Messages in this thread | | | Date | Mon, 17 Feb 2003 10:52:15 +0100 | From | Lars Marowsky-Bree <> | Subject | Re: Accessing the same disk via multiple channels |
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On 2003-02-14T15:37:47, Patrick Mansfield <patmans@us.ibm.com> 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.
Sincerely, Lars Marowsky-Brée <lmb@suse.de>
-- Principal Squirrel SuSE Labs - Research & Development, SuSE Linux AG
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