[CentOS] 4 X 500 gb drives - best software raid config for a backup server?

[Rob Kampen]

Dnk,
I use two drives with linux raid 1 sets for the OS for all my CentOS 
machines, drives are cheaper than my rebuild time and hassle.
I actually use 3 partitions mirrored on each: /boot of 100M; swap of 2 
time RAM (disk is cheap);  70G as /, then the remainder is extended 
partition for lvm - in this case the extended partition is not mirrored 
as the contents are for mythTV recordings that I don't mind loosing. I 
have a HD TV card that takes 5G per hour of recording so space matters 
more than redundancy - also use xfs on this lvm part as it seems to work 
better for huge files.
In your case I would set up both the raid 1 sets, put lvm volumes in 
place and allocate as needed for the mount points you want to have. 
Because you are using lvm, if you get the allocation wrong it can be 
remedied without too much hassle.
Hope this helps.
Rob

dnk wrote:
>
> On 17-Feb-09, at 2:08 PM, Rob Kampen wrote:
>
>> Linux software raid works fine and I use this recipe
>> http://linux-raid.osdl.org/index.php/Partitioning_RAID_/_LVM_on_RAID
>> If you can afford a proper hardware raid controller for raid 6, that 
>> would be of better performance than linux software raid, other than 
>> that I have found performance of linux based md using raid 1 to work 
>> fine.
>
> Rob,
>
> So are you using 4 drives, and making two different raid 1 (2 drives 
> each), then joining them via LVM?
>
> d
>
>
>
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