Nicolas Williams wrote:
> On Fri, Oct 05, 2007 at 10:44:21AM -0700, John Plocher wrote:
>   
>> Lori Alt wrote:
>>     
>>> I'm not surprised that having /usr in a separate pool failed.
>>> The design of zfs boot largely assumes that root, /usr, and
>>> /var are all on the same pool, and it is unlikely that we would
>>> do the work to support any other configuration any time soon.
>>>       
>> This seems, uhm, undesirable.  I could understand if the initial
>> *implementation* chose to make these simplifying assumptions, but
>> if the *architecture* or *design* of the feature requires this,
>> then, IMO, this project needs a TCR to not be done that way.
>>
>> Certainly, many of us will be satisfied with all-in-one pool,
>> just as we are today with all all-in-one filesystem, so this
>> makes sense as a first step.  But, there needs to be the
>> presumption that the next steps towards multiple pool support
>> are possible without having to re-architect or re-design the
>> whole zfs boot system.
>>     
>
> I'm curious as to why you think this (note: I've nothing to do with ZFS
> development).  I understand the need for separate / and /usr in some
> cases, but how does separate / and /usr add value in a ZFS bootroot
> environment?  Is it because one might like to have a very tiny pool
> (e.g., on a USB flashdrive) to contain / and a larger one to contain
> /usr?
>   

Not a sufficient reason. Crypto policy is  a data set (file system/zvol) 
policy not
a storage pool policy.

The question of why to have different storage pools has still not been
satisfactorily addressed.  Methinks people are still confusing pools and
data sets.
 -- richard

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