[ClusterLabs] VG activation on Active/Passive

[Andrei Borzenkov]

Отправлено с iPhone

> 29 авг. 2015 г., в 21:51, Jorge Fábregas <jorge.fabregas at gmail.com> написал(а):
> 
>> On 08/29/2015 02:37 PM, Digimer wrote:
>> No need for clustered LVM, only the active node should see the PV. When
>> the passive takes over, after connecting to the PV, it should do a
>> pvscan -> vgscan -> lvscan before mounting the FS on the LV.
>> 
>> Keep you cluster simple; remove everything not needed.
> 
> Hi Digimer,
> 
> It would be great if my cluster could communicate with the storage-array
> to make it "present" or "unpresent" LUNs based on the cluster conditions
> but I'm afraid that's not possible :)  

Just use SCSI-3 persistent reservations to grant exclusive access to a node that has active resources.

> So yes, these are LUNs that are
> visible on both nodes.
> 
> I'm the one who asked you something regarding cLVM on IRC the other day
> (one of the many times you have helped me there) and I decided to go the
> cLVM/DLM route (because the LUNs are seen on both nodes)

I do not quite understand what it gains you. How having LVs on both nodes is different from having underlying raw devices?


> but now I have
> my issues with this VG activation.
> 
> Thanks.
> 
> Regards,
> Jorge
> 
> 
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