Hi Serkan,
thank you very much for your answer. I really appreciate your suggestion (extension + rebalance + upgrade), but we would like to avoid any errors or risks of data loss during the upgrade procedure (we don’t have an advanced experience and we don’t know what to do if something goes wrong). Currently, our Gluster volume contains a lot of consolidated and important scientific data and, unfortunately, we didn’t yet activate the Gluster support.
Thank you for sharing with me your opinion. Regards, Mauro
in order to copy the data from the old volume to the new one, I need a third machine that can mount both the volumes; it's possible? if yes, which gluster client version should I use/install on the "bridge" machine?
Yes it is possible, you need to install old client version to bridge server, old clients can talk to new servers Why not just extend the old cluster & rebalance and then upgrade to latest version of glusterfs? On Thu, Jun 7, 2018 at 3:18 PM, Mauro Tridici < mauro.tridici@xxxxxxx> wrote: Dear Users,
just one year ago, we implemented a tier2 storage based on GlusterFS
v.3.10.5 and we can say that it works like a charm.
The GlusterFS volume has been created using 3 physical servers (each server
contains 12 disks, 1 brick per disk).
Below, you can find some information about the gluster volume type
Volume Name: tier2
Type: Distributed-Disperse
Volume ID: a28d88c5-3295-4e35-98d4-210b3af9358c
Status: Started
Snapshot Count: 0
Number of Bricks: 6 x (4 + 2) = 36
Transport-type: tcp
Now, it's time to expand this volume so we bought 3 new servers similar to
the 3 existing servers. Since we would like to upgrade the Gluster version
to last available one, we would like to know if the following action plan is
correct and safe:
1) creation of a new gluster distributed disperse volume (6x(4+2)) using the
3 new servers and the new gluster version;
2) copy of all the data saved on the old gluster volume to the new one;
3) complete erasure of three old servers operating system;
4) installation of the last available version of the operating system and
glusterfs software stack on the three old servers;
5) expansion of the volume (created at point nr.1) adding the new bricks
(created at point nr.4)
If our action plan can be considered "validated", I have an other question:
- in order to copy the data from the old volume to the new one, I need a
third machine that can mount both the volumes; it's possible? if yes, which
gluster client version should I use/install on the "bridge" machine?
Thank you very much for your attention.
Regards,
Mauro
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Mauro Tridici
Fondazione CMCC CMCC Supercomputing Center presso Complesso Ecotekne - Università del Salento - Strada Prov.le Lecce - Monteroni sn 73100 Lecce IT
mobile: (+39) 327 5630841
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