[CentOS] Multiple RAID support in CentOS?

Ian Blackwell ian at ikel.id.au
Sat Jan 30 02:09:51 UTC 2010


On 30/01/2010 12:09 PM, Victor Padro wrote:
> Hello,
>
> I was wondering if someone could help me, 
I'll try...
> I want to use one array with the 2 500GB HDDs in RAID1 for the OS and
> for some VMs, 
That will work OK.
> and the other 4 1TB HDDs I want to create an array in
> RAID5 or RAID10 for file sharing across my home Network.
>   
You can use these disks in a RAID5 array, but not RAID10.  I fairly sure
you need more than 4.  RAID10 is mirrored, so you only have "2" disks in
the array, which isn't enough for parity/striping stuff.  You need at
least "3", which would mean 6 disks for RAID10.

Having said that, I'm assuming you want to use the entire hard disk as a
participant in an array.  You could create 2 x 500Gb partions on each
disk and then you have 8 x 500Gb partitions to use in a RAID10 array. 
This approach sacrifices some redundancy though.  If a disk dies
entirely, then you will lose two participants in the RAID array, which
may or may not be catastrophic - it depends on what you put where...
> I found a guide but it's a little bit outdated and it's for Debian...
>
> Do you have any other pointer I can read/use?
>   
http://wiki.centos.org/HowTos/SoftwareRAIDonCentOS5

I've mostly installed RAID arrays at install time, which you'll need to
do as well if you want to put the OS on a RAID1 array.
>
> TIA.
>
>   
Ian


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