I'm still missing something. I can check on the monitor to see that the running config on the cluster has rbd cache = false [root@essperf13 ceph]# ceph --admin-daemon /var/run/ceph/ceph-mon.essperf13.asok config show | grep rbd "debug_rbd": "0\/5", "rbd_cache": "false", Since rbd caching is a client setting I've added the following to the rbd client /etc/ceph/ceph.conf [global] log file = /var/log/ceph/rbd.log rbd cache = false rbd readahead max bytes = 0 "should be" disabled if rbd cache = false, but I'm paranoid [client] admin socket = /var/run/ceph/rbd-$pid.asok I never see a rbd*asok file in /var/run/ceph. I started the rbd driver on the client without /var/run/ceph directory and then see: 2015-02-02 14:40:30.254509 7f81888257c0 -1 asok(0x7f8189182390) AdminSocketConfigObs::init: failed: AdminSocket::bind_and_listen: failed to bind the UNIX domain socket to '/var/run/ceph/rbd-1716.asok': (2) No such file or directory When I attempt to map the rbd image to the client device with "rbd map". Once I create /var/run/ceph these messages don't occur. So it appears that the admin sockets are being created, but only for the duration of the command. I still see the effects of rbd caching if I run fio/vdbench with 4K random reads, but I have not been able to create a persistant rbd admin socket so that I can dump the running configuration and/or change it at run time. Any ideas on what I've overlooked? Any pointers to documentation on the [client] section of ceph.conf? rbd admin sockets? Nothing at ceph.com/docs on either topic. Thanks, Bruce -----Original Message----- From: Mykola Golub [mailto:to.my.trociny@xxxxxxxxx] Sent: Sunday, February 01, 2015 1:24 PM To: Udo Lembke Cc: Bruce McFarland; ceph-users@xxxxxxxx; Prashanth Nednoor Subject: Re: RBD caching on 4K reads??? On Fri, Jan 30, 2015 at 10:09:32PM +0100, Udo Lembke wrote: > Hi Bruce, > you can also look on the mon, like > ceph --admin-daemon /var/run/ceph/ceph-mon.b.asok config show | grep > cache rbd cache is a client setting, so you have to check this connecting to the client admin socket. Its location is defined in ceph.conf, [client] section, "admin socket" parameter. -- Mykola Golub _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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