Same Problem here, the harddrive (2.5" Samsung HM121HC) running with Kernel 2.6.18-194.32.1.el5 (x86_64) produces errors on high load. With one step back kernel the errors are gone. Im already changed the harddrive with a new one, same errors on the newest kernel. dmesg output: hdc: status error: status=0x58 { DriveReady SeekComplete DataRequest } ide: failed opcode was: unknown hdc: drive not ready for command attempt to access beyond end of device hdc3: rw=0, want=25863980832, limit=225841770 attempt to access beyond end of device hdc3: rw=0, want=7830939224, limit=225841770 attempt to access beyond end of device hdc3: rw=0, want=31645262224, limit=225841770 attempt to access beyond end of device hdc3: rw=0, want=25863980832, limit=225841770 attempt to access beyond end of device hdc3: rw=0, want=25863980832, limit=225841770 hdc: status error: status=0x58 { DriveReady SeekComplete DataRequest } ide: failed opcode was: unknown hdc: drive not ready for command There are no errors logged in smart, i already try'd with smartctl -t long .... no errors. I also did a blocktest on this drive. Next step is to change the cables, but i don't think this would be a solution, i think it's a kernel IDE / DMA problem. Wolfgang Am 15.01.11 14:50, schrieb Ryan Wagoner: > On Sat, Jan 15, 2011 at 7:57 AM, Keith Roberts <keith at karsites.net> wrote: >> I hope to be be getting some custom made 80 wire UDMA IDE >> cables sorted ASAP. That should squeeze extra speed from all >> the drives on the machine. > You shouldn't need custom cables. IDE 80 pin cables can be sourced all > over the Internet for around $5 a cable. Prices have gone up since > they are now not common. You might even post a wanted ad on craigslist > and see if you can get a handful for a few bucks. > > Ryan > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos