>>is writeback+direct instead, so I don't think this should affect rbd.
Does qemu-img mirror really send the flush with writeback ? for ceph, by default: "rbd cache writethrough until flush = true" and we have a patch for rbd driver https://git.proxmox.com/?p=pve-qemu.git;a=blob;f=debian/patches/pve/0018-block-rbd-disable-rbd_cache_writethrough_until_flush.patch;h=e75da3c6cf820999d1b696ddac6d63a61f8a529f;hb=HEAD which said : if cache=unsafe, "rbd cache writethrough until flush=false" (I need to dig in pve-devel mailing, I think we have already talk about this 1 or 2 years ago) ----- Mail original ----- De: "Fabian Grünbichler" <[email protected]> À: "pve-devel" <[email protected]> Envoyé: Lundi 26 Mars 2018 08:42:14 Objet: Re: [pve-devel] [PATCH qemu-server] qemu-img convert: use cache=none On Fri, Mar 23, 2018 at 04:45:11PM +0100, Alexandre DERUMIER wrote: > any impact on ceph rbd ? (as writeback help a lot with sequential writes on > ceph) the default for convert is 'unsafe', which is writeback+no-flush. 'none' is writeback+direct instead, so I don't think this should affect rbd. _______________________________________________ pve-devel mailing list [email protected] https://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel _______________________________________________ pve-devel mailing list [email protected] https://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
