Some low level caching might help, flashcache, dmcache,etc… But that may hurt the reliability to some extent , and make it harder for operator ☺
From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of Lindsay Mathieson Sent: Monday, January 5, 2015 12:14 PM To: Christian Balzer Cc: ceph-users Subject: Re: [ceph-users] Worthwhile setting up Cache tier with small leftover SSD partions? On 5 January 2015 at 13:02, Christian Balzer <ch...@gol.com<mailto:ch...@gol.com>> wrote: On Fri, 02 Jan 2015 06:38:49 +1000 Lindsay Mathieson wrote: If you research the ML archives you will find that cache tiering currently isn't just fraught with peril (there are bugs) but most importantly isn't really that fast. Yah, I had wondered that. Also it seems to involve a lot of manual tinkering with the crush map which I really want to avoid. Also given your setup, you should be able to saturate your network now, so probably negating the need for super fast storage to some extent. Agreed - now I have it installed and configured, performance all round has vastly improved - user are already commenting that their VM's are much more responsive. Pretty sure that we are now at a stage where I can just leave it alone :) Though the boss now wants to migrate the big ass vsphere server to proxmox (KVM), so I could use it as a third OSD server ,,, Thanks for the help, much appreciated,
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