I tried it again with random filenames. 3 tests in 500 consecutive copying of a 76578 byte file, averaged 50.7 failed. Is it possible that this is caused by faulty memory too?
Thanks Mike! -JP On Tue, Jul 14, 2009 at 09:04, Michael Tinsay<[email protected]> wrote: > Possibly HD or controller failure even if S.M.A.R.T. doesn't report anything. > It may have been that the 11 files were all written to the same bad > sector(s). > > Did you Copy, Hash, Compare, Delete, repeat 500 times? Try just Copy (to a > random filename), Hash, Compare, Repeat (with a new random filename). > > When I transfer large files between flash drives or USB HDDs I usually do MD5 > hashes to validate the copies. Every now and then I do encounter different > hashes, most of the times recopying the file fixes things. > > --- mike t. > > > > > ----- Original Message ---- >> From: John Peter Loh <[email protected]> >> To: Philippine Linux Users' Group (PLUG) Technical Discussion List >> <[email protected]> >> Sent: Monday, July 13, 2009 17:11:56 >> Subject: [plug] Root Kit, Hardware failure or something else? >> >> Hi all, >> >> I remember reading on the list where a server got attacked with a root >> kit. It made me really paranoid and I think one of our servers got >> attacked with a root kit too! >> >> I checked with S.M.A.R.T. and the HDs are reported to be working fine. >> I checked the serial number of the disks with Seagate and it seems >> that the disks were only manufactured last year. >> >> The problem is files sometime fail to get written properly. I tried >> copying a file 500 times and getting the md5 hash of the copied file. >> Out of 500 writes, 11 returned different hashes. Is there a known root >> kit attack that randomly modifies files? >> >> What else could cause this? Are there other tests that I can do? I'm >> hoping to rule out a breach in the system. >> >> Thanks, >> JP >> _________________________________________________ >> Philippine Linux Users' Group (PLUG) Mailing List >> http://lists.linux.org.ph/mailman/listinfo/plug >> Searchable Archives: http://archives.free.net.ph > > _________________________________________________ > Philippine Linux Users' Group (PLUG) Mailing List > http://lists.linux.org.ph/mailman/listinfo/plug > Searchable Archives: http://archives.free.net.ph > _________________________________________________ Philippine Linux Users' Group (PLUG) Mailing List http://lists.linux.org.ph/mailman/listinfo/plug Searchable Archives: http://archives.free.net.ph
