On Mon, Jan 24, 2011 at 22:48, cwlists <cwlists at gmail.com> wrote: > On Sun, Jan 23, 2011 at 00:14, compdoc <compdoc at hotrodpc.com> wrote: >>>I have built a new PC on which I've installed CentOS 5.5 64-bit (with >>>updates) which after some hours of running suddenly either hard freeze >>>or instant power off. >> >> Can you check a setting in the bios - see if there's an option named: PCI >> Latency Timer > > No, only some frequency adjustment of the PCI-Express bus. > > Update: > After some more days of running Fedora 14 those disk timeouts has > started to appear. After a search on the net about similar NCQ > problems I added this to /etc/rc.local yesterday, and so far I haven't > seen any disk timeouts since then: > > for D in sd{b,c,d,e,f,g} ; do > echo 1 > /sys/block/$D/device/queue_depth > done > > Eventually I wish to install CentOS 6 and hopefully I will not have > the same problem as with CentOS 5.5. In the mean time I will make a > try with Scientific Linux 6 alpha or RHEL 6 beta2 and see what > happens. Update 2: Since the 25:th of January the PC has been running SL 6 (6rolling, dated 2011-01-21) without any problems at all (except the NCQ problem which has been solved by the earlier mentioned solution above). I'm still a bit confused that an OS can make a PC to suddenly power off, but at least now I feel confident that I don't have to replace any part of the newly bought hardware if I run RHEL/CentOS/SL 6. //Christian