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Re: creating a new 80 TB XFS

To: xfs@xxxxxxxxxxx
Subject: Re: creating a new 80 TB XFS
From: Richard Ems <richard.ems@xxxxxxxxxxxxxxxxx>
Date: Mon, 27 Feb 2012 13:20:00 +0100
In-reply-to: <2897177.rcH5T34bLh@saturn>
References: <4F478818.4050803@xxxxxxxxxxxxxxxxx> <2897177.rcH5T34bLh@saturn>
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On 02/27/2012 12:56 PM, Michael Monnerie wrote:
> Am Freitag, 24. Februar 2012, 13:52:40 schrieb Richard Ems:
>> The raw storage space will then be 28 x 3 TB = 84 TB.
> 
> Please remember that it will be 2,79 TiB per drive, that's 78 TiB 
> overall. So it's missing 6 TB in reality, depending on how you 
> calculated the source space you have and backup space you need. In 
> Multi-TB environments people still are surprised by the big "rounding 
> error" from harddisk TB to real TiB. And I've had customers who couldn't 
> even do their first backup, as the backup system was full already. They 
> calculated backup space only for one backup, and without the TB->TiB 
> conversion.

Thanks Michael, I have alrady taken this into account.

We have now about 40 TB to backup and about 60 TB max. And there is
space for 32 more HDDs in the backup system, which we will add later as
needed.

Richard

-- 
Richard Ems       mail: Richard.Ems@xxxxxxxxxxxxxxxxx

Cape Horn Engineering S.L.
C/ Dr. J.J. Dómine 1, 5º piso
46011 Valencia
Tel : +34 96 3242923 / Fax 924
http://www.cape-horn-eng.com

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