[ClusterLabs] Antw: LVM resource and DAS - would two resources off one DAS...

[roger zhou]

On 07/27/2017 09:20 PM, Ulrich Windl wrote:
> Hi!
> 
> I think it will work, because the cluster does not monitor the PVs or prtition or LUNs. It just checks whether you can activate the LVs (i.e.: the VG). That's what I know...
> 
> Regards,
> Ulrich
> 
>>>> lejeczek <peljasz at yahoo.co.uk> schrieb am 27.07.2017 um 15:05 in Nachricht
> <636398a2-e8ea-644b-046b-ff12358de875 at yahoo.co.uk>:
>> hi fellas
>>
>> I realise this might be quite specialized topic, as this
>> regards hardware DAS(sas2) and LVM and cluster itself but
>> I'm hoping with some luck an expert peeps over here and I'll
>> get some or all the answers then.
>>
>> question:
>> Can cluster manage two(or more) LVM resources which would be
>> on/in same single DAS storage and have these resources(eg.
>> one LVM runs on 1&2 the other LVM runs on 3&4) run on
>> different nodes(which naturally all connect to that single DAS)?

Yes, it works in production environment for users.

While, it could depend on your detailed scenarios. You should further 
evaluation if you need protect lvm vg metadata, eg. resize your lv on 
multiple node simultaneously. If so, to involve clvm or the coming 
lvmlockd is necessary.

--Roger

>>
>> Now, I guess this might be something many do already and
>> many will say: trivial. In which case a few firm "yes"
>> confirmations will mean - typical, just do it.
>> Or could it be something unusual and untested but
>> might/should work when done with care and special "preparation"?
>>
>> I understand that lots depends on what/how harwdare+kernel
>> do things, but if possible(?) I'd leave it out for now and
>> ask only the cluster itself - do you do it?
>>
>> many thanks.
>> L.
>>
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> 
> 
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