Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi everybody, I have an OLTP application running on a 2 node cluster on top of DRBD. ( App: CentOS Linux --> MySql --> Perl --> Apache ) ( Disk: Disk Partition --> LV --> DRBD --> Mount point ) ( Cluster: DRBD <-- primary/primary --> DRBD ) Before I moved to this DRBD cluster setup, my response-time-graph was very consistent and stable (flatline). After I moved to DRBD, the response-time-graph became inconsistent with peaks that don't make sense. Eg. typical response time would be 0.2 seconds. Now I have responses of, for instance 3 or more seconds every now and then). The cluster hardware have more CPU's, more memory, faster everything, and yet the response-times are slower and less consistent than my "no DRBD" setup. It's been running in production with DRBD for several months. Everything seems stable, other than the inconsistent performance. Could this be a misconfiguration on my part (or lack of tuning), or is this normal? The server load is under 40%. The disks aren't very busy either. The response-time-graph is fed by a few queries on the database across important tables. Any guidance or help will be MUCHOS appreciated :) Thanks and Regards, Peet de Vos Orax Solutions 082 629 9915 peet at orax.co.za www.orax.co.za Fax: +27 12 803 5084 - P.O.Box 75250, Lynnwood Ridge, 0040, Pretoria, South Africa -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20100310/19a2dc48/attachment.htm> -------------- next part -------------- A non-text attachment was scrubbed... Name: Signature-SDI.gif Type: image/gif Size: 16643 bytes Desc: not available URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20100310/19a2dc48/attachment.gif>