> 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 <firstname.lastname@example.org>
-- 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to email@example.com More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/