Like i said, i couldn't find anything in the logs besides eviction
messages after i manually reset the server. Yes, we do use PHP and
sessions which use memcached as a backend.|
Marc Grimme wrote:
On Thursday 09 October 2008 01:24:51 Janar Kartau wrote:Hi, Recently our three-node webserver cluster started randomly crashing. I never had time to investigate what the problem was, cause i needed to bring them back online again. But it seemed like alla Apache processes just hang (couldn't even kill them).. waiting for something. The only thing that helped, was a reboot for all or couple of the nodes. Anyway, today i encountered this problem at night and i could look into it a little more. I noticed that some of the GFS filesystems were unaccessable (we have 5 of them, mounted on every nide) and of the nodes was completely unaccessable. So i guessed that this half-dead node was holding locks on the filesystems or sth. Did a hard reset on this dead node and all stabilized. Absolutely no cluster/GFS errors in the logs (besides the ones which tell that the half-dead node was leaving the cluster when i reset it). Nodes have CentOS 4.6 installed (2.6.9-67.0.7.ELsmp, dlm-1.0.7-1, GFS-6.1.15-1, cman-1.0.17-0.el4_6.5). We use EMC CX3-10c for GFS storage (over iSCSI) and EMC PowerPath for multipathing. Separate VLAN is used for CMAN/DLM traffic. Please give me ideas how to solve this or atleast some debugging tips as it's happening twice a day now and seems i simply can't help it. :(Could you provide more information like relevant syslogs and console messages? Are you using php with sessions?