On Thu, 1 May 2008, Brandon Lamb 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.
Sounds like you re-used the glusterfs backing directory on the second
machine that was used before. Remember, that directory has metadata
attched, too. When you changed the source directory's version to 3, the
other side may have had a higher version - and was empty, which meant that
it was synced to the other side.
This was discussed on the other thread where I asked for the exact same
thing. Your pointing it straight at live data was a tad too brave. In the
end I concluded that the approach was just too dangerous, so I just
mounted it as it should be and copied the files to the mount point the
slow way.
Gordan
