[linux-lvm] raidintegrity on non top level LVs

[linux-lvm] raidintegrity on non top level LVs

[ajs124]

Hi,

I've been wondering. Why does lvconvert not allow me to add raid
integrity to LVs that are not top level?
It only says "Integrity can only be added to top level raid LV."

Skimming the commit that added this [1] did not provide me with
an answer, so I thought I'd ask here.

Best Regards

[1]: https://sourceware.org/git/?p=lvm2.git;a=commitdiff;h=d9e8895a96539d75166c0f74e58f5ed4e729e551

_______________________________________________
linux-lvm mailing list
linux-lvm@redhat.com
https://listman.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

Re: [linux-lvm] raidintegrity on non top level LVs

[David Teigland]

On Tue, Aug 02, 2022 at 04:27:53PM +0200, ajs124 wrote:
> Hi,
> 
> I've been wondering. Why does lvconvert not allow me to add raid
> integrity to LVs that are not top level?
> It only says "Integrity can only be added to top level raid LV."
> 
> Skimming the commit that added this [1] did not provide me with
> an answer, so I thought I'd ask here.

Hi, good question, I think it was just an effort to limit the scope of the
feature initially.  Over time we can possibly expand the scope after
seeing how things were working technically, and the experience of users.
I'm curious to know what configuration you're trying, and if you have any
experience using raid+integrity otherwise.

Dave
_______________________________________________
linux-lvm mailing list
linux-lvm@redhat.com
https://listman.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

Re: [linux-lvm] raidintegrity on non top level LVs

[ajs124]

On Wed, 3 Aug 2022 10:15:54 -0500
David Teigland <teigland@redhat.com> wrote:

> On Tue, Aug 02, 2022 at 04:27:53PM +0200, ajs124 wrote:
> > Hi,
> > 
> > I've been wondering. Why does lvconvert not allow me to add raid
> > integrity to LVs that are not top level?
> > It only says "Integrity can only be added to top level raid LV."
> > 
> > Skimming the commit that added this [1] did not provide me with
> > an answer, so I thought I'd ask here.  
> 
> Hi, good question, I think it was just an effort to limit the scope of the
> feature initially.  Over time we can possibly expand the scope after
> seeing how things were working technically, and the experience of users.
> I'm curious to know what configuration you're trying, and if you have any
> experience using raid+integrity otherwise.
> 
> Dave

Hi,

we're using a thin pool on top of two raid lvs for thinpool metadata
and data and I tried adding integrity to that.

We don't have much experience with raid+integrity, just a handful of
systems, which have been running fine. They're not particularly
performance critical and we don't have much data on how exactly they
behave.

The reason why I started looking into this again is because I observed
some mismatched sectors on a host, where all drives seem fine and I'd
like to have integrity to maybe figure out if any of the drives are
actually faulty.

ajs124

_______________________________________________
linux-lvm mailing list
linux-lvm@redhat.com
https://listman.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/