There is a patch for 2.2 at
http://open-projects.linuxcare.com/t3/index.html
I think, it only partly solves this multipathing issue.
I would like to see multipathing as one major requirement for a
restructered SCSI stack in 2.5.
Mit freundlichen Gr��en / with kind regards
Martin Peschke
IBM Deutschland Entwicklung GmbH
GNU/Linux for S/390 and zSeries Development
Phone: +49-(0)7031-16-2349
Patrick Mansfield <[EMAIL PROTECTED]> on 26.06.2001 20:00:40
Please respond to Patrick Mansfield <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc: [EMAIL PROTECTED]
Subject: multi-path IO in SCSI mid-layer
Hi -
I'm interested in multi-path IO in the linux scsi mid-layer.
Are there developers working on changes to the scsi layers/interfaces?
I've seen references about such work, but no details.
Anyone else interested in or working on multi-path IO in the mid-layer?
I've looked at the code as to what changes might be required, and did
a simple prototype to issue IO requests using multiple paths for one device
-
configuring one device in with multiple paths using SCSI INQUIRY page 0x83,
and selecting a path (just round-robin) at scsi_submit_cmd() time.
But, a decent multi-path IO implementation requires significant changes
to the current linux scsi interfaces/structures - especially where no
functional interfaces exist, such as the direct references to Scsi_Device
host, and Scsi_Host host_queue.
--
Patrick Mansfield
[EMAIL PROTECTED]
[EMAIL PROTECTED]
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