linux-kernel - Re: [patch] raid1: allow user to force reads from a specific disk

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Message-ID: <17622.35724.43741.529875@cse.unsw.edu.au>
Date:	Mon, 7 Aug 2006 10:38:36 +1000
From:	Neil Brown <neilb@...e.de>
To:	Chuck Ebbert <76306.1226@...puserve.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-raid <linux-raid@...r.kernel.org>
Subject: Re: [patch] raid1: allow user to force reads from a specific disk

On Sunday August 6, 76306.1226@...puserve.com wrote:
> Allow user to force raid1 to read all data from a given disk.
> This lets users do integrity checking by comparing results
> from reading different disks.  If at any time the system finds
> it cannot read from the given disk it resets the disk number
> to -1, the default, which means to balance reads.

Could say a little bit more about why you want this?

You could get nearly the same situation be setting the other drives to
write-mostly. 

And the more thorough integrity check is available via
   echo check > /sys/block/mdX/md/sync_action

NeilBrown
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