Bug 154439 - kernel dm-multipath: Path testing needs FAILFAST
kernel dm-multipath: Path testing needs FAILFAST
Status: ASSIGNED
Product: Fedora
Classification: Fedora
Component: device-mapper-multipath (Show other bugs)
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All Linux
medium Severity medium
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Assigned To: Mike Christie
: FutureFeature
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Reported: 2005-04-11 14:00 EDT by Alasdair Kergon
Modified: 2012-05-29 09:29 EDT (History)
8 users (show)

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Description Alasdair Kergon 2005-04-11 14:00:29 EDT
In the interest of reducing delay time when testing either good or
failed paths, could we prevent SCSI mid-layer initiated i/o
retry of these requests?  
                                                                               
                                                     
Currently the scsi_cmd_ioctl->sg_io->blk_execute_rq code
path for a multipath test i/o does not set the REQ_FAILFAST
bit in the flags field of the request structure.
                                                                               
                                                     
Possibly the desire for each of this attribute could be
passed as a flag bit setting in the flag field of the sg_io_hdr
structure passed into the kernel as part of the test path ioctl(2).

[Ed Goggin, EMC]
Comment 1 Lars Marowsky-Bree 2005-04-21 16:16:51 EDT
Is this not essentially a dup of #154436?
Comment 2 John Poelstra 2008-07-07 23:39:02 EDT
Question in comment #1
Comment 3 Alasdair Kergon 2008-09-27 03:10:11 EDT
John - work is progressing upstream in the scsi layer.

If we had a long-term category where we could park bugs while waiting for other development work, this one would have been in it.
Comment 4 Alasdair Kergon 2011-02-11 12:56:49 EST
Do you think this is still relevant?

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