[PVE-User] Using Sheepdog on the data directory

[Alexandre DERUMIER]

----- Mail original ----- 

De: "Andrew Niemantsverdriet" <andrew at rocky.edu> 
À: "Fábio Rabelo" <fabio at fabiorabelo.wiki.br> 
Cc: pve-user at pve.proxmox.com 
Envoyé: Mardi 16 Octobre 2012 17:48:01 
Objet: Re: [PVE-User] Using Sheepdog on the data directory 

Hi, 


>>I guess my main question is why the change away from the upstream? 
>>That just increases the work load for the developers and I am not 
>>seeing a clear benefit to it. 

what changes ?
the only thing different is the /etc/init.d/sheepdog, using pid files to restart daemons,and

to handle multiple sheep daemons and  with differents disk (/discX).

So you don't need local node raid hardware for theses disk,you can assign 1 disk by sheep daemon.
So you avoid to double data protection, raid local+ replication on sheep cluster


>>But of course you can assign a local raid in /discX.   
>> Right I understand in principle it works, my question is how do I make the 
>> data directory (/varr/lib/vz) be used by sheepdog. The issue is that the 
>> pve-sheepdog package deviates from how the upstream package works by 
>> introducing the concept of disk{0-9}. So my question remains, how do I use 
>> the data directory with sheepdog? 

you can edit the /etc/init.d/sheepdog, /var/lib/sheepdog/ is hardcorded.
I'll try to add a variable to change this in the coming days.

you can also try to do a symlink, but i'm not sure it'll work.



_ 
/-\ ndrew 

On Fri, Oct 12, 2012 at 1:23 PM, Fábio Rabelo <fabio at fabiorabelo.wiki.br> wrote: 
> 2012/10/12 Andrew Niemantsverdriet <andrew at rocky.edu> 
>> 
>> Hi, 
>> 
>> 
>> On Fri, Oct 12, 2012 at 12:52 PM, Fábio Rabelo <fabio at fabiorabelo.wiki.br> 
>> wrote: 
>>> 
>>> 2012/10/12 Andrew Niemantsverdriet <andrew at rocky.edu> 
>>>> 
>>>> I am wanting to do some tests with sheepdog and proxmox. 
>>>> 
>>>> The wiki mentions mounting a dedicated disk for this purpose, however I 
>>>> would like the entire data directory to reside on sheepdog. Is this possible 
>>>> with the pve-sheepdog package? It seems to deviate some from what is being 
>>>> shipped upstream to accommodate the mounting of dedicated disks. If it is 
>>>> possible what steps do I need to take to make that happen. 
>>>> 
>>> Hellows to all 
>>> 
>>> I am doing my tests for some days ... 
>>> 
>>> The wiki omits some things, I've trying to register and edit it ... 
>>> 
>>> Anything you mount on /var/lib/sheepdog/discx will be recognized and 
>>> showed in web gui after the setup is finished . 
>>> 
>>> You can have multiple devices, one as disc0, another as disc1 and so on . 
>>> 
>>> It can be a single disk or a RAID 0/1/10/50 or whatever you want . 
>>> 
>>> And MUST have the extended attribute option in /etc/fstab set . 
>>> 
>>> You have to create the file "startup" in every device you mount, and 
>>> start the daemon after the creation of this file . 
>>> 
>>> After that, start the daemon, format the cluster, add the appropriate 
>>> content to file /etc/pve/storage.cfg like the example in the wiki, and you 
>>> will be ready to go ! 
>>> 
>>> The performance are completely dependant on what you mount . 
>>> 
>>> I do not know much about stability, my tests has just began, but it works 
>>> great ! 
>>> 
>>> 
>>> Fábio Rabelo 
>> 
>> 
>> Right I understand in principle it works, my question is how do I make the 
>> data directory (/varr/lib/vz) be used by sheepdog. The issue is that the 
>> pve-sheepdog package deviates from how the upstream package works by 
>> introducing the concept of disk{0-9}. So my question remains, how do I use 
>> the data directory with sheepdog? 
>> 
> 
> I'm not shure if I understand what you asking but .... 
> 
> If you do not mount anything in /var/lib/sheepdog, just create a folder 
> called disc0 ( mkdir /var/lib/sheepdog/disc0 ) in all your nodes, then 
> create the startup file ( touch /var/lib/sheepdog/disc0/startup ) in all 
> your nodes, and then start sheepdog daemon, you will use your filesystem as 
> storage for sheepdog ! 
> 
> This was my very first test . 
> 
> But the performance are poor, to many i/o traffic in a single disk ... 
> 
> The only deviation on upstream sheepdog are the disc0 disc1 thing, vanila 
> sheepdog stores directly in /var/lib/sheepdog . 
> 
> If it is not what you are asking, then please ask again .... 
> 
> 
> Fábio Rabelo 



-- 
_ 
/-\ ndrew Niemantsverdriet 
Linux System Administrator 
Academic Computing 
(406) 238-7360 
Rocky Mountain College 
1511 Poly Dr. 
Billings MT, 59102 
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