On Fri, 22 Nov 2013 18:52:27 -0500, Paul B. Henson <henson@xxxxxxx> wrote:
Ah, that's true; using raid at the lvm layer allows you to selectively
choose redundancy as opposed to dropping the entire pv on top of an
mdraid.
Not sure I understood that passage...
But in any event I'm working on a script I'm calling "md-3par" which will
create a number of chunklets (aka LV) from a set of PV (contained
naturally in a single VG) onto which to assemble a MD array of chosen
geometry and redundancy level. Of course one can then additionally layer
LVM, bcache, or (b)tier as desired. LVM is just a replacement for the
archaic and inflexible partition table, IMO. Granted snapshots and
thin-provisioning are nice to have.
I am disappointed that LVM is trying to expand into MD's territory. It's
bad enough they had the LVM 'mirror' (IMO a sad effort, pitifully slow,
and given it's unability to handle missing mirror members very much not
useful) and an interleaved 'striping'. Simple concat/extension of course
makes sense but the One True Faith of *nix is one simple tool to do one
job and ONLY that job to the best possible. If they want to pretend to be
ZFS-lite then just do ZFS already but keep it out of LVM. </rant>
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