Dear Somnath Roy, Thank you for your answer. What king of tuning do your recommend ?
Thanks ! Best regards, ----- Mail original ----- De: "Somnath Roy" <somnath....@sandisk.com> À: "Hugo Slabbert" <h...@slabnet.com>, "Jason Dillaman" <dilla...@redhat.com>, "Gaetan SLONGO" <gslo...@it-optics.com> Cc: ceph-users@lists.ceph.com Envoyé: Mercredi 4 Novembre 2015 22:48:27 Objet: RE: [ceph-users] 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-boun...@lists.ceph.com] On Behalf Of Hugo Slabbert Sent: Wednesday, November 04, 2015 1:44 PM To: Jason Dillaman; Gaetan SLONGO Cc: ceph-users@lists.ceph.com Subject: Re: [ceph-users] 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 h...@slabnet.com: email, xmpp/jabber also on Signal -- www.it-optics.com Gaëtan SLONGO | IT & Project Manager Boulevard Initialis, 28 - 7000 Mons, BELGIUM Company : +32 (0)65 84 23 85 Direct : +32 (0)65 32 85 88 Fax : +32 (0)65 84 66 76 GPG Key : gslongo-gpg_key.asc - Please consider your environmental responsibility before printing this e-mail -
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