Comment 123 for bug 346691

Well, I'm still seeing my large file data corruption issue on mainline kernel 2.6.30-020630-generic

md1 : active raid5 sdc1[0] sdf1[3] sdd1[1] sdg1[4] sde1[2]
      1953535744 blocks level 5, 64k chunk, algorithm 2 [5/5] [UUUUU]

md0 : active raid1 sda1[0] sdb1[1]
      78123968 blocks [2/2] [UU]

md0 is 2 sata disks on intel ich10 chipset

md1 is 5 sata disks on sil Silicon Image, Inc. SiI 3132

pv -L 35M bigfile | md5sum
46a2c9e932c3feb32dc3edcd60a81d98 -
pv -L 35M bigfile | md5sum
24287e601aa23abb7b380c6577750bb0 -
pv -L 20M bigfile | md5sum
c65b3137a83c00d0bd20fd95c1ee2e88 -

I've gone in and checked the temperatures of all the components i can and they are well under max temps as stated in the system's tech specs. (using both in bios diagnostics and lm-sensors). the power supply is 300W and only consuming 100W ... the 5 sata disks are in an external chasis with separate power supply.

I've also rotated the disk, rebuilt the raid arrays, and tried downgrading the disks from 3.0 to 1.5 through jumper changes (and verified speed with dmesg). i've also removed a sata cd drive which was on ich10 controller.

i also thought this might have something to do with pci latency, as linux was setting everything to 64 latency (seen in dmesg), but my bios was set to 32 (don't know if that was actually an issue though). I've changed the bios values from 32 to 64 and all the way up to 248 (or something like that). still no change. i'm currently running at 64

i've also tried throttling down read speeds with pv -L rate.

interesting note ... i burned a new ubuntu install cd, and did a media test of it on the cd drive (before removed) and the test failed ... but performing on another box said the media was good. don't know if it was a bad cd drive or another manifestation of this issue.

my lspci is attached on a previous comment

i have not tested my system under 32 bit mode as the install media verification issue.