Re: [dm-devel] [Lsf] Notes from the four separate IO track sessions at LSF/MM

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On 04/29/2016 02:47 PM, Laurence Oberman wrote:
Recovery with 21 LUNS is 300s that have in-flights to abort.
[ ... ]
eh_deadline is set to 10 on the 2 qlogic ports, eh_timeout is set
> to 10 for all devices. In multipath fast_io_fail_tmo=5

I jam one of the target array ports and discard the commands
> effectively black-holing the commands and leave it that way until
> we recover and I watch the I/O. The recovery takes around 300s even
> with all the tuning and this effectively lands up in Oracle cluster
> evictions.

Hello Laurence,

This discussion started as a discussion about the time needed to fail over from one path to another. How long did it take in your test before I/O failed over from the jammed port to another port?

Thanks,

Bart.
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