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From: Brad Campbell <brad@fnarfbargle.com>
To: Durval Menezes <durval.menezes@gmail.com>
Cc: linux-raid@vger.kernel.org, Drew <drew.kay@gmail.com>
Subject: Re: Maximizing failed disk replacement on a RAID5 array
Date: Wed, 08 Jun 2011 15:32:26 +0800	[thread overview]
Message-ID: <4DEF258A.8090600@fnarfbargle.com> (raw)
In-Reply-To: <BANLkTimxsT+htp82Us9uVgSdFNgb0m4vkQ@mail.gmail.com>

On 08/06/11 14:58, Durval Menezes wrote:

> 1) can I simply skip over these sectors (using dd_rescue or multiple
> dd invocations) when off-line copying the old disk to the new one,
> trusting the RAID5 to reconstruct the data correctly from the other 2

Noooooooooooo. As we stated early on, it you do that md will have no 
idea that the data missing is actually missing as the drive won't return 
a read error.

does a repair take long on your machine? I find that a few repair runs 
generally gets me enough re-writes to clear the dud sectors and allow an 
offline clone.

If your dd of the old disk to the new disk aborts with an error, do 
_not_ under any circumstances (well, unless you have really good 
backups) do a dd_rescue and just swap the disks.


  reply	other threads:[~2011-06-08  7:32 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <BANLkTimBYFhjQ-sC9DhTMO+PG-Ox+A9S2Q@mail.gmail.com>
2011-06-05 14:22 ` Fwd: Maximizing failed disk replacement on a RAID5 array Durval Menezes
2011-06-06 15:02   ` Drew
2011-06-06 15:20     ` Brad Campbell
2011-06-06 15:37       ` Drew
2011-06-06 15:54         ` Brad Campbell
2011-06-06 18:06           ` Durval Menezes
2011-06-07  5:03             ` Durval Menezes
2011-06-07  5:35               ` Brad Campbell
2011-06-08  6:58                 ` Durval Menezes
2011-06-08  7:32                   ` Brad Campbell [this message]
2011-06-08  7:47                     ` Durval Menezes
2011-06-08  7:57                       ` Brad Campbell
     [not found]                         ` <BANLkTi=BuXK4SBGR=FrEcHFC1WohNkUY7g@mail.gmail.com>
     [not found]                           ` <4DEF7775.5020407@fnarfbargle.com>
     [not found]                             ` <BANLkTin8dpbxWfSCG_VoOM_FMmqCkm2mJg@mail.gmail.com>
2011-06-13  5:32                               ` Durval Menezes
2011-06-13  5:56                         ` Durval Menezes
2011-06-07  8:52             ` John Robinson
2011-06-10 10:25               ` John Robinson
2011-06-11 22:35                 ` Durval Menezes

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