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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