[CentOS-virt] LVM mirror database to ramdisk

>  Ed Heron <Ed at heron-ent.com> wrote:
>   Yes, in a test environment, I am mirroring a Logical Volume with a RAM
> disk to increase the perceived speed of the disk.  I'm expecting to
> convert a live guest to this type of setup, this weekend.
>
>   I was asking 2 questions.
>         1. Should I expect a significant increase in speed in a real world
> environment?  With enough RAM, a good caching system will eventually do
> a similar function.  This is almost like pre-loading a cache.
>         2. Should I document the process for others?  I'm using CentOS 5 now,
> which is on it's way out, but I would update the documentation to
> include CentOS 7 when I upgrade my servers.
>

See this is where I was confused.  Would not the LVM mirror have to
sync all the time with the disk anyways?

Is there something about LVM mirroring that can handle disks of
different speeds?