Mark Crispin wrote:
On Tue, 23 Nov 2004, Yiorgos Adamopoulos wrote:
Does anybody have any experiense on such a configuration? iSCSI
partitions look like local disks to the OS (or at least this is my
understandig) but in truth they reside on another server on the network.
I doubt very much that mbx format will work on any network filesystem,
even if the locking problem is solved. The only network filesystem that
I know of in which mbx would work was the old TOPS-20 from two decades
ago, and only because that filesystem had rigorous token passing on a
page to guarantee that updates were atomic across all users of the
network filesystem.
It's my understanding that iSCSI does not implement a network filesystem
but simply (?) a way to transport a SCSI bus over an IP infrastructure.
iSCSI servers can be configured to support multiple seperate iSCSI
targets (logical disks) for multiple seperate iSCSI clients (servers).
Each server having it's own logical disk. In this instance there is no
shared file system. However all file systems are stored on a single
storage server which can then have a central backup system.
Chances are an iSCSI server can be configured to enable to clients to
access the same filesystem. At this point if the two clients cannot
co-ordinate access then IMAP won't be able to either.
Guy
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Guy Dawson I.T. Manager Crossflight Ltd
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