[Beowulf] Problem with Single RAID disk larger than 2TB and Linux

Guy Coates gmpc at sanger.ac.uk
Wed Oct 3 12:03:29 EDT 2007


Luns over 2TB are a bad idea. There are just too many reasons why they might not
work, and trying to track down the right one is a pain.

Your workaround to use the LVM to stripe 3x1TB luns together is the way to go.
(You really want to use LVM anyhow, as  trying to do SAN storage without it is a
pain.)

You've covered the usual Gotchas with 2TB luns (dos partition tables and 32 bit
kernels),  so I'd suspect your storage array.  Check with Hitachi that the array
supports creating luns over 2TB. Many don't, and for maximum confusion, some
allow you to create >2TB luns, even though you  can't subsequently use them.

Cheers,

Guy

-- 
Dr. Guy Coates,  Informatics System Group
The Wellcome Trust Sanger Institute, Hinxton, Cambridge, CB10 1HH, UK
Tel: +44 (0)1223 834244 x 6925
Fax: +44 (0)1223 496802


-- 
 The Wellcome Trust Sanger Institute is operated by Genome Research 
 Limited, a charity registered in England with number 1021457 and a 
 company registered in England with number 2742969, whose registered 
 office is 215 Euston Road, London, NW1 2BE. 
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