >> wrote: >> > Isn't it supposed to be lower level than that? More like just a block >> > device >> > such as a SAN or iscsi device? DRBD(GFS,OCFS,CLVM) goes on top of that. >> > >> > On Aug 11, 2012 5:51 PM, "Sébastien Han" <han.sebastien@xxxxxxxxx> >> > wrote: >> >> >> >> Hi guys, >> >> >> >> With RBD images, the theory makes possible to mount them multiple >> >> times on different servers, of course **no one** wants that. If you >> >> care about the consistency of your data :D >> >> I was wondering if ceph has any lock ability on the RBD device like >> >> DRBD does with secondary resource. Apparently not, I was able to mount >> >> an image on multiple server and wrote data on both. >> >> >> >> Is this an incoming feature? >> >> >> >> I don't really know the difficulty level that this kind of feature >> >> implies, but it would be nice to have it. >> >> >> >> Cheers! >> >> -- >> >> 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 -- 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
