We are using SCST over RBD and not seeing much of a degradation...Need to make sure you tune SCST properly and use multiple session.. Thanks & Regards Somnath -----Original Message----- From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Hugo Slabbert Sent: Wednesday, November 04, 2015 1:44 PM To: Jason Dillaman; Gaetan SLONGO Cc: ceph-users@xxxxxxxxxxxxxx Subject: Re: iSCSI over RDB is a good idea ? > The disadvantage of the iSCSI design is that it adds an extra hop between your VMs and the backing Ceph cluster. ...and introduces a bottleneck. iSCSI initiators are "dumb" in comparison to native ceph/rbd clients. Whereas native clients will talk to all the relevant OSDs directly, iSCSI initiators will just talk to the target (unless there is some awesome magic in the RBD/tgt integration that I'm unaware of). So the targets and their connectivity are a bottleneck. -- Hugo hugo@xxxxxxxxxxx: email, xmpp/jabber also on Signal _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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