[ceph-users] Best version and SO for CefhFS

Daniel Carrasco d.carrasco at i2tic.com
Wed Oct 10 00:49:27 PDT 2018


Hello,

I'm trying to create a simple cluster to archieve HA on a webpage:

   - Three nodes with MDS, OSD, MON, y MGR
   - Replication factor of three (one copy on every node)
   - Two active and a backup MDS to allow a fail of one server
   - CephFS mounted using kernel driver
   - One disk by node of less than 500GB

I've already tested other solutions like EFS, GlusterFS, NFS Master-Slave,
and all are slower than CephFS or don't have HA (NFS).
For now I've got a lot of troubles with FS (all MDS related), like high
memory consumption caused by memory leaks (12.2.4), slow MDS requests after
update and after a few hours (12.2.8, resolved restarting the MDS)... and
for now I had to remove the entire cluster and mount a DRBD cluster (wich
is not as good as Ceph and don't have HA).

With all this problems my questions are:

   - Wich is the best free OS to create an small cluster?. For now i've
   used only debian based (Debian 9 and Ubuntu 16.04).
   - Wich is the vest Ceph version?. Maybe the 10.2.10 is more stable?
   - Wich is the best configuration to avoid that MDS problems.

Our servers have 8GB of RAM, but is shared with other daemons that uses
about 4GB.

Thanks!

-- 
_________________________________________

      Daniel Carrasco Marín
      Ingeniería para la Innovación i2TIC, S.L.
      Tlf:  +34 911 12 32 84 Ext: 223
      www.i2tic.com
_________________________________________
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