[Gluster-users] Questions on adding brick to gluster

[Nithya Balachandran]

Hi,


On 30 July 2018 at 00:45, Pat Haley <phaley at mit.edu> wrote:

>
> Hi All,
>
> We are adding a new brick (91TB) to our existing gluster volume (328 TB).
> The new brick is on a new physical server and we want to make sure that we
> are doing this correctly (the existing volume had 2 bricks on a single
> physical server).  Both are running glusterfs 3.7.11. The steps we've
> followed are
>
>    - Setup glusterfs and created brick on new server mseas-data3
>    - Peer probe commands in order to make sure that meas-data2 and
>    mseas-data3 are in a Trusted Storage Pool
>    - Added brick3 (lives on mseas-data3, is 91TB) to data-volume on
>    mseas-data2 (328TB)
>    - Ran *gluster volume rebalance data-volume fix-layout start *cmd
>    (fix-layout to NOT migrate data during process, we did not want to yet)
>    Still running as of this Email
>
> The first question we have is at what point should the additional 91 TB be
> visible to the client servers? Currently when we run "df -h" on any client
> we still only see the original 328 TB. Does the additional space only
> appear to the clients after the rebalance using fix-layout finishes?
>
> No, this should be available immediately. Do you see any error messages in
the client log files when running df? Does running the command from a fresh
mount succeed?


> The follow-up question is how long should the rebalance using fix-layout
> take?
>

This is dependent on the number of directories on the volume.

Regards,
Nithya

>
> Some additional information
>
> # gluster volume info
>
> Volume Name: data-volume
> Type: Distribute
> Volume ID: c162161e-2a2d-4dac-b015-f31fd89ceb18
> Status: Started
> Number of Bricks: 3
> Transport-type: tcp
> Bricks:
> Brick1: mseas-data2:/mnt/brick1
> Brick2: mseas-data2:/mnt/brick2
> Brick3: mseas-data3:/export/sda/brick3
> Options Reconfigured:
> diagnostics.client-log-level: ERROR
> network.inode-lru-limit: 50000
> performance.md-cache-timeout: 60
> performance.open-behind: off
> disperse.eager-lock: off
> auth.allow: *
> server.allow-insecure: on
> nfs.exports-auth-enable: on
> diagnostics.brick-sys-log-level: WARNING
> performance.readdir-ahead: on
> nfs.disable: on
> nfs.export-volumes: off
>
> Thanks
>
> --
>
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> Pat Haley                          Email:  phaley at mit.edu
> Center for Ocean Engineering       Phone:  (617) 253-6824
> Dept. of Mechanical Engineering    Fax:    (617) 253-8125
> MIT, Room 5-213                    http://web.mit.edu/phaley/www/
> 77 Massachusetts Avenue
> Cambridge, MA  02139-4301
>
>
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