On 07/08/2021 19:52, Roberto Ragusa wrote:
On 8/7/21 4:19 PM, lejeczek via users wrote:
$ -> lvcreate --type raid0 -i 4 -I 16 -n 0 -l 90%pv
dellH200.InternalB /dev/sd{c..f}
and so on...
The original poster wants to replace a 2 disk RAID-1 with
a bigger 2 disk RAID-1,
that is something very different than your suggestion to
have a 4 disk RAID-0.
It is _not_ any specific suggestion and you know if read
what I said.
It is just an example to show how easy it is to use LVM2 for
raids.
The first link mentioned by José María Terry Jiménez is a
good procedure for
what we want to achieve.
I would only point out that everybody tends to remove one
of the drive and then
add a new one, while you can instead grow the RAID-1 to 3
disks, add your new
drive, then remove the old one, then add the second new
one and remove the second
old one, then (un)grow back to 2 drives and finally resize
md and pv.
In this way your array never works in degrade 1-disk mode.
Of course nobody stops you from going to 4 disk RAID-1
(add, add, remove, remove).
I usually do not create RAID-1 on the entire disk space, I
prefer to partition
into fixed size fragments (e.g. 4 470GB on a 2TB disk) and
create many RAID-1
out of partition couples to use as pv. In this way the new
shiny 4TB disks are
just giving me 8 additional 470GB pieces, I can create the
new RAID-1s and pvs,
add them to the vg and then use pvmove to decide where the
data should be,
eventually pvremoving the RAID-1 pieces on the old disks
if I'm planning to
physically remove them.
Everything can be done online, and not even a powerloss is
able to do any damage.
Done this many many times on big storage servers.
Regards.
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