Hi Wido: According to your reply, if I add/remove OSDs from Ceph cluster, I have to wait all PGs moving action are completed. Then 'rbd ls' operation may works well. Is there any way to speed up PGs action of adding/removing OSDs ? Thanks a lot. Best Regards, WD -----Original Message----- From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Wido den Hollander Sent: Thursday, October 08, 2015 10:06 PM To: ceph-users@xxxxxxxxxxxxxx Subject: Re: How to improve 'rbd ls [pool]' response time On 10/08/2015 10:46 AM, WD_Hwang@xxxxxxxxxxx wrote: > Hi, all: > If the Ceph cluster health status is HEALTH_OK, the execution time of 'sudo rbd ls rbd' is very short, like the following results. > $ time sudo rbd ls rbd > real 0m0.096s > user 0m0.014s > sys 0m0.028s > > But if there are several warnings (eg: 1 pgs degraded; 6 pgs incomplete; 1650 pgs peering; 7 pgs stale;), the execution time of 'sudo rbd ls rbd' may take a long time. > > Is there any way to improve the response time of 'rbd' commands? If you have incomplete PGs those can't serve any I/O. Same goes for PGs which are in peering state. That causes all RADOS operations to block. You'd have to resolve that situation and that will make 'rbd ls' snappy again. > Any help would be much appreciated. > > Best Regards, > WD Hwang > > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- > ------------------- This email contains confidential or legally > privileged information and is for the sole use of its intended recipient. > Any unauthorized review, use, copying or distribution of this email or the content of this email is strictly prohibited. > If you are not the intended recipient, you may reply to the sender and should delete this e-mail immediately. > ---------------------------------------------------------------------- > ---------------------------------------------------------------------- > ------------------- > > > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Wido den Hollander 42on B.V. Ceph trainer and consultant Phone: +31 (0)20 700 9902 Skype: contact42on _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |