Re: RAID 5 with different size disks
- From: jludwig <wralphie@xxxxxxxxxxx>
- Date: Fri, 3 Feb 2006 09:01:41 -0500
On Friday 03 February 2006 00:11, Jerel Harwood wrote:
Fajar Priyanto wrote:
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.
Gordon Messmer replied:
No, it isn't. RAID5, by design, requires units of the same size.
Depending on what you are using to create the RAID5 (software vs.
hardware.) It is possible to create a raid5 with the disk configuration you
spec, but due to the nature of raid5 you will be wasting massive amounts of
disk space as the max amount of disk space it will use per disk is directly
relational to the smallest sized disk you use. Thus it will only use 9GB
of the 36, 9GB of the 40 and 9GB of the 80GB drives each.
You will only get 4 x 9GB = 36GB of disk space (disk 5 is used for Parity)
Instead you could mirror (RAID1) the 2 80GB drives and put your critical
data on them.
-J Harwood
As far as different size drives from MDADM(8) ;
DESCRIPTION
RAID devices are virtual devices created from two or more real block
devices. This allows multiple devices (typically disk drives or partitions
there-of) to be combined into a single device to hold (for example) a single
filesystem.
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