I'm off to gather more data, but I'm developing a deep suspicion that something with external usb disk support ain't right in fedora 12 x86_64.
With both the native usb on my motherboard and a pcie usb card, if I copy the fedora 13 alpha x86_64 DVD to the usb drive, the sha256sum checksum test fails on the copy.
If I do the same copy on the same hardware booted from my old fedora 10 x86_64 partition, the copy correctly matches the sha256sum test.
Anyone else with suspicious usb drive results on large files?
It will take a while, but I'm off to try this several times on both fedora 12 and fedora 10. If my results are consistent, I guess I'll submit a bugzilla (against the kernel?).
On Sat, 20 Mar 2010 19:38:23 -0400 Tom Horsley wrote:
I'm off to gather more data, but I'm developing a deep suspicion that something with external usb disk support ain't right in fedora 12 x86_64.
Nah, forget f12 problems. Looks a lot more like hardware problems with my motherboard. I think my initial test on f10 worked because the file being checksummed was entirely cached in memory. With a reboot between the writing and the checksumming, both f12 and f10 fail every time.
I guess my next step is to try again with the case open and a fan blowing cool air into it :-).
On Sat, 20 Mar 2010 21:55:27 -0400 Tom Horsley wrote:
I guess my next step is to try again with the case open and a fan blowing cool air into it :-).
Came up with a simpler way to test overheating:
I found the --bwlimit option of rsync, and persuaded rsync to write at only half the average speed the device could actually support. Ta-DA! Perfectly copied files - no checksum errors.
I gotta get better cooling on the chipset, but for now I can run my nightly backups with the --bwlimit option.
On 3/21/2010 8:08 AM, Tom Horsley wrote:
I found the --bwlimit option of rsync, and persuaded rsync to write at only half the average speed the device could actually support. Ta-DA! Perfectly copied files - no checksum errors.
I gotta get better cooling on the chipset, but for now I can run my nightly backups with the --bwlimit option.
So I know to avoid it, what mobo and chipset was this?
On Sun, 21 Mar 2010 21:47:19 -0400 Eric Wood wrote:
So I know to avoid it, what mobo and chipset was this?
I doubt it is a problem on a more normal machine, but I'm running a totally fan-free system, and there probably isn't enough airflow for the passive cooler that came with the motherboard:
http://home.comcast.net/~tomhorsley/hardware/zooty/zooty.html#Upgrade
has the latest hardware specs.
On Sun, 2010-03-21 at 08:08 -0400, Tom Horsley wrote:
I found the --bwlimit option of rsync, and persuaded rsync to write at only half the average speed the device could actually support. Ta-DA! Perfectly copied files - no checksum errors.
You hadn't previously mentioned you were using rsync. Depending on what exactly you're doing, rsync can certainly more b/w than you expect because it reads the target volume to see what needs to be changed.
poc
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Eric Wood -
Patrick O'Callaghan -
Tom Horsley