[linux-lvm] LVM - Combining different hard drives with different specs ?

[linux-lvm] LVM - Combining different hard drives with different specs ?

[Lee Gold]

Hi,

I have a 100GB IDE HD that will fill up soon. I have a 1TB SATA drive I
want to add. I am using Ubuntu Server 10.04, I installed the existing
100GB drive using LVM, only a single initial HD. I aim to increase my
storage capacity under the server's document root /var/www... Before I
get started hopefully asking intelligent questions and giving the needed
information to help you help me, I wanted to ask this initial question:

These two drives are different, they surely have different performance.
Will this be a problem? If it was RAID I think matching drives are
needed. I just want to add storage capacity with acceptable performance
for a local in-house server.

Thanks,

Lee G.



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Re: [linux-lvm] LVM - Combining different hard drives with different specs ?

[Ray Morris]

Not a problem. If the drives have different performance, 
some files may have different performance, but that's 
actually nothing new because the outside of a disk platter
is faster than the inner tracks. So whether you have one 
disk, two matched disks, or two mismatched disks you'll 
always have different areas with different performance.
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On Sat, 21 May 2011 15:38:23 -0700
"Lee Gold" <leegold@operamail.com> wrote:

> 
> Hi,
> 
> I have a 100GB IDE HD that will fill up soon. I have a 1TB SATA drive
> I want to add. I am using Ubuntu Server 10.04, I installed the
> existing 100GB drive using LVM, only a single initial HD. I aim to
> increase my storage capacity under the server's document
> root /var/www... Before I get started hopefully asking intelligent
> questions and giving the needed information to help you help me, I
> wanted to ask this initial question:
> 
> These two drives are different, they surely have different
> performance. Will this be a problem? If it was RAID I think matching
> drives are needed. I just want to add storage capacity with
> acceptable performance for a local in-house server.
> 
> Thanks,
> 
> Lee G.
> 
> 
> 

Re: [linux-lvm] LVM - Combining different hard drives with different specs ?

[Stuart D. Gathman]

On Sat, 21 May 2011, Lee Gold wrote:

> I have a 100GB IDE HD that will fill up soon. I have a 1TB SATA drive I
> want to add. I am using Ubuntu Server 10.04, I installed the existing
> 100GB drive using LVM, only a single initial HD. I aim to increase my
> storage capacity under the server's document root /var/www... Before I
> get started hopefully asking intelligent questions and giving the needed
> information to help you help me, I wanted to ask this initial question:
>
> These two drives are different, they surely have different performance.
> Will this be a problem? If it was RAID I think matching drives are
> needed. I just want to add storage capacity with acceptable performance
> for a local in-house server.

Even for RAID, they don't have to match.  For RAID1, write speed will 
follow the slowest drive.

--
 	      Stuart D. Gathman <stuart@bmsi.com>
     Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.

Re: [linux-lvm] LVM - Combining different hard drives with different specs ?

[James Hawtin]

Stuart D. Gathman wrote:
>
> Even for RAID, they don't have to match.  For RAID1, write speed will 
> follow the slowest drive.
Though combining lower and higher speed drives can increase the wear 
rate on the larger drive (that is atleast what we found when a 10k and 
15k had to be used in a mirror (due to spare drive availablity).

James