[Gluster-devel] Re: Setting up a new AFR, but using one preexisting directory

[Brandon Lamb]

On Wed, Apr 30, 2008 at 11:21 PM, Brandon Lamb <brandonlamb at gmail.com> wrote:
>
> On Wed, Apr 30, 2008 at 10:35 PM, Brandon Lamb <brandonlamb at gmail.com> wrote:
> >
> > On Wed, Apr 30, 2008 at 2:09 PM, Brandon Lamb <brandonlamb at gmail.com> wrote:
> > >
> > > On Wed, Apr 30, 2008 at 2:04 PM, Brandon Lamb <brandonlamb at gmail.com> wrote:
> > > > I cant find the mail, I noticed it a few days ago, someone mentioned
> > > > something about setting the file attributes to 3? Does that make
> > > > sense?
> > > >
> > > > Anyway, it sounded like what may have been giving me some grief last
> > > > time I set up a 2 server afr config. On one server I had my web data,
> > > > and on the other i had a new blank folder. I thought by setting up
> > > > gluster (using the existing dir on one, and a new empty dir on the
> > > > other) that by doing the find () trick it would sync all the files,
> > > > but is this maybe not true?
> > > >
> > > > I bring this up for 2 reasons, one to have it answered, and two
> > > > because maybe this shoud be on the wiki somewhere.
> > > >
> > > > When setting up a new afr, should you start with 2 empty directories
> > > > and then copy your files to the glusterfs mount, or should you do an
> > > > rsync and then do the set attributes to 3 thing (could someone give a
> > > > little more detail or correct my language on this?).
> > > >
> > > > Hopefully I am making some sense with my question, Im not totally
> > > > clear on it myself.
> > > >
> > > > thanks!
> > >
> > > http://www.gluster.org/docs/index.php/Automatic_File_Replication_%28Mirror%29_across_Two_Storage_Servers
> > >
> > > Maybe this page could be worked up a little more with some information on this?
> > >
> > > I apologize for not knowing, Im not sure who all does the examples or
> > > if its one person or what. Could the person(s) in charge of the
> > > examples or maybe just this one add more to this though?
> > >
> > > It may seem redundant to those that are comfortable configuring the
> > > bricks, but myself, I dont fully understand what should go where, what
> > > order. I understand this is a hard question to answer though because
> > > of how configurable glusterfs can be.
> > >
> > > So my request I guess is specific to a 2 machine, server side afr with
> > > many clients config example(s).
> > >
> > > Maybe start with the basic one that is there, then add a few more
> > > examples with how you might tune it with performance translators and
> > > such. It would just save a little time compared to the trial and error
> > > method.
> > >
> >
> > Ok so using the setfattr -n trusted.glusterfs.version -v 3 <file/dir>
> > command, do you need to build a script to recurvisely go through every
> > file/folder for the given path?
> >
>
> Nevermind answered my own question
>
> find /mnt/raid/webcluster -depth -type f -execdir setfattr -n
> trusted.glusterfs.version -v 3 {} \; >/dev/null
>

Ok so some documentation on the implementations of doing this and what
order and such when starting a new cluster setup probably needs to be
put on the wiki too.

I just setup my two servers, one had a 30 gig web data dir and the
other an empty dir. I ran this command on the 30 gigs and then mounted
on a client machine and watched it happily delete my entire web data.
I am now at work after a mad rush here to launch our backup software
and restore from last night.

Oh the joys of sysadmining... sucks when it is your own damn fault. I
had to tell my boss, oh sorry, your message boards and orders for
today are lost. Oops!

So once I do a little more testing with this I will try to throw some
documentation together myself so other people dont find themselves in
this situation.

Thank goodness for backups!