[CentOS] Seeking pointers to info about LVM migration and performance

On 7/7/07, Johnny Hughes <mailing-lists at hughesjr.com> wrote:
> Bart Schaefer wrote:
> > - What kind of performance can we expect from an LVM group as compared
> > to mounting the RAID array directly?
>
> OK, the answer to this question is ...
>
> RAID and LVM can be used together, or individually.

Thanks for confirming that, though in this case it's a hardware RAID
so I wouldn't expect LVM to need to treat it as anything other than
big disk.

> If you have 2 or more drives that are the same in the machine, you can
> "Stripe" your LVM.

Could you clarify "that are the same"?  The primary point of this
excercise is to make the filesystem resizable.  It's already
impossible to buy exactly the configuration of new hardware that's
already attached; we wouldn't want to be limited to adding identical
extents every time we expanded the storage.

> LVM done this way is quite fast ... but obviously you would need to
> provide another way to protect your data.

Presumably using hardware RAIDs as the physical volumes would take care of that.

Thanks for the information.