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Re: [lvm-devel] [PATCH V2 0/2] Add thin lv and thin pool creation support



Tony Asleson <tasleson redhat com> writes:

> On 02/01/2013 12:08 AM, M. Mohan Kumar wrote:
>> Tony Asleson <tasleson redhat com> writes:
>>> One option would be to change the type to a signed integer and change
>>> the meaning from number of blocks free to percentage free and then treat
>>> -1 as pick a sane default.  Thus 0 would be no events and 30 would
>>> indicate when 30% blocks free is remaining to generate an event.  We
>>> could also use an unsigned value and use 100 as please pick a sane
>>> default as this value and values close to it really wouldn't make much
>>> sense.
>> 
>> IMHO specifying the % in threshold is a good idea. You suggest to assume some
>> default threshold for newly created thin pool if user is not passing
>> anything. May be we can document this in lvm2app.h mentioning if '0'
>> passed as percentage it will be treated as the default thresold and 100%
>> means no event will be generated. What do you think about this policy?
>
> This would be fine too.  As long as we clearly document what the value
> represents and what the special values which denote disable and select
> default we should be good.
>
> Do we know what a reasonable threshold value should be?

I am not sure about the threshold value, should it bring it to dm folks?


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