[ClusterLabs] Antw: Re: Antw: Re: ocf:lvm2:VolumeGroup Probe Issue

[Eric Ren]

Hi,


On 02/16/2017 08:16 PM, Ulrich Windl wrote:

[snip]
>>>>> Any other advice? Is ocf:heartbeat:LVM or ocf:lvm2:VolumeGroup the
>>>>> more popular RA for managing LVM VG's? Any comments from other users
>>>>> on experiences using either (good, bad)?
>>>> I had a little bit experience on "ocf:heartbeat:LVM". Each volume group
>>>> needs an
>>>> independent resource agent of it. Something like:
>>> You mean "an independent resource instance (primitive)"?
>> Yes, I meant it for "ocf:heartbeat:LVM". And, I cannot find
>> "OCF:lvm2:VolumeGroup" on
>> SLES.
>>> One RA should be good for all VGs ;-)
>> Oh, really? if so, why "params volgrpname" is required?
> You are still mixing class (RA) and object (primitive)! IMHO RA is the script (class) like ocf:heartbeat:LVM, while the primitive (object) is a configuration based on the RA. So you'd have multiple objects (primitives) of one class (RA).

Aha, my bad. It's like the concepts of "class and object" in 
object-oriented language.
Thanks for pointing it out:)

Eric
>
> Regards,
> Ulrich
>
>> """
>> crm(live)configure# ra info ocf:heartbeat:LVM
>> ...
>> Parameters (*: required, []: default):
>>
>> volgrpname* (string): Volume group name
>>       The name of volume group.
>> """
>>
>> And I failed to show "OCF:lvm2:VolumeGroup":
>> """
>> crm(live)configure# ra info ocf:lvm2:
>> ocf:lvm2:clvmd     ocf:lvm2:cmirrord
>> """
>>
>> Am I missing something?
>>
>> Thanks for your input:)
>> Eric
>>>> """
>>>> primitive vg1 LVM \
>>>>            params volgrpname=vg1 exclusive=true \
>>>>            op start timeout=100 interval=0 \
>>>>            op stop timeout=40 interval=0 \
>>>>            op monitor interval=60 timeout=240
>>>> """
>>>>
>>>> And, "dlm" and "clvm" resource agents are grouped and then cloned like:
>>>> """
>>>> group base-group dlm clvm
>>>> clone base-clone base-group \
>>>>            meta target-role=Started interleave=true
>>>> """
>>>>
>>>> Then, put an "order" constraint like:
>>>> """
>>>> order base_first_vg1 inf: base-clone vg1
>>>> """
>>>>
>>>> Does "ocf:lvm2:VolumeGroup" can follow the same pattern?
>>>>
>>>> Thanks,
>>>> Eric
>>>>> Both appear to achieve the
>>>>> same function, just a bit differently.
>>>>>
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Marc
>>>>>
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