Messages in this thread | | | From | "Ingles, Raymond" <> | Subject | Odd problem, maybe iso9660, maybe disk cache | Date | Mon, 6 Mar 2000 10:12:13 -0500 |
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I've been tiptoeing my way into CD burning, and I recently ran off a copy of a CD (updated drivers for my motherboard) using cdrecord to read directly from my IDE CD drive and writing to my SCSI CDRW. I then mounted both of them and ran a recursive diff. I got the following output:
Only in /scsicd/ASUSLM: ST5UNST.EX_ Only in /scsicd/ASUSLM: StdOle2.tl_ Only in /scsicd/ASUSLM: UNINSTAL.EX_ Only in /scsicd/ASUSLM: VB5StKit.dl_
Now, this is weird, because /scsicd is the CDRW, and I couldn't figure out how it could have *added* files during the burning process. An ls on the directories in question showed no difference. A second diff -r now showed no differecences.
Eeek, intermittent problem! I set up a script and ran it for a while - the problem shows up ~1/20 times, in spurts - on any given run of 10 diffs, it'll show up 3 or 4 times, or not at all. And sometimes it says the files are only on the IDE CD, and sometimes only on the SCSI CDRW, but it's *always* those four files.
Current config:
Kernel 2.2.11, unpatched except for some joystick modules. (I'm hoping to upgrade to 2.2.14 in the next few days) The special ALi V IDE patches are *not* applied. (No point since the IDE CD is the only IDE device in the system.) ASUS P5A motherboard, K6-II/400MHz (not overclocked), 2x64MB DIMMS (i.e. 128MB) Ancient Creative 4x ATAPI IDE CD, /dev/hdc, no SCSI emulation NCR53c825 SCSI controller, ncr53cxx driver (sym53cxx needs 825a) Yamaha CDRW6416SZ, has worked fine up to now
I ran a script that just did:
for i in 1 2 3 4 5 6 7 8 9 10 do mount /idecd; mount /scsicd; strace diff -r /idecd /scsicd 2> /tmp/pass$i; umount/idecd; umount/scsicd; done
The key difference between a successful and unsuccessful run:
2133,2136c2133 < getdents(3, /* 39 entries */, 984) = 896 < lseek(3, 2230, SEEK_SET) = 2230 < lseek(3, 0, SEEK_CUR) = 2230 < getdents(3, /* 1 entries */, 984) = 24 --- > getdents(3, /* 35 entries */, 984) = 800
And I saved a run with no problems, one with "Only in /idecd", and one with "Only in /scicd". Of course, these files are 29MB uncompressed, 5MB gzipped, so I haven't included them, but I'll find a way to send them to anyone who asks, or just the differences between them.
Any ideas, on how to fix it or what to look for to further localize it?
Sincerely,
Ray Ingles (248) 377-7735 ray.ingles@fanucrobotics.com
"I may submit to the unknown, but never to the unknowable." - Roger Zelazny
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