[linux-lvm] lvmcache on non-lvm source?

[linux-lvm] lvmcache on non-lvm source?

[Gionatan Danti]

Hi all,
I have a question: can lvmcache be used to cache non-lvm source (ie: a 
raw block device)?

 From the lvmcache man page I would say no; however, a direct 
confirmation will be helpful.

Thanks.

-- 
Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it
email: g.danti@assyoma.it - info@assyoma.it
GPG public key ID: FF5F32A8

Re: [linux-lvm] lvmcache on non-lvm source?

[Zdenek Kabelac]

Dne 14. 01. 20 v 9:21 Gionatan Danti napsal(a):
> Hi all,
> I have a question: can lvmcache be used to cache non-lvm source (ie: a raw 
> block device)?
> 
>  From the lvmcache man page I would say no; however, a direct confirmation 
> will be helpful.
> 

Hi

You can't use lvm2 on 'raw' device - we do require PV headers to stay correct.

BUT

Clearly you can use 'dm-cache' target with 'dmsetup' utility and maintain the 
correctness of devices & activation yourself.

See: linux/Documentation/admin-guide/device-mapper/
(or simply google it)  how to use individual targets with just dmsetup


Regard

Zdenek

Re: [linux-lvm] lvmcache on non-lvm source?

[Gionatan Danti]

On 14/01/20 10:17, Zdenek Kabelac wrote:
> Hi
> 
> You can't use lvm2 on 'raw' device - we do require PV headers to stay 
> correct.
> 
> BUT
> 
> Clearly you can use 'dm-cache' target with 'dmsetup' utility and 
> maintain the correctness of devices & activation yourself.
> 
> See: linux/Documentation/admin-guide/device-mapper/
> (or simply google it)� how to use individual targets with just dmsetup
> 
> 
> Regard
> 
> Zdenek
> 

Hi Zdenek, thank you for the clear reply.

I know I can directly use dm-cache but, from a support standpoint, it 
would really like to avoid it.

I would rather create a PV on the raw block device.
Thanks.

-- 
Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it
email: g.danti@assyoma.it - info@assyoma.it
GPG public key ID: FF5F32A8