linux-kernel - Re: Queue upcall locking (was: [dm-devel] [RFC][PATCH] fix dm_any_congested() to properly sync up with suspend code path)

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Date:	Mon, 10 Nov 2008 09:55:55 -0500 (EST)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Christoph Hellwig <hch@...radead.org>,
	Chandra Seetharaman <sekharan@...ibm.com>,
	Alasdair G Kergon <agk@...hat.com>,
	dm-devel <dm-devel@...hat.com>, linux-kernel@...r.kernel.org,
	axboe@...nel.dk
Subject: Re: Queue upcall locking (was: [dm-devel] [RFC][PATCH] fix
 dm_any_congested() to properly sync up with suspend code path)

On Mon, 10 Nov 2008, Peter Zijlstra wrote:

> > If you have a physical disk that has many LVM volumes on it, you end up in 
> > a situation when disk congestion state change is reported to all the 
> > volumes. So it will create O(n) problem at the other side.
> 
> *sigh* I can almost understand why people want to use lvm to combine
> multiple disks, but why make the partition thing even worse...

To protect the services from each other --- so that mail storm won't blow 
user's directories, users blowing their space can't corrupt the system 
updates, logs are kept safely even if other partition overflows etc.

I just know some admins who prefer to have separate filesystems instead of 
quotas for this purpose.

Mikulas
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