On Mon, 8 Feb 2010, Dawning Sky wrote:
Thanks for the good advice. ddrescue on sdb returned an error of 4kB. I do still have my old sde. But one thing I did, which was stupid, was trying to rebuild the raid-5 when it was mounted. So I don't know the old sde is still consistent with the rest 3 disks, since some files would have been modified between the times when I took the old sde offline and when the rebuild failed.
Please see the threads I have initiated the past 2-3 weeks, I had the exact same problem.
What you should do is just put in your new cloned drive, make sure it runs fine with 3 drives, and then start the rebuild with the drive that you were resyncing to. I've done this numerous times, and my experience says you will only have lost those 4 kilobytes of data that ddrescue couldn't read.
I'm now happily at RAID6 after doing a re-shape from 6 drive raid5-> 8 drive raid6, change of SATA cables and a new marvell 8channel controller... No more read timeouts anyway, and I should be better protected from single read errors like you are having.
-- Mikael Abrahamsson email: swmike@xxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
