[Fedora-xen] Xen - large virtual machines

[Ask Bjørn Hansen]

On Sep 14, 2008, at 9:16, Alex Davies wrote:

> Two of our virtual machines require >30T of storage, and no  
> redundancy, so we will run one VM on each Thumper (with local  
> storage).


Are you replacing the 500GB disks with 1TB disks in the Thumbers?

Unless "no redundancy" really truly means "it's fine if it breaks a  
lot", then please keep in mind the numbers.  40+ disks are that many  
times more likely to fail than one disk.  Don't just stripe all the  
disks into one big volume.  Either keep them as separate devices so  
they fail individually or use RAID5 or (better) RAID6 and keep plenty  
spares ready.  Your plan of doing RAID in sets of 8 or so disks is  
probably about right.


  - ask

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