[Sheepdog] Use a dedicate nic for sync and other questions

[Valerio Pachera]

2011/9/3 MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp>:
> But if you run two sheeps daemon, the I/Os will be distributed over
> two disks.  If we can specify a nic for each daemon, I think there is
> no big difference between using RAID0 and running multiple sheeps.

You are right!
And it's also better to run 2 sheep daemon instead of use a raid0
because if one of the disks dies, I lose only the chunks on that disks
and not both like it would happen on raid0. So less time needed to
sync the lost chunks.

> I think it is a good idea to support specifying interfaces used for
> normal I/Os and object recovery.  For example:
> $ sheep /store_1 --nic io:eth0 --nic sync:eth1
> $ sheep /store_2 --nic io:eth2 --nic sync:eth3

I do not have clear what you mean with normal I/0.