Re: [LSF/MM TOPIC] linux servers as a storage server - what's missing?

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On Wed, Jan 18, 2012 at 6:46 PM, Roland Dreier <roland@xxxxxxxxxxxxxxx> wrote:
> > Why would you crash is you have device mapper multipath configured to handle
> > path fail over? We have tons of enterprise customers that use that...
>
> cf http://www.spinics.net/lists/linux-scsi/msg56254.html
>
> Basically hot unplug of an sdX can oops on any recent kernel, no
> matter what dm stuff you have on top.
>
> > On the broader topic of error handling and so on, I do agree that is always
> > an area of concern (how many times to retry, how long time outs need to be,
> > when to panic/reboot or propagate up an error code)
>
> Yes, especially the scsi eh stuff escalating to a host reset when
> a single drive has gone bad -- even if the HBA is happily doing IO
> to other drives, we'll kill access to the whole SAS fabric.

With which SCSI low-level diver does that occur and how does the call
stack look like ? I haven't encountered any such issues while testing
the srp-ha patch set. However, I have to admit that the issues
mentioned in the description of commit 3308511 were discovered while
testing the srp-ha patch set.

Bart.
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