[Gluster-devel] Fwd: Gerry Reno .vol files and scripts

[Krishna Srinivas]

Hi All,

Maybe this piece of information will benifit others too, in case you
are confused about using -n option during glusterfs mount.

---------- Forwarded message ----------
From: Krishna Srinivas <krishna at zresearch.com>
Date: Jul 3, 2007 9:30 PM
Subject: Re: Gerry Reno .vol files and scripts
To: Gerry Reno <greno at verizon.net>

Gerry you are not getting it ....

See, -n option should not be used in normal cases, its used normally
during debugging, say when you want to override the topmost translator.

If you really want to use -n option, just give -n afr which is the name of
the afr volume in your spec. which is same as not using -n option.

Internally, when glusterfs process is started, it arranges the
xaltors like this:

                   ------>client0
fuse --->afr ---->client1
                   ----->client2
                   ------>client3

i.e fuse talks to afr, and afr talks to client0, client1, client2, client3

However if you give "-n client0", the arrangement will be like this:

fuse--------------->client0
               afr ---->client1
                   ----->client2
                   ------>client3

So fuse will directly talk to client0, so afr does not even come into
picture, so no files are replicated.

I dont know if the diagrams will reach you in a proper formatted way.

Come to IRC if it does not make sense.

Krishna




On 7/3/07, Gerry Reno < greno at verizon.net> wrote:
> >> > Krishna Srinivas wrote:
> >> >>>>>>>> Yes '-L DEBUG' is declared.
> >> >>>>>>>> glusterfs -l /var/log/glusterfs.log -L DEBUG --spec-file
> >> >>>>>>>> /usr/local/etc/glusterfs/test-client.vol -n client0
> >> >>>>>>>> /mnt/glusterfs0/
> >> >>>>>>>>
> >> >>>>>>>>
> >> >>>>>>>>
> >> >>>>> you should not give -n client0 here, it will override the afr
> >> >>>>> translator.
> >> >>>>> Hence you are not seeing any replication!
> >> >>>>>
> >> >>>>>