[KLUG Members] What is crosss linked SAN ?

[Adam Tauno Williams]

> What is crosss linked SAN ?

It is a hashing of a couple of terms.  With a SAN you can allocated
blocks of storage as devices and designate them for use by different
hosts (like a big storage pool).  But traditionally  a chunk of storage
is used by one host, as if it was locally attached.  You can't use the
same storage pool from multiple hosts  (like mounting /dev/hda1 on two
machines at the same time - that way lies scary carnival death).  But
with things like GFS you can safely (in theory, anyway) connect multiple
machines to a single storage pool,  essentially making a filesystem that
is 'crosslinked', that is mounted multiple times.  The servers can share
the data without IP overhead across something like a gigabit ethernet or
fiber channel connection.  This is much faster than using something like
a NAS (of course it is also much more expensive).
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