Mark; Are you suggesting some other means to configure iSCSI targets with Ceph? If so, how do configure for non-tcmu? The iSCSI clients are not RBD aware, and I can't really make them RBD aware. Thank you, Dominic L. Hilsbos, MBA Director – Information Technology Perform Air International Inc. DHilsbos@xxxxxxxxxxxxxx www.PerformAir.com -----Original Message----- From: Mark Nelson [mailto:mnelson@xxxxxxxxxx] Sent: Monday, October 5, 2020 3:40 PM To: ceph-users@xxxxxxx Subject: Re: Ceph iSCSI Performance I don't have super recent results, but we do have some test data from last year looking at kernel rbd, rbd-nbd, rbd+tcmu, fuse, etc: https://docs.google.com/spreadsheets/d/1oJZ036QDbJQgv2gXts1oKKhMOKXrOI2XLTkvlsl9bUs/edit?usp=sharing Generally speaking going through the tcmu layer was slower than kernel rbd or librbd directly (sometimes by quite a bit!). There was also more client side CPU usage per unit performance as well (which makes sense since there's additional work being done). You may be able to get some of that performance back with more clients as I do remember there being some issues with iodepth and tcmu. The only setup that I remember being slower at the time though was rbd-fuse which I don't think is even really maintained. Mark On 10/5/20 4:43 PM, DHilsbos@xxxxxxxxxxxxxx wrote: > All; > > I've finally gotten around to setting up iSCSI gateways on my primary production cluster, and performance is terrible. > > We're talking 1/4 to 1/3 of our current solution. > > I see no evidence of network congestion on any involved network link. I see no evidence CPU or memory being a problem on any involved server (MON / OSD / gateway /client). > > What can I look at to tune this, preferably on the iSCSI gateways? > > Thank you, > > Dominic L. Hilsbos, MBA > Director - Information Technology > Perform Air International, Inc. > DHilsbos@xxxxxxxxxxxxxx > www.PerformAir.com > > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx > _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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