Dear Somnath Roy,
Thank you for your answer. What king of tuning do your recommend ?
Thanks !
Best regards,
--
Thank you for your answer. What king of tuning do your recommend ?
Thanks !
Best regards,
De: "Somnath Roy" <Somnath.Roy@xxxxxxxxxxx>
À: "Hugo Slabbert" <hugo@xxxxxxxxxxx>, "Jason Dillaman" <dillaman@xxxxxxxxxx>, "Gaetan SLONGO" <gslongo@xxxxxxxxxxxxx>
Cc: ceph-users@xxxxxxxxxxxxxx
Envoyé: Mercredi 4 Novembre 2015 22:48:27
Objet: RE: iSCSI over RDB is a good idea ?
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
À: "Hugo Slabbert" <hugo@xxxxxxxxxxx>, "Jason Dillaman" <dillaman@xxxxxxxxxx>, "Gaetan SLONGO" <gslongo@xxxxxxxxxxxxx>
Cc: ceph-users@xxxxxxxxxxxxxx
Envoyé: Mercredi 4 Novembre 2015 22:48:27
Objet: RE: iSCSI over RDB is a good idea ?
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
--
 | Gaëtan SLONGO | IT & Project Manager Boulevard Initialis, 28 - 7000 Mons, BELGIUM
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