All of lore.kernel.org
 help / color / mirror / Atom feed
From: Mitchell Laks <mlaks@post.harvard.edu>
To: linux-raid@vger.kernel.org
Subject: raid 1 single drive failure. rebuilt with replacement drive. missing 20G of data
Date: Wed, 11 Mar 2009 22:10:24 -0400	[thread overview]
Message-ID: <20090312021024.GA31067@earthlink.net> (raw)

Hi,

I have used linux software raid1 for many years without any data loss. Now I seem to have a problem.

I run a server with a pair of WD 400G drives that I keep in a raid 1 configuration. The raid became degraded
but continued to function and continue to store data on the remaining  drive. 

I simply replaced the faulty drive and rebuilt the raid. All seemed to be   ok,  however now I notice that 20G of data are 
missing from the raid. I see this by comparing to a backup device that I mirror to every night.

Any idea on how can this have happened? These are the most recent 20G of data. Perhaps this is the last 20 G since the 
raid went bad,  however that the data was clearly stored initially - I see it on the backup device I copied to.

Could the data   have been lost in the rebuild process? seems strange. Total of 220G of data on the device at present.

The server is  running debian 4.0 (etch) which runs mdadm-2.5.6-9 (debian). Linux kernel 2.6.18-5-686


Thanks

Mitchell Laks

             reply	other threads:[~2009-03-12  2:10 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-03-12  2:10 Mitchell Laks [this message]
2009-03-12  2:22 ` raid 1 single drive failure. rebuilt with replacement drive. missing 20G of data Mitchell Laks
2009-03-23  6:09 ` Neil Brown
2009-03-23 20:29   ` Nifty Fedora Mitch

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20090312021024.GA31067@earthlink.net \
    --to=mlaks@post.harvard.edu \
    --cc=linux-raid@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.