From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: Guess the size of a RAID{5,6} device
Date: Sat, 12 Apr 2014 18:24:48 +1000
Message-ID: <20140412182448.3de6d253@notabene.brown>
References: <5347A58B.2060308@gmail.com>
	<20140412095049.6cce32a6@notabene.brown>
	<5348F550.2040609@gmail.com>
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To: Francis Moreau <francis.moro@gmail.com>
Cc: linux-raid <linux-raid@vger.kernel.org>
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On Sat, 12 Apr 2014 10:12:00 +0200 Francis Moreau <francis.moro@gmail.com>
wrote:

> Hello Neil,
>=20
> On 04/12/2014 01:50 AM, NeilBrown wrote:
> > On Fri, 11 Apr 2014 10:19:23 +0200 Francis Moreau <francis.moro@gmail.c=
om>
> > wrote:
> >=20
> >> Hello,
> >>
> >> I'd like to know if it's possible to get the size of a RAID{5,6} which
> >> is not created yet but the size of the partitions which will make up t=
he
> >> array are.
> >=20
> > How precise does the "guess" need to be?
> >=20
>=20
> I just need an approximation in order to report to user some information
> about the (raided) partition my tool is about to create.
>=20
> > If you subtract about 128Meg from the size of the partitions, round dow=
n the
>=20
> Just to be sure the size of the partitions is equal to the min size of
> all partitions ?

Correct.

NeilBrown


>=20
> > a multiple of the chunk size then multiply by the number of data disks,=
 you
> > should come quite close.
>=20
> Thanks, that should do the trick.


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