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SubjectRe: Accessing the same disk via multiple channels
On 2003-02-14T15:37:47,
Patrick Mansfield <> said:

> Generic multi-path without the lower levels knowing anything can waste a
> lot of resources. For example, for each extra path to a block device
> (disk) we end up with an extra sd plus associated data structures, and an
> extra scsi_device including multiple request queues.

I think these somehow still need to be exposed so that userspace can do
per-path diagnostics; unless you also want to move this into the kernel space,
which I'm not sure about.

What we really need is better error handling and escalation so that a higher
layer actually has a chance at really well done recovery and retrying.

Lars Marowsky-Brée <>

Principal Squirrel
SuSE Labs - Research & Development, SuSE Linux AG

"If anything can go wrong, it will." "Chance favors the prepared (mind)."
-- Capt. Edward A. Murphy -- Louis Pasteur
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