Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On 05/18/2011 04:09 AM, Richard Stockton wrote: > Hi drbd folks, > > We have been using DRBD with heartbeat for several years now. > The load averages on our RedHat servers have almost always stayed > below 1.0. Suddenly last week the loads jumped up to 12-14 on > both servers. They go down at night, when the usage goes down, > but by mid-day every business day they are back to 14. > > We don't see anything out of the ordinary in logs, no drive > warning lights, no degraded RAID, nothing especially out of > bounds in iostat, NFS is running smoothly, tcpdump doesn't > show any nastiness (that we can see).... > We have run out of ideas. > > Our setup is 2 disk arrays, with each server the fail-over for > the other. These are POP/IMAP accounts with half the alphabet > on one server and half on the other. If one server fails, the > other one takes over all of the alphabet. Each letter is a > separate resource, with a separate IP, etc. The size of the > letter partitions range from 5G to 120G. The pop/imap servers > access the letters via NFS3. > > RedHat 5.3 (2.6.18-128.1.10.el5) > DRBD 8.3.1 > Heartbeat 2.1.4 > > Has anyone seen this sort of behavior before, and if so, what > the heck is happening? We would appreciate any suggestions. Is NFS mounted sync or async? Which I/O scheduler is in use for your DRBDs (i.e., for their backing devices)? Regards, Felix