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
raid0).
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
intact?)
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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