Hi,
OK, I was confused because in your original email you mentioned "a
multiple of the striped so 4 other node".
So yes your stripe count is 2, so you have to add bricks 2 by 2, as the
error message says. If you didn't, then it would mean that you would
distribute your data over two 2-brick stripes, and one 1-brick single
volume, which I am reasonably sure wouldn't work.
If you want to be able to add bricks one by one, you would need a
regular distributed volume, without:
- striping (requires adding as many drives as stripe count)
- replication (requires adding as many drives as stripe replication count)
- dispersion (requires adding as many drives as whatever your dispersion
disk count is)
The only two things that you can extend is the number of brick groups in
a distributed volume, with a similar brick group, or the number of
replicas (but I'm sure that there are corner cases where you can't do
it, I haven't tried them yet).
Is that clearer now?
Thanks!
JF
On 16/03/15 16:56, Pierre L?onard wrote:> Hi JF Le Fill?tre,
>
> Hello,
>
> You cannot. As the message said, you cannot change the stripe count.
>
> I don't change the strip count, the number is the same.
>
> So
> you can add 4 bricks and you have a distributed + striped volume, but
> you cannot change the stripe count by re-adding existing bricks into the
> volume with a different stripe count, or by adding an additional brick
> to the volume.
>
> That is the real question : "is it possible to add a node to a stripe
volume one by one ?"
> I not when I receive a new node I can't insert it in the global cluster
service !
>
>
> Your email isn't very clear; could you please send:
> - the list of commands in the order that you typed them;
> - the output of "gluster volume info" and "gluster volume
status"
>
> On one of the four node :
> [root at boogy2 ~]# gluster volume stop gvHome
>
> on the new node :
> [root at moody gvHome]# gluster volume add-brick gvHome
moody:/mnt/gvHome/brick1
> volume add-brick: failed: Incorrect number of bricks supplied 1 with count
2
>
> [root at boogy2 ~]# gluster volume info gvHome
>
> Volume Name: gvHome
> Type: Distributed-Stripe
> Volume ID: aa7bc5be-e6f6-43b0-bba2-b9d51ed2e4ef
> Status: Started
> Number of Bricks: 2 x 2 = 4
> Transport-type: tcp
> Bricks:
> Brick1: boogy1:/mnt/gvHome/brick1
> Brick2: boogy2:/mnt/gvHome/brick1
> Brick3: boogy3:/mnt/gvHome/brick1
> Brick4: boogy4:/mnt/gvHome/brick1
>
>
> [root at boogy2 ~]# gluster volume status gvHome
> Status of volume: gvHome
> Gluster process Port Online Pid
>
------------------------------------------------------------------------------
> Brick boogy1:/mnt/gvHome/brick1 49153 Y
21735
> Brick boogy2:/mnt/gvHome/brick1 49153 Y
121607
> Brick boogy3:/mnt/gvHome/brick1 49153 Y
26828
> Brick boogy4:/mnt/gvHome/brick1 49153 Y
116839
> NFS Server on localhost N/A N N/A
> NFS Server on moody N/A N N/A
> NFS Server on 138.102.172.94 2049 Y
116853
> NFS Server on boogy1 2049 Y
21749
> NFS Server on boogy3 2049 Y
26843
>
> Task Status of Volume gvHome
>
------------------------------------------------------------------------------
> There are no active volume tasks
>
>
>
> [root at boogy2 ~]# glusterd -V
> glusterfs 3.6.1 built on Nov 7 2014 15:15:48
>
>
> that's all.
>
>
> Many thank's
>
> sincereley
>
> --
> Signature electronique
> INRA <http://www.inra.fr>
>
> *Pierre L?onard*
> *Senior IT Manager*
> *MetaGenoPolis*
> Pierre.Leonard at jouy.inra.fr <mailto:Pierre.Leonard at
jouy.inra.fr>
> T?l. : +33 (0)1 34 65 29 78
>
> Centre de recherche INRA
> Domaine de Vilvert ? B?t. 325 R+1
> 78 352 Jouy-en-Josas CEDEX
> France
> www.mgps.eu <http://www.mgps.eu>
>
--
Jean-Fran?ois Le Fill?tre
-------------------------------
HPC Systems Administrator
LCSB - University of Luxembourg
-------------------------------
PGP KeyID 0x134657C6