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

From: Mikulas Patocka
Date: Mon Nov 10 2008 - 09:56:18 EST


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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