Messages in this thread | | | Date | Thu, 17 Jun 1999 18:51:49 -0400 (EDT) | From | "Steven N. Hirsch" <> | Subject | Re: Massive e2fs corruption with 2.2.9/10? |
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On Thu, 17 Jun 1999, Larry McVoy wrote:
> If you pick up > > ftp://ftp.bitmover.com/pub/lmdd.tar.gz > > you will get a Linux binary and the source code (the only docs that are current, > I'm afraid) for a tool which was designed to deal with this problem. You > can do this > > lmdd of=XXX bs=10m move=120m opat=1 > > To read it back and make sure the pattern is there > > lmdd if=XXX bs=10m move=120m ipat=1 > > You can also read it back using random offsets within the file, something > which sometimes catches an error or two: > > lmdd if=XXX bs=512 rand=120m count=1000 ipat=1
I grabbed a copy of lmdd and tried it on:
- dual-PII SMP, 128MB Mem, 2 x 333Mhz. w/ on-board Adaptec two-ch. AIC7895 UW controller RedHat 5.2 Install 2.2.10-ac1 kernel
(hirsch@pii) /tmp : lmdd of=test1.file bs=10m move=500m opat=1 524.2880 MB in 34.1190 secs, 15.3665 MB/sec
(hirsch@pii) /tmp : lmdd if=test1.file bs=10m move=500m ipat=1 524.2880 MB in 30.9426 secs, 16.9439 MB/sec
(hirsch@pii) /tmp : lmdd if=test1.file bs=10m rand=500m ipat=1 .. (hang on, it's still churning away while I type this on the same box). .. (still going? I'll web-surf a bit..) .. ( ok, the heck with it..) ^C 10825.4986 MB in 735.9394 secs, 14.7098 MB/sec
Hey, Larry, I though it was supposed to stop on its own after 500MB? <g>
Anyway, as you'll see, I was unable to trip anything up. Maybe the corruption is some sort of IDE thing?
Steve
p.s. - Larry, thanks for slinging this out there!
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