[mythtv-users] Should I use LVM on this new raid?

Brian Foddy bfoddy at visi.com
Sat Sep 22 16:49:52 UTC 2007

On Saturday 22 September 2007, Brian Foddy wrote:
> On Saturday 22 September 2007, Bill Williamson wrote:
> > On 9/22/07, Brian Foddy <bfoddy at visi.com> wrote:
> > >Snipped complex raid/LVM setup questions
> >
> > Since it's not your boot drive I would SERIOUSLY consider using ZFS.
> > Read up on it, it's an excellent filesystem from SUN which has been
> > ported to FUSE (since it's not kernel compatible).
> >
> > It takes the place of mdadm and LVM AND your native filesystem
> > (XFS/ext3/JFS/etc).  It can do anything you can think of.  Yes, that
> > sounds silly, but it really is "that good" and getting better quite
> > quickly.  It's going to be included in the next OSX release, and will
> > likely be the default filesystem in next + 1.
> >
> > Example of a complex config that is easy to do in ZFS (and DOABLE with
> > mdadm + xfs + LVM but harder to manage):
> >
> > -4 1TB hard drives
> > -3 filesystems
> > FS1: 700GB raid0 for speed (media caching drive if doing video editing?)
> > FS2: 300GB raid1 for redundency (boot/system drive?)
> > FS3: 2TB raid 5/6/their own equiv (for hotswap style redundancy, your
> > recordings drive)
> >
> > It parcels out pieces of disk from the ZFS pool automatically and
> > figures out what stripes/blocks/etc it puts where to accomidate all of
> > that.  I'm a huge fan :)
> I'll look into it.  I'm starting to see some limitations to my original
> thinking.  First, not sure LVM will allow me to expand the
> physical volumes, which is I think what would be happening.
> There is a lot more here than I expected....

Unless I'm missing something, ZFS doesn't have a compatible license for
the linux kernel, hence hasn't been ported.  There is FUSE, apparently
a user mode implementation, but not sure I want to do down that road.


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