CentOS - Jan 2007 - performance lost in using a software raid array with only 1 disk

Is there any performance lost in using a software raid array
with only 1 disk?

I was wanting to use the mdadm monitoring tools to monitor the
machines single disk drive for failures and such. Is there any
performance hit for such a setup?

Some machines have RAID some machines dont (for me) and
I was thinking about a common setup.

Also then if I want in the future I can actually just add the second
disk and now I have RAID.

Jerry

On 31/01/07, Jerry Geis <geisj at pagestation.com>
wrote:
> Is there any performance lost in using a software raid array
> with only 1 disk?
IMHO a single disk in array should not make it faster or slower.
However I would look at this thread with interest for answers from
Guru's
-- 
Regards,
Sudev Barar

Jerry Geis wrote:
> Is there any performance lost in using a software raid array
> with only 1 disk?
> 
> I was wanting to use the mdadm monitoring tools to monitor the
> machines single disk drive for failures and such. Is there any
> performance hit for such a setup?
I assume you are talking about RAID1 arrays. No, you won't. Rather, you 
will get a performance loss if you carve up your disk into more than one 
partition.
> 
> Some machines have RAID some machines dont (for me) and
> I was thinking about a common setup.
> 
> Also then if I want in the future I can actually just add the second
> disk and now I have RAID.
I don't think you can actually build an array with missing disks.

On Wed, 31 Jan 2007 09:41:42 -0500
  Jerry Geis <geisj at pagestation.com> wrote:
>Is there any performance lost in using a software raid array
>with only 1 disk?
>
>I was wanting to use the mdadm monitoring tools to monitor the
>machines single disk drive for failures and such. Is there any
>performance hit for such a setup?
>
For monitor drive health I would think smartd would be a better 
choice. 
>Some machines have RAID some machines dont (for me) and
>I was thinking about a common setup.
>
>Also then if I want in the future I can actually just add the second
>disk and now I have RAID.
This is not a bad idea if you plan on actually upgrading running 
machines non-RAID machines to RAID 1.
>
>Jerry
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Dennis Willson