On Thu, Jul 18, 2013 at 02:59:58PM -0700, Roger Binns wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 18/07/13 13:05, Chris Murphy wrote: > > Sounds like if I have a degraded 'single' volume, I can simply cp or > > rsync everything from that volume to another, and I'll end up with a > > successful copy of the surviving data. True? > > Not quite. I did it with cp -a. Because all the metadata survived, cp > would create the target file, but then get an i/o error on opening/reading > the source file. It would print an error message, but not delete the > empty target file. Consequently I ended up with loads of zero length files > I had to go in and delete afterwards.
The odds of having an undamaged file from that process are much better for single than for RAID-0 (and aren't affected by having tools which will cope better with IO errors -- although you'll get more of each damaged file if you do). As the file size goes up, the odds of it being damaged increase. Hugo. > I briefly looked for an rsync option to keep going on source i/o errors > but didn't find one. > > Roger > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.12 (GNU/Linux) > > iEYEARECAAYFAlHoZV4ACgkQmOOfHg372QRPFwCgob01TavS2qffBkxkuv0g9bl3 > pC8An25Mgx+cRXb0Kds+GRnzaj2P0Acy > =UA5J > -----END PGP SIGNATURE----- > -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 65E74AC0 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- I am an opera lover from planet Zog. Take me to your lieder. ---
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