LVM *was* Re: [mythtv-users] Highest number of simultaneous streams recorded?

[Alex Brekken]

Thanks Brandon, that makes sense. For a masterbackend server that will
probably have at most 2 clients, I don't get the feeling that striping the
drives is necessary from a performance standpoint. I'm still trying to
decide how to tackle the redundancy/backup issue. I'm wondering if doing
this via RAID is overkill.... Rather than introduce that complication maybe
I should just manually back the drives up every so often.

On 10/17/05, Brandon Beattie <brandon+myth at linuxis.us> wrote:
>
> On Fri, Oct 14, 2005 at 03:45:16PM -0500, Alex Brekken wrote:
> > If one wanted redundancy only (is that RAID-0??) then I take it you
> would
> > skip LVM entirely, correct? - IOW, are the 2 mutually exclusive or can
> you
> > use LVM with RAID? The reason I ask is because I'm starting to put
> together
> > some plans to build a master backend server (currently I have a
> > frontend/backend combo) which will not only house myth and it's
> recordings,
> > but also all of my music and pictures/videos of the kids. (the latter of
> > which I would want the redundancy in case of a drive failure).
>
> Raid 0 is striping for performance but no redundancy. Any other raid
> level (2,3,4,5,10) does redundancy. LVM basically gives you virtual
> partitions on top of anything that's set as an LVM partition type via
> fdisk. Some people use LVM ontop of raid. Someone may do raid 5 for
> redunancy and use LVM on top to allow them to shrink and grow virtual
> partitions as they want to move space around for mount points, but still
> have redunancy (Since LVM doesn't do redundancy). The only thing like
> raid LVM does is striping - but you can't resize a striped LVM partion,
> so LVM striping and Raid 0 are somewhat alike.
>
> --Brandon
>
>
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