[linux-lvm] extend raid5 - how if possible?
heinzm at redhat.com
Mon Aug 17 11:29:35 UTC 2020
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
> 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.
> many thanks, L.
> linux-lvm mailing list
> linux-lvm at redhat.com
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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