On 6/4/12 4:05 AM, Jacques du Rand wrote:
HI Guys
This all applies to Gluster3.3
I love gluster but I'm having some difficulties understanding some
things.
1.Replication(with existing data):
Two servers in simple single brick replication. ie 1 volume (testvol)
-server1:/data/ && server2:/data/
-server1 has a few millions files in the /data dir
-server2 has a no files in /data dir
So after i created the testvol and started the volume
QUESTION (1): Do i need to mount each volume on the servers like so
? If yes why ?
---> on server1: mount -t gluster 127.0.0.1:/testvol /mnt/gfstest
---> on server2: mount -t gluster 127.0.0.1:/testvol /mnt/gfstest
Only if you want to access the files within the volume on the two
servers which have the bricks on them.
CLIENT:
Then I mount the client:
mount server-1-ip:/testvol /mnt/gfstest
Question(2) :
I only see files from server2 ???
Probably hit and miss what you see, since your bricks are not consistent.
Question (3)
Whenever I'm writing/updating/working with the files on the SERVER i
should ALWAYS do it via the (local mount )/mnt/gfstest. I should never
work with files directly in the bricks /data ??
Correct - Gluster can't keep track of writes if you don't do it through
the glusterfs mount point.
Question (4.1)
-Whats the best-practise to sync existing "data" ?
You will need to force a manual self-heal and see if that copies all the
data over to the other brick.
find /mnt/gfstest -noleaf -print0 | xargs --null stat>/dev/null
Question (4.2)
-Is it safe to create a brick in a directory that already has files in
it ?
As long as you force a self-heal on it before you use it.
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