[Moosefs-users] Is moosefs fault tolerant?

[Mario G. <mgi...@gm...>]

Hello,
I would like to understand better how moosefs works to see if it is
fault tolerant.

I have these questions to ask:

1) if mfsmaster burns what's really happen? Ok I have backups with two
metaloggers but are they synchronous updated? If I promote a
metalogger to master I get the filesystem back in the last state of
the master or I loose last files created and or updated?
2) looking at docs it seems that if I have a replica the replication
works it made directly by chunkservers. It seems to me it can cause a
split brain. For example: chunkserver A is updating B. B goes offline
so is not completely updated. Now A goes offline and B cames back
online. But B now has stale data!
3) I am playing with moosefs now. I have powered off a chunkserver and
then powered it on. Later a vmware virtual machine with a chunkserver
inside hanged (not powered off, but kernel oops). Now I cannot write
on several directories of my mfs mounted filesystem and cannot umount
it. What's happened?

Thanks,
Mario