On Sun, 02 Dec 2007 00:14:21 +0000 Nix <nix@xxxxxxxxxxxxx> wrote: > About once a year I get a SCSI parity error on one of my systems (the > only one with SCSI). I presume the cabling is substandard, but given my > coordination deficits and the rarity of the errors I'd do far more > damage replacing it than leaving it be. > > I had one of these today. > > The system (2.6.23.9) spotted the error, and seemingly recovered: > > Dec 1 12:53:40 loki warning: kernel: sym0: SCSI parity error detected: SCR1=132 DBC=50000000 SBCL=0 > Dec 1 12:53:40 loki warning: kernel: sym0:0: ERROR (81:0) (8-0-0) (10/9d/0) @ (mem c2800048:ffffffff). > Dec 1 12:53:40 loki warning: kernel: sym0: regdump: da 00 00 9d 47 10 00 0e 00 08 80 00 80 00 0f 0a d0 58 3c 01 02 ff ff ff. > Dec 1 12:53:40 loki warning: kernel: sym0: SCSI BUS reset detected. > Dec 1 12:53:40 loki notice: kernel: sym0: SCSI BUS has been reset. > > However, after that reset I/O to any device on that controller is > *incredibly* slow. > > A monthly RAID check kicked off shortly afterwards and provided my first > clue. Load average >15, and: > > md1 : active raid5 sda6[0] hdc5[3] sdb6[1] > 76807296 blocks super 1.2 level 5, 64k chunk, algorithm 2 [3/3] [UUU] > [========>............] check = 42.8% (16450780/38403648) finish=253.3min speed=1442K/sec > > 1442Kb/s is a bit less than I'd expect from a three-drive array with > disks capable of 40Mb/s easily. > > /dev/sda: > Timing buffered disk reads: 8 MB in 3.50 seconds = 2.29 MB/sec > > A somewhat slower ATAPI disk on the same machine: > > /dev/hdc: > Timing buffered disk reads: 110 MB in 3.05 seconds = 36.08 MB/sec > > So, um, what could cause this? Can I speed it up again other than by > rebooting (which I'm just about to do, but it is annoying). > cc linux-scsi. Nothing is likely to happen. Please raise a report at bugzilla.kernel.org. - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
