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Re: RAID 5 with different size disks



On Fri, 2006-02-03 at 09:37 +0700, Fajar Priyanto wrote:
> Hi all,
> Is it possible to setup a RAID 5 array using different size disks? Such as hda 
> 9GB, hdb 36GB, hdc 40GB, hdd 80GB, hde 80GB.
> What are the impact and consequences?

With software raid 5, you can use different size disks.
The requirement is that you create virtual devices (raid partitions) for
use, and all those must be the same size.
 
For example, the 9gb +36gb +40gb drives could be used to create 9
virtual raid devices of 9gb each and you would have 8 x 9 -> 72gb of
raid array.
This is not necessarily the best way to go since 4 of those virtual raid
devices would be on a single physical device.

However, you could create multiple raid arrays as you suggest and would
still have more than 80gb of unused space with each array spread across
several physical disks..

device 1  9gb on each hda, hdb, hdc, hdd, hde -> 5 X 9gb -> 36gb of
usable space
device 2  27gb on each hdb, hdc, hdd, hde -> 4 x 27gb -> 81gb usable
space.

this would leave about 4gb on hdc and 44gb on each of hdd & hde
unallocated.

> Thank you very much,
> -- 
> Fajar Priyanto | Reg'd Linux User #327841 | Linux tutorial 
> http://linux2.arinet.org
> 09:36:07 up 1:42, 2.6.14-1.1653_FC4 GNU/Linux 
> Let's use OpenOffice. http://www.openoffice.org
> 


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