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From: Zdenek Kabelac <zkabelac@redhat.com>
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Date: Mon, 2 Jan 2017 17:20:36 +0100
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Subject: Re: [linux-lvm] Two questions about lvm-cache
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Dne 2.1.2017 v 16:29 Raman Gupta napsal(a):
> On 02/01/17 10:15 AM, Zdenek Kabelac wrote:
>> Dne 29.12.2016 v 14:52 Raman Gupta napsal(a):
>>> I am trying out the lvmcache functionality. So far, everything looks
>>> great. I have two questions:
>>>
>>> 1) The man page of lvmcache states "With the --cachemode option, the
>>> cache mode can be set when creating a cache LV, or changed on an
>>> existing cache LV." However, I can't figure out the right command to
>>> change the cache mode on an existing LV.
>>
>>
>> Hi
>>
>>
>> 'change' of cachemode  is  'lvchange' operation
>
> Hmm, there is no mention of cachemode change in `lvchange` man page
> (nor a reference from `lvmcache` man page). Guessing at the syntax,
> still no luck:
>
> # lvchange --verbose --cachemode writeback vg_raid10/lv_var
> lvchange: unrecognized option '--cachemode'
>   Error during parsing of command line.
>


Please use some more recent version of lvm2  ( > 2.02.155)
The newer the better...

Regards

Zdenek