[Gluster-users] Expand distributed replicated volume

[Lalatendu Mohanty]

On 05/05/2014 03:08 PM, Hugues Lepesant wrote:
> RE: [Gluster-users] Expand distributed replicated volume
>
> Hi all,
>
> Does someone have already meet this ?
>
> Best regards,
>
> Hugues
>

I tried the similar steps on two Fedora20 VMs (each with 3 100GB 
partition) + gluster 3.5.0, but did not hit this issue. Here are the 
steps I performed.

1. Created a distribute replicate volume (2x2).
2. mounted the volume using native glusterfs mount. "df -h" shows 200GB 
for the mount point.
3. performed add brick with 2 partitions. The volume info shows 3x2)
4.  df -h now shows 300GB for the mount point.

Thanks,
Lala
>
>     -----Message initial-----
>     *De:* Hugues Lepesant <hugues at lepesant.com>
>     *Envoyé:* mar. 29-04-2014 11:51
>     *Sujet:* [Gluster-users] Expand distributed replicated volume
>     *À:* gluster-users at gluster.org;
>
>     Hi all,
>
>     I want to create a distributed replicated volume.
>     And I want to be able to expand this volume.
>
>
>     To test this, I have 6 nodes each have a 10G disk to share.
>
>     First I create the initial volume.
>
>     # gluster volume create testvol replica 2 transport tcp
>     node-01:/export/sdb1/brick node-02:/export/sdb1/brick
>     node-03:/export/sdb1/brick node-04:/export/sdb1/brick
>
>     On the client, I mount the volume :
>
>     # mount -t glusterfs node-01:/testvol /storage-pool
>     # df -h /storage-pool/
>     Filesystem        Size  Used Avail Use% Mounted on
>     node-01:/testvol   20G  3.9G   17G  20% /storage-pool
>
>     The volume size is 20G, what I expect.
>
>     Now I want to expand this volume, adding brick.
>
>     To do so, I do on node-01:
>     # gluster volume add-brick testvol node-05:/export/sdb1/brick
>     node-06:/export/sdb1/brick
>     # gluster volume rebalance testvol start
>     # gluster volume rebalance testvol status
>     # gluster volume info testvol
>
>     Volume Name: testvol
>     Type: Distributed-Replicate
>     Volume ID: cd24ec0f-3503-4d67-9032-1db1d0987f9c
>     Status: Started
>     Number of Bricks: 3 x 2 = 6
>     Transport-type: tcp
>     Bricks:
>     Brick1: node-01:/export/sdb1/brick
>     Brick2: node-02:/export/sdb1/brick
>     Brick3: node-03:/export/sdb1/brick
>     Brick4: node-04:/export/sdb1/brick
>     Brick5: node-05:/export/sdb1/brick
>     Brick6: node-06:/export/sdb1/brick
>
>     The back on client :
>
>     # df -h /storage-pool/
>     Filesystem        Size  Used Avail Use% Mounted on
>     node-01:/testvol   20G  2.9G   18G  15% /storage-pool
>
>     Even If I umount/mount the volume, It's always 20G.
>     Should it not display a size of 30GB ?
>     Like if I create a distributed volume and the add-brick with
>     replicate option
>
>     # gluster volume create testvol transport tcp
>     node-01:/export/sdb1/brick node-02:/export/sdb1/brick
>     node-03:/export/sdb1/brick
>     # gluster volume start testvol
>     # gluster volume add-brick testvol replica 2
>     node-04:/export/sdb1/brick node-05:/export/sdb1/brick
>     node-06:/export/sdb1/brick
>     # gluster volume info testvol
>
>     Volume Name: testvol
>     Type: Distributed-Replicate
>     Volume ID: 31159749-85fb-4006-8240-25b74a7eb537
>     Status: Started
>     Number of Bricks: 3 x 2 = 6
>     Transport-type: tcp
>     Bricks:
>     Brick1: node-01:/export/sdb1/brick
>     Brick2: node-04:/export/sdb1/brick
>     Brick3: node-02:/export/sdb1/brick
>     Brick4: node-05:/export/sdb1/brick
>     Brick5: node-03:/export/sdb1/brick
>     Brick6: node-06:/export/sdb1/brick
>
>     On client :
>     # df -h /storage-pool/
>     Filesystem        Size  Used Avail Use% Mounted on
>     node-01:/testvol   30G   97M   30G   1% /storage-pool
>
>     I'm using glusterfs-server 3.5.0 on Ubuntu 14.04 Trusty.
>
>     Any help is welcome.
>     Best regards,
>     Hugues
>
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