[email protected] wrote: > Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s > avgrq-sz avgqu-sz await svctm %util > sda 0.41 13.61 2.17 5.93 0.03 0.08 > 26.28 0.29 35.16 1.25 1.01 > sdb 0.02 0.00 0.00 0.00 0.00 0.00 > 20.44 0.00 3.47 2.48 0.00 > sdc 0.16 0.05 1.99 1.56 0.19 0.10 > 167.25 0.04 12.46 7.05 2.50 > >>What purpose do these two drives serve in your system? > > sda - core OS drive, repository for backups from other systems that > run at 2 am (and otherwise don't touch it), zomeminder database > sdb - old myth drive, still ext3 from previous experiments > sdc - new (current) mythtv drive, which is used for nothing but > mythtv as it's data store.
You mention a zoneminder database on sda, by which I presume you mean the place the images are stored for events. That device seems to have high write requests at the time (wrqm/s). I presume your mysql database is also on this disk, both for zoneminder and mythtv. This would lead to potentially high contention for random access to that drive when zoneminder is capturing events, as it is writing images to disk and adding data to mysql at the same time that mythtv is heavily accessing the mysql database for the seektable. Have you looked for a correlation between stuttering and zoneminder capturing events? -- Mike Holden http://www.by-ang.com - the place to shop for all manner of hand crafted items, including Jewellery, Greetings Cards and Gifts ------------------------------------------------------------------------------ _______________________________________________ Mvpmc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mvpmc-users mvpmc wiki: http://mvpmc.wikispaces.com/
