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From: "Janne Heß" <janne+lvm@hess.ooo>
To: linux-lvm@redhat.com
Subject: [linux-lvm] RAID-less parity?
Date: Mon, 13 Jul 2020 16:34:52 +0200	[thread overview]
Message-ID: <1juzXg-0002Wp-5c@mx1.helsinki.tools> (raw)

Hello everyone,

I'm currently testing dm-integrity and its use with LVM.
For RAID 1,5,6 LVM should just be able to recover the RAID when integrity fails (and the block device returns a read error).
However some of my systems are single-disk systems. For those, RAIDs are not possible so I was thinking if LVM has some support for single-PV setups with parity on the same PV.
While this is probably a niche feature right now, I can see other projects like Stratis benefit from the integrity checks provided by dm-integrity (and dm-crypt in the future) to detect (and thanks to parity fix) bit rots.
So is there any way to get a parity setup with the current state of LVM? I was thinking of a RAID-4 with one PV but the current tooling (more specifically lvcreate) doesn't let me do that.

Thanks and regards
Janne

             reply	other threads:[~2020-07-13 14:51 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-13 14:34 Janne Heß [this message]
2020-07-14 15:15 ` [linux-lvm] RAID-less parity? Gionatan Danti
2020-07-14 16:05 ` David Teigland
2020-07-14 20:32   ` Gionatan Danti
2020-07-30 20:49   ` Janne Heß

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