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On 03/23/2016 06:56 PM, Ralf Simon
wrote:
Hello,
I've installed ....
# yum info glusterfs-server
Loaded plugins: fastestmirror
Loading mirror speeds from cached
hostfile
Installed Packages
Name : glusterfs-server
Arch : x86_64
Version : 3.7.6
I think the patch http://review.gluster.org/#/c/12748/ to enhance
the volinfo output went in for 3.7.7. But I would advise you to
use 3.7.9 that was recently released because a couple of arbiter
related fixes have happened since 3.7.6
Hope this helps,
Ravi
Release : 1.el7
Size : 4.3
M
Repo : installed
From repo : latest
Summary : Clustered
file-system
server
URL : http://www.gluster.org/docs/index.php/GlusterFS
License : GPLv2 or LGPLv3+
Description : GlusterFS is a
distributed
file-system capable of scaling to several
: petabytes. It aggregates various storage bricks over
Infiniband RDMA
: or TCP/IP interconnect into one large parallel network file
: system. GlusterFS is one of the most sophisticated file
systems in
: terms of features and extensibility. It borrows a powerful
concept
: called Translators from GNU Hurd kernel. Much of the code in
GlusterFS
: is in user space and easily manageable.
:
: This package provides the glusterfs server daemon.
I wanted to build a ...
# gluster volume create gv0
replica
3 arbiter 1 d90029:/data/brick0 d90031:/data/brick0
d90034:/data/brick0
volume create: gv0: success:
please
start the volume to access data
... but I got a ...
# gluster volume info
Volume Name: gv0
Type: Replicate
Volume ID:
329325fc-ceed-4dee-926f-038f44281678
Status: Created
Number of Bricks: 1
x 3 = 3
Transport-type: tcp
Bricks:
Brick1: d90029:/data/brick0
Brick2: d90031:/data/brick0
Brick3: d90034:/data/brick0
Options Reconfigured:
performance.readdir-ahead: on
... without the requested arbiter
!
The same situation with 6 bricks
...
# gluster volume create gv0
replica
3 arbiter 1 d90029:/data/brick0 d90031:/data/brick0
d90034:/data/brick0
d90029:/data/brick1 d90031:/data/brick1 d90034:/data/brick1
volume create: gv0: success:
please
start the volume to access data
[root@d90029 ~]# gluster vol info
Volume Name: gv0
Type: Distributed-Replicate
Volume ID:
2b8dbcc0-c4bb-41e3-a870-e164d8d10c49
Status: Created
Number of Bricks: 2
x 3 = 6
Transport-type: tcp
Bricks:
Brick1: d90029:/data/brick0
Brick2: d90031:/data/brick0
Brick3: d90034:/data/brick0
Brick4: d90029:/data/brick1
Brick5: d90031:/data/brick1
Brick6: d90034:/data/brick1
Options Reconfigured:
performance.readdir-ahead: on
In contrast the documentation
tells
....
Arbiter configuration
The arbiter configuration
a.k.a. the
arbiter volume is the perfect sweet spot between a 2-way
replica and 3-way
replica to avoid files getting into split-brain, without
the 3x storage
space as mentioned earlier. The syntax for
creating the volume
is:
gluster volume create
replica 3 arbiter
1 host1:brick1 host2:brick2 host3:brick3
For example:
gluster volume create
testvol replica
3 arbiter 1 127.0.0.2:/bricks/brick{1..6} force
volume create: testvol:
success: please
start the volume to access data
gluster volume info
Volume Name: testvol
Type: Distributed-Replicate
Volume ID: ae6c4162-38c2-4368-ae5d-6bad141a4119
Status: Created
Number of Bricks: 2
x (2 + 1) = 6
Transport-type: tcp
Bricks:
Brick1: 127.0.0.2:/bricks/brick1
Brick2: 127.0.0.2:/bricks/brick2
Brick3: 127.0.0.2:/bricks/brick3 (arbiter)
Brick4: 127.0.0.2:/bricks/brick4
Brick5: 127.0.0.2:/bricks/brick5
Brick6: 127.0.0.2:/bricks/brick6 (arbiter)
Options Reconfigured : transport.address-family: inet
performance.readdir-ahead: on `
What's going wrong ? Can
anybody help
?
Kind Regards
Ralf Simon
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