Здравствуйте! On Fri, Mar 04, 2016 at 01:33:24PM +0100, honza801 wrote: > hi, > i have rbd0 mapped to client, xfs formatted. i'm putting a lot of data on it. > following messages appear in logs and 'ceph -s' output > osd.255 [WRN] 1 slow requests, 1 included below; oldest blocked for > > 51.726881 secs > osd.255 [WRN] slow request 51.726881 seconds old, received at > 2016-03-04 12:22:23.549737: osd_op(client.14296.1:389333 > rbd_data.37d230c8153.00000000000d1cc8 [set-alloc-hint object_size > 4194304 write_size 4194304,writefull 0~4194304] 2.fc8c5908 > ondisk+write e7523) currently waiting for subops from 120,239 > it causes slow downs on writes. iostat, load, dmesg on osds shows nothing odd. > could anyone give me a hint? I spent a lot of time with this trouble because of "overtuning" of Linux TCP/IP stack using sysctl. If your disks are not overloaded, if your network is not overloaded, take a look on network configuration including sysctl. BTW, default sysctl settings are quite well :) Things can be better, but they are stable anough. -- WBR, Max A. Krasilnikov _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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