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July 2007

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Subject:
From:
John Hearns <[log in to unmask]>
Reply To:
John Hearns <[log in to unmask]>
Date:
Fri, 27 Jul 2007 08:28:28 +0100
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Jon Peatfield wrote:
> 
> On the boxes we have with larger raid setups, we are lucky enough that 
> they can all chop up the raidset into <2TB chunks which get presented to 
> the OS as seperate disks, which we can then join back together with LVM...
> 
Jon, I absolutely back up what you say. Presenting logical volumes less 
than 2Tbytes then using LVM to join them back up into larger LVs is the 
way to go.

For information, I recently installed a 3ware 9650 card for a customer, 
and configured a RAID5 set on some 750Gbyte drives, which came to over 
2Tbytes. The customer did not want to use LVM. I found that cfdisk would 
  successfully partition the drive - the requirement was for a 1.6 Tbyte 
partition plus two other smaller partitions.
fdisk failed to understand the partition layout, and gave some very 
weird results. So I would advise using cfdisk if you are partitioning 
huge drives.



-- 
      John Hearns
      Senior HPC Engineer
      Streamline Computing,
      The Innovation Centre, Warwick Technology Park,
      Gallows Hill, Warwick CV34 6UW
      Office: 01926 623130 Mobile: 07841 231235

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