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

[Bart Van Assche]

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.