[linux-lvm] [PATCH] lib/metadata: add new api lv_is_available()

[Zdenek Kabelac]

Dne 01. 09. 20 v 0:37 David Teigland napsal(a):
> On Sun, Aug 30, 2020 at 11:49:38PM +0800, heming.zhao at suse.com wrote:
>> in my opinion, the 'not available'
> 
> We already use the word available/unavailable in other ways, so let's use
> "broken" for the moment, maybe we can find a better word.
> 
> 'lvs -o broken' would report 0|1.  Choosing an attr letter to represent
> that is not as important and can be decided on later.

I'd probably pick the 'opposite' word - i.e.  lvs -o lv_usable -

but ATM - I'm still no sure how the meaning would differ from  'partial'
(which seems like it"s still missing separate lvs attribute shown only through 
health attr column 9 letter).

But we probably need to look much deeper look at the meaning of partial -
which ATM is a simply transitivity enclosure over LV stack - while 
particularly in raid case we need to probably go deeper and device into
categories.

This would also greatly help the current activation logic as well - but we 
probably need to first acknowledge what is 'preferred' view from md raid side 
- as these do not have an exact match.

Zdenek