* [linux-lvm] howto cache a thinpool-device?
@ 2014-08-09 13:43 Oliver Rath
2014-08-09 16:26 ` Oliver Rath
0 siblings, 1 reply; 3+ messages in thread
From: Oliver Rath @ 2014-08-09 13:43 UTC (permalink / raw)
To: LVM general discussion and development
Hi list,
Im playing around with the new cache options. Ive created a lvm-device
on my cache-disk named lvx-cache (vg is dmivg). Additionally Ive created
a thinpool-device named winthinpool.
Now i wanted to use my cache-device to cache my thinpool-lvm, but this
doesnt work:
~# lvconvert --type cache --cachepool dmivg/lvx_cache dmivg/winthinpool
Can't cache thin-pool volume dmivg/winthinpool.
isnt is possible to cache a thinpool-device?
Tfh!
Oliver
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [linux-lvm] howto cache a thinpool-device?
2014-08-09 13:43 [linux-lvm] howto cache a thinpool-device? Oliver Rath
@ 2014-08-09 16:26 ` Oliver Rath
2014-08-19 23:34 ` Brassow Jonathan
0 siblings, 1 reply; 3+ messages in thread
From: Oliver Rath @ 2014-08-09 16:26 UTC (permalink / raw)
To: linux-lvm
Hi list,
what now worked:
- creating a cached data-lv
- creating a non-cached meta-lv
- converting data-lv to a thinpool-device with meta-lv as metadata
what not: doing the same thing with a cached meta-lv. Does this make sense?
Is the metadata already cached by lvm-logic? Do i have a cache thinpool
(with non-cached metadata) with the used way?
Tfh!
Oliver
Am 09.08.2014 um 15:43 schrieb Oliver Rath:
> Hi list,
>
> Im playing around with the new cache options. Ive created a lvm-device
> on my cache-disk named lvx-cache (vg is dmivg). Additionally Ive created
> a thinpool-device named winthinpool.
>
> Now i wanted to use my cache-device to cache my thinpool-lvm, but this
> doesnt work:
>
> ~# lvconvert --type cache --cachepool dmivg/lvx_cache dmivg/winthinpool
> Can't cache thin-pool volume dmivg/winthinpool.
>
> isnt is possible to cache a thinpool-device?
>
> Tfh!
> Oliver
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [linux-lvm] howto cache a thinpool-device?
2014-08-09 16:26 ` Oliver Rath
@ 2014-08-19 23:34 ` Brassow Jonathan
0 siblings, 0 replies; 3+ messages in thread
From: Brassow Jonathan @ 2014-08-19 23:34 UTC (permalink / raw)
To: LVM general discussion and development
If it was me, I would put the thinMetaLV directly on the fast device (because it is small) and I would cache the thinDataLV.
Remember that some of what you are doing is pretty cutting edge. I wouldn't yet use caching + thin in production yet.
Also, consider making your thin devices redundant (if they are not already via backend storage).
brassow
On Aug 9, 2014, at 11:26 AM, Oliver Rath wrote:
> Hi list,
>
> what now worked:
>
> - creating a cached data-lv
> - creating a non-cached meta-lv
> - converting data-lv to a thinpool-device with meta-lv as metadata
>
> what not: doing the same thing with a cached meta-lv. Does this make sense?
>
> Is the metadata already cached by lvm-logic? Do i have a cache thinpool
> (with non-cached metadata) with the used way?
>
> Tfh!
> Oliver
>
>
> Am 09.08.2014 um 15:43 schrieb Oliver Rath:
>> Hi list,
>>
>> Im playing around with the new cache options. Ive created a lvm-device
>> on my cache-disk named lvx-cache (vg is dmivg). Additionally Ive created
>> a thinpool-device named winthinpool.
>>
>> Now i wanted to use my cache-device to cache my thinpool-lvm, but this
>> doesnt work:
>>
>> ~# lvconvert --type cache --cachepool dmivg/lvx_cache dmivg/winthinpool
>> Can't cache thin-pool volume dmivg/winthinpool.
>>
>> isnt is possible to cache a thinpool-device?
>>
>> Tfh!
>> Oliver
>>
>> _______________________________________________
>> linux-lvm mailing list
>> linux-lvm@redhat.com
>> https://www.redhat.com/mailman/listinfo/linux-lvm
>> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2014-08-19 23:34 UTC | newest]
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2014-08-09 13:43 [linux-lvm] howto cache a thinpool-device? Oliver Rath
2014-08-09 16:26 ` Oliver Rath
2014-08-19 23:34 ` Brassow Jonathan
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