Dear reader, short version: we are experiencing performance problems after 6/7 days of running time on the non lock master(s). long version: We have the following setup: a 4 node RHCS cluster where node 4 (backend) exports 3 raid disks via gnbd to the other nodes (1-3) The other 3 nodes (frontend) import those exports via gnbd. We have created 4 LV's via clvmd on top of those imported disks. logical volumes /dev/mapper/vg0-tmp 9.7G 1.1M 9.7G 1% /phpsessions /dev/mapper/vg0-config 9.7G 152K 9.7G 1% /config /dev/mapper/vg0-logging 100G 126M 100G 1% /var/log/httpd /dev/mapper/vg0-www 500G 222M 500G 1% /www as lock manager we use lock_dlm with following rpm's installed dlm-kernel-2.6.9-44.3 dlm-1.0.1-1 gfs version gfs_tool -V gfs_tool 6.1.6 (built Aug 25 2006 15:17:50) gnbd version Copyright (C) Red Hat, Inc. 2004-2005 All rights reserved. gnbd_import 1.0.8. (built Nov 14 2006 02:18:52) Copyright (C) Red Hat, Inc. 2004 All rights reserved. cman_tool status Protocol version: 5.0.1 os version centos 4.4 on all nodes all rpm's are from the centos.org website. all nodes are connected via a seperate NIC (GB) and private gigabit VLAN no other network traffic is on this VLAN. Now this is all running fine till 6 or 7 days running time than the nodes which are not lock master are becoming very slow in for example a df command. while df runs the cpu load rises to 4 or 5 and the node is not very responsive (it seems the os hangs for a few seconds) Running the top command at the same time shows 18524 root 15 -10 0 0 0 R 97.4 0.0 1:08.99 dlm_sendd 12959 root 18 0 4184 592 528 R 1.9 0.1 0:00.17 df so i think the problem is in dlm but i do not know how to debug this can someone give me some pointers? I checked /proc/cluster/dlm* but honestly do not know what to look for. regards Constan Sylconia.nl ---- This message was sent via a demo version of - http://atmail.com/ -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
