[email protected] wrote: > I use 4 disks in a software RAID 5 array. How > would one sort out or even find out if this could be the source of a > problem?
It's pretty easy. Wait until the symptoms occur (by default the mdadm package on Ubuntu schedules a rebuild starting early in the AM on the first Sunday of the month). Then launch the system monitor from the GUI or use the equivalent command line tools (ps or top) to find a process with a name like md0_resync and drop its priority to something low, like -15. If that resolves the symptom, then you should install a permanent fix. On my system I modified /etc/cron.d/mdadm to run a few additional commands to drop the priority. Onto the end of the existing command line, I tacked: && sleep 60 && renice 15 `pidof -s -x md1_resync` > /dev/null and that permanently solved it for me. Prior to this I spent months playing around with the MD driver parameter speed_limit_min, both manually via /proc, and via /etc/sysctl.conf (dev.raid.speed_limit_min), but eventually determined that the system was CPU bound rather than I/O bound during rebuilds. -Tom ------------------------------------------------------------------------------ Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are powering Web 2.0 with engaging, cross-platform capabilities. Quickly and easily build your RIAs with Flex Builder, the Eclipse(TM)based development software that enables intelligent coding and step-through debugging. Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com _______________________________________________ Mvpmc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mvpmc-users mvpmc wiki: http://mvpmc.wikispaces.com/
