On Tue, Mar 9, 2010 at 6:31 AM, Timothy D. Lenz <tlenz@xxxxxxxxxx> wrote: > I'm working on 2 systems that are mainly for running vdr. I've had these > running somewhat for awhile with raid. But a couple nights ago as I was > quitting for the night, I noticed one of the computers drive light staying > on. I had just made some changes to xine and didn't know if something had > crashed. Turned on the TV and found the video was freezing for 10-20secs > every 10-20secs. Logging in using putty and winscp I found it very sluggish > to respond.Starting top I found it was doing the regular array check/resync. > The process was using about 64% cpu and cpu was staying at idle speed > (1000Mhz). These computers use Athlon64 x2 cpu's. A problem with the AN2 > socket systems is that when the cpu is throttled back, it also slows the > bus. This has been found to be a problem on boards with integrated graphics > when using nvidia's vdpau for hardware video decoding because they use > system ram. The fix is to set the lower speed limit to 1800Mhz and/or change > the up_threshold to ~50% . However, I am using PCIe video cards and so up > till now have not had a problem. > > I stopped vdr, but putty and winscp where still sluggish. This tells me that > it is loading the bus so much that both the video card and the network is > effected. it would also effect any tuner cards interfering with any > recording that may be going on at the time. I change the up_threshold from > the default 95% to 50% which should kick the speed up when it's syncing. But > I'm not sure that will be enough. Could there be some other setting that is > wrong raising the priority of the process? Seems like this would be a > problem for any system having raid maintenance bring the system to its > knees. The eta to finish was 75 minutes. > -- Sorry about the incredibly brief answer: Not to dismiss other issues, but that behavior seems like exactly what I've seen when a disk has been failing. -- Kristleifur -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
