Hi Joe,
You have a couple options. You can just copy everything (using scp,
tar+ssh, etc.) in the storage directory (specified in the server.conf-
<hostname>) on the old server/raid over to one of the other nodes,
and run two servers on that node on different ports pointing at
different storage locations. Once the new raid is in place you can
copy the storage location back over.
To do this, you will have to modify the config files directly. Each
server has a server-specific config file (usually server.conf-
<hostname>). This file will have entries for the port and storage
location. You will need to modify both. You'll also need to modify
the fs.conf, so that the alias for the server you're migrating points
to the new location. I can give more details if this isn't clear
enough.
Also, Ti Leggett has written a rebalancing script for redistributing
storage after adding new servers, which isn't exactly what you're
trying to do, but you might be able to use it for your purposes. See:
http://www.beowulf-underground.org/pipermail/pvfs2-developers/2006-
August/002485.html
and especially:
http://www.beowulf-underground.org/pipermail/pvfs2-developers/2006-
September/002544.html
To redistribute onto fewer servers, you'll have to modify the fs.conf
to _not_ specify handle ranges (for either metadata or datafiles) on
the server you want to remove. Keep the server alias in place
though. This will force new files created in the copy over to only
be distributed on the other servers, but still allow the old files to
be accessed from the old server.
The disadvantage here is that you're just replacing one server with
another, so you don't benefit from the rebalance (freeing up space on
full servers). Unless you plan to add more than one raid/server to
replace the old one, the first option is probably your best choice.
There's also some research being done with online migration of files
in pvfs, but I'll let Julian comment on the details and status of
that work.
Thanks,
-sam
On Apr 6, 2007, at 7:53 AM, Joe Georger wrote:
Say I have a pvfs2 system using several raids as the underlying
storage. One of the raids is old and I want to replace it with a
larger
unit. Is there a utility that would copy all the data off that
raid to
the rest of the pvfs filesystem and then let me remove it? Or, how
would I go about accomplishing this task?
Thanks,
Joe
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