[SATLUG] RAID5 Recovery - ddrescue: copy completed!

David Labens adlabens at swbell.net
Sun Aug 23 13:21:13 CDT 2009


Take your time, your help is most appreciated - beyond words.

I have looked at the wiki page, looks exactly like what you've been sending me - right down to the --direct.  However, I'm guessing that dd_rescue (ubuntu pkg is gddrescue) is just different enough.

David Labens

San Antonio, TX

--- On Sun, 8/23/09, Samuel Leon <satlug at net153.net> wrote:

From: Samuel Leon <satlug at net153.net>
Subject: Re: [SATLUG] RAID5 Recovery - ddrescue: copy completed!
To: "The San Antonio Linux User's Group Mailing List" <satlug at satlug.org>
Date: Sunday, August 23, 2009, 1:16 PM

David Labens wrote:
> Sam
> Every time I ran ddrescue, I gave it a different logfile name.  BUT, I don't think it uses the LOGFILE to figure out it's starting & stopping point.  I say this because when I figured out what I did wrong, and reran the command using a new logfile name, it still started copying from 80 gb!  That's when I figured I'd go in with fdisk and delete the partition & save it then recreate the partition.  I tried to do it without saving it (just delete partition & then recreate partition), and it still started from the 80 gb point.  But, when I saved it between, it started copying from the first byte to the last.  So, I'm confident that it did copy the full 250 gb from the source drive.
> Would running the command again cause it to do nothing because it already ran?  Wouldn't I need to delete the partition & start over?  Or does the change in the command parameter allow it to retry and repair in the process?
> David Labens

hmm, well if you are sure that it copied the data then I will have to take your word for it.

You could try: (note reusing same logfile)
ddrescue --direct --max-retries=3 /dev/sdb /dev/sda resclog1

just to make sure that it got all of the errors. If it truly is done then I guess it wouldn't do anything.

In the mean time I am going to build a small virtual raid5 set up in vmware and torture it some just to make sure I know what I am doing. Give me about an hour.

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