Server nodes can be added to an existing file system, but not without
bringing down the file system. An overview of the normal process looks
like this:
- unmount pvfs on clients
- stop old servers
- modify configuration file to add new servers (using unused handle ranges)
- create storage space on new servers (-f option to pvfs2-server)
- start both new and old servers
- mount pvfs on clients
You don't necessarily have to change the pvfstab file entry. The
clients can still continue to use any server to retrieve mount
information for the file system.
One caveat is that there is no automatic rebalancing of old data on the
file system if that is a concern. Any old files will continue to be
striped across just the old set of servers, while newly created files
will be striped across both the old and new servers.
-Phil
Mike Young wrote:
Hi,
Can nodes be added or subtracted from a cluster w/o bringing down the
file system? I understand the pvfstab entry needs to be updated on all
of the nodes, but I'm wondering how to dynamically scale a pvfs2 cluster.
Thanks,
Mike
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