[Sheepdog] sheepdog question

[Dennis Jacobfeuerborn]

On 10/10/2011 06:07 AM, MORITA Kazutaka wrote:
> At Sun, 9 Oct 2011 00:53:48 +0200,
> Marin Marušić wrote:
>> Hi,
>>
>> I have a question, if I have uneven storage space available across various
>> servers in the cluster, will I still be able to use Sheepdog? Or must I have
>> the same storage configuration in each and every server? FE I have 3 servers
>> with 6x500GB disks in raid 10, and have 3 servers with only 2 500GB drives
>> RAID1. And I can't change that config for the time being :)
>
> Run multiple sheep daemons proportional to its capacity (3 daemons on
> servers with 6x500 GB and one daemon on the other), and Sheepdog would
> work as you expect, I think.  But the best way is to stop using RAID
> and run a sheep daemon on for each disk.

What happens if one of the disks dies? Can the daemon responsible for this 
disk deal with that and can I hot-plug a new disk an easily tell the daemon 
to treat it as such? This would make such a "one daemon per disk" setup 
superior to a raid-0 setup as only a smaller chunk of data would disappear 
when a disk dies.

Regards,
   Dennis