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Re: raid50 and 9TB volumes

To: Raz <raziebe@xxxxxxxxx>
Subject: Re: raid50 and 9TB volumes
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Mon, 16 Jul 2007 10:24:32 -0500
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <5d96567b0707160657x7b948026w89ef7c0241c41bf3@mail.gmail.com>
References: <5d96567b0707160542t2144c382mbfe3da92f0990694@mail.gmail.com> <20070716130140.GC31489@sgi.com> <5d96567b0707160657x7b948026w89ef7c0241c41bf3@mail.gmail.com>
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Raz wrote:

> Well you are right.  /proc/partitions  says:
>  ....
>     8   241  488384001 sdp1
>     9     1 3404964864 md1
>     9     2 3418684416 md2
>     9     3 6823647232 md3
> 
>  while xfs formats md3 as 9 TB.
>  If i am using LBD , what is the biggest size I can use on i386 ?

With LBD on, you *should* be able to get to 16TB (2^32 * 4096) in
general, assuming that everything in your IO path is clean.  (The 16TB
limit is due to page cache addressing on x86).

-Eric


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