[linux-lvm] raid10 to raid what? - convert
peljasz at yahoo.co.uk
Wed Oct 18 15:52:01 UTC 2017
On 17/10/17 21:57, Stuart D. Gathman wrote:
> You still haven't said what you are trying to accomplish.
> I wouldn't
> have bothered responding to such a vague question until
> you provided
> some tantalizing clues. Until your lastest clues, I would
> have advised
> using rsync or dd to copy your data to a new volume. But
> now it sounds
> like you ran out of budget for another disk, or need to
> minimize down
> time, and want to reconfigure in place.
gee, with this much enthusiasm I can imagine you solve many
problems, however I can also imagine at the same time you
create also problems that do not exists.
but honestly & truthfully appreciate this enthusiasm & help.
> First off, raid10 is a linux specialty (I didn't know LVM
> supported it,
> thanks!), and is not the same as raid1+0 (raid1 on top of
> However, your previous clue tells us that probably you
> have at least 4
> disks in your raid10. So you should be able to remove 2
> legs from the
> raid10, and still have the equivalent of a raid0. But
> this is not
> certain as raid10 works perfectly well with 2 or 3 disks,
> including the
> redundancy. In any case, you can remove at least 1 leg
> from your
> raid10. Be sure to backup first in any case.
> Now that you've cut the disk used in half (and your data
> is precariously
> dependent on the health of *both* underlying physical
> disks), what did
> you want to do next? Maybe you just want to create a
> different kind of
> raid with the released space and do that rsync or dd?
I'm still looking for an answer - if it's possible then how
to split raid10 into two raid0 LVs(with perhaps having data
I've been fiddling with --splitmirrors but either I got it
wrong or I didn't and command just fails.
More than contemplating theories and general knowledge on
raid I'd prise a lot succinct, concrete info, actuall
experience of "howto".
But I shall now try my fiddling virtualized way, problem at
hand I had, I had to solve different way completely.
> On Tue, 17 Oct 2017, lejeczek wrote:
>> no other raids but LVM's own.
>> not much in configuration, unless I misunderstand,
>> question I'm posing is simple - is it possible to
>> convert/split lvm raid10 LV into two raid0 LVs? (here one
>> thing comes to mind: data stays intact?) Or raid10 LV to
>> any other raid?
>> As I sroogled I saw there is "mirror spitting" but term
>> raid10 does not appear in that context, or I failed to
>> find it.
>> But man pages also mention, with regards to raid takeover:
>> · between striped/raid0 and raid10.
>> So it sounds like possible(so no other raid levels but
>> these two), only might be intricate process/procedure,
>> which is not documented, or again, I failed to find it.
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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