Hi Cephers,
Our university could deploy ceph. The goal is to store datas for research
laboratories (non-HPC) . To do this, we plan to use Ceph with RBD (mount block
device) from a NFS ( or CIFS ) server (ceph client) to workstations in
laboratories. According to our tests, the OS (ubuntu or centos...) that map the
RBD block implements file system write cache (vm.dirty_ratio, etc ...). In that
case, the NFS server will always perform writes to workstations whereas it has
not finished writing datas to Ceph cluster - a nd regardless of whether the RBD
cache is enabled or not in the config [client] section.
My questions:
1. Does the activation of RBD cache is useful only when it combines
Virtuals Machnies (where QEMU can access an image as a virtual block device
directly via librbd) ?
2. Is it common to use Ceph, with RBD to share network file systems ?
3. And if so, what are the recommendations concerning the OS cache ?
Thanks a lot.
Stephane.
--
Université de Lorraine
Stéphane DUGRAVOT - Direction du numérique - Infrastructure
Jabber : stephane.dugra...@univ-lorraine.fr
Tél.: +33 3 83 68 20 98
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