linux-kernel - Re: clustered MD

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Date:	Sun, 14 Jun 2015 17:19:31 -0500
From:	Goldwyn Rodrigues <rgoldwyn@...e.com>
To:	David Teigland <teigland@...hat.com>, Neil Brown <neilb@...e.de>
CC:	linux-kernel@...r.kernel.org
Subject: Re: clustered MD



On 06/12/2015 01:46 PM, David Teigland wrote:
> When a node fails, its dirty areas get special treatment from other nodes
> using the area_resyncing() function.  Should the suspend_list be created
> before any reads or writes from the file system are processed by md?  It
> seems to me that gfs journal recovery could read/write to dirty regions
> (from the failed node) before md was finished setting up the suspend_list.
> md could probably prevent that by using the recover_prep() dlm callback to
> set a flag that would block any i/o that arrived before the suspend_list
> was ready.
>
> .

Yes, we should call mddev_suspend() in recover_prep() and mddev_resume() 
after suspend_list is created. Thanks for pointing it out.

-- 
Goldwyn
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