[pve-devel] DRBD9 test packages for jessie

[Cesar Peschiera]

It is fantastic !!!

Talking about of DRBD, for now, and if is possibe, i would like to order a 
features:

1- While a VM is running with LVM on top of DRBD, the replicate storages be 
in secondary mode, ie, only to have a primary storage for each VM that is 
running (that always was the recommendation of LINBIT for security reasons).

2- And when i apply a live migration of a VM, the DRBD plugin first see if 
the replicated storage is perfectly synchronized (in terms of drbd "oos" 
that mean: "out of sync"), and if really are perfectly synchronized, the 
plugin converts the secondary storage in primary for after apply the live 
migration, and after of a live migration successfully, finally convert the 
old primary storage in secondary. Of this mode, always we have a primary 
storage in execution for each VM.

3- But if we have the case of "oos", the plugin don't accept the live 
migration, and a error message appear in the screen.

About of the verification of replicated storages in DRBD:
4- As DRBD has a command that do a verification of data and metadata of the 
replicated storages, will be fantastic have it  in the schedule of the 
PVE-GUI.

About of do a resynchronization if a storage is in "oos":
5- As DRBD has a set of commands for do a resynchronization (applied only to 
the blocks of disk that are different and not for the complet storage), also 
will be good have it in the PVE-GUI.


----- Original Message ----- 
From: "Dietmar Maurer" <dietmar at proxmox.com>
To: "Cesar Peschiera" <brain at click.com.py>; "PVE Development List" 
<pve-devel at pve.proxmox.com>
Sent: Friday, March 20, 2015 2:00 PM
Subject: Re: [pve-devel] DRBD9 test packages for jessie


>I just want to note that the new DRBD9 has some cool feature
>
> - support more that 2 nodes
> - support snapshots
> - as fast as DRBD 8.X
>
> I am now writing a storage plugin, so that we can do further tests...
>
>> Oh, OK, sorry
>>
>> >> DRBD9 isn't ready for his use in a production environment, now is in
>> >> pre-release phase...
>> >> http://www.linbit.com/en/component/phocadownload/category/5-drbd
>> >>
>> >> Respectfully I mean that I believe that will be good wait to that 
>> >> DRBD9
>> >> be
>> >> in a stable version before of release it in the pve repositories.
>> >
>> > That is why I compiled it for jessie, and uploaded to the jessie test
>> > repository.
>> >
>>
>>
>