Paul Gilmartin wrote:
Hmmm. It seems you want the volume accessed as a block special device,
but not mounted as a filesystem.
Exactly.
I want to test OCFS2 with two virtual machines. I guess I should have
said that from the beginning.
I'm using VirtualBox 3.0.7 r52399 (the semi-official quick fix released
after the 64 bit issues with 3.0.6) on Windows XP x86. The guest is
Oracle Enterprise Linux 5.3 x86_64 (like Red Hat 5.3, with OCFS2 on top
and a few other things).
How is this planned to work in the real world? Multiple SCSI/USB/1394
ports connected to the various hosts; host software arbitrating
integrity, connected by ... TCP/IP? Control path via disk controller?
For real-world applications, it's a cluster of servers connecting to the
same SAN over fiber. Many servers can share the same LUN ("block
device"), which is then formatted and mounted r/w on all servers. The
distributed FS takes care of the concurrent access issues.
Sometimes, a distributed storage like DRBD is used instead (it's like a
mirror RAID over the network), with OCFS2 or GFS on top. Performance is
less, but it's cheaper.
--
Florin Andrei
http://florin.myip.org/
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