[linux-lvm] extend raid5 - how if possible?

[Christopher Jacoby]

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On Tue, Aug 18, 2020, 12:28 AM Heinz Mauelshagen <heinzm at redhat.com> wrote:

> On 8/15/20 10:57 AM, lejeczek wrote:
>
> Hi guys
>
> In hope that experts roam this list I want to ask if it is
> possible to extend raid5.
> If I wanted to be specific, raid created this way:
>
> $ lvcreate -n raid5.1 -l 100%pv --stripes 5 --stripe-size 8
> ST2000_front.0 /dev/sdj /dev/sdk /dev/sdn /dev/sdo /dev/sdp
> /dev/sdq
>
> You can see I try to be specific about hard disks here. I
> hope that later I can add more of exact same hard disk to
> the system and extend such raid5.
>
>
> As you consumed all capacity on those disks, you either got the option to
> extend using lvextend (though you don't need the same disk sizes but you'd
> need 6 more disks to be able to extend all the given raid5 stripes using
> lvextend)  -or-  you can lvconvert adding stripes to your given raid5 which
> will also grow the RaidLV size by the added stripe capacities.   In that
> later case of adding stripes, you'd have to deploy N additional disks (N =
> number of stripes to add) of the same or larger size than the ones you got.
>
> Mind, you could also convert to e.g. raid6 in case your resilience
> requirements change which'll require another disk to store parity blocks.
>
> Heinz
>
>
>
> many thanks, L.
>
>
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