[Gluster-users] Questions on adding brick to gluster

[Pat Haley]

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?

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

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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