From mboxrd@z Thu Jan  1 00:00:00 1970
From: Zdenek Kabelac <zkabelac@redhat.com>
Subject: Re: mirrored device with thousand of mappingtableentries
Date: Mon, 28 Feb 2011 14:38:46 +0100
Message-ID: <4D6BA566.1050305@redhat.com>
References: <E04C10E329E0CD40816C9C17AE53BBD3018639C2@kit001.kaminario.local>	<20110228114801.GZ3626@agk-dp.fab.redhat.com>	<E04C10E329E0CD40816C9C17AE53BBD3018639CE@kit001.kaminario.local>	<20110228121149.GA3626@agk-dp.fab.redhat.com>	<E04C10E329E0CD40816C9C17AE53BBD3018639D7@kit001.kaminario.local>	<20110228131028.GB3626@agk-dp.fab.redhat.com>
	<E04C10E329E0CD40816C9C17AE53BBD301863A00@kit001.kaminario.local>
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Dne 28.2.2011 14:13, Eli Malul napsal(a):
> 
> OK, I will try that and check the implications of that, thanks!!
> 
> But, do you know why having 10,000 extents is causing this overwhelming
> memory usage?
> 

If you really need that many devices - be also sure
you have disabled this kernel config option:

CONFIG_BLK_DEV_INTEGRITY


For some reason it consumes massive amount of memory.
Other than that - you should count with  64KB per device usually.

Zdenek