[dm-devel] [PATCH v2] libmultipath: update 3PARdata builtin config

[Xose Vazquez Perez]

On 07/31/2017 01:38 PM, Xose Vazquez Perez wrote:
> From: Benjamin Marzinski <bmarzins at redhat.com>>
> This updated config comes from hp.
> 
> Here I what I got from HP:
> 

Patch missing in last merge.


> ********
> 
> We will be changing the recommendation in the next version of the 3PAR
> Implementation Guide. I am the owner for these guides.
> 
> The reason we want the  dev_loss_tmo "infinity"  is to help in a feature
> called Peer Persistence where on primary array power fails and the
> device on the remote array (standby array) becomes active. The standby
> state of the device paths will automatically change to active state if
> the underlying device instances exist so we need infinity setting.
> 
> The fast_io_fail_tmo we want to be bumped from 5 to 10 so that it allows
> a array feature called persistent port to work well where we want the
> want the array path going away failure transient state to be held for
> the longer time in the SCSI and FC OS layers (I/O retry) without
> multipath reacting to it which allows the array to move the physical
> port flogi instance on the switch to move to partner physical port as an
> NPIV Port when the array node goes down.  Complete details in this PDF
> 
> https://www.hpe.com/h20195/v2/GetPDF.aspx/4AA4-4545ENW.pdf
> 
> *******
> 
> Cc: Christophe Varoqui <christophe.varoqui at opensvc.com>
> Cc: device-mapper development <dm-devel at redhat.com>
> Signed-off-by: Benjamin Marzinski <bmarzins at redhat.com>
> Signed-off-by: Xose Vazquez Perez <xose.vazquez at gmail.com>
> ---
>  libmultipath/hwtable.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/libmultipath/hwtable.c b/libmultipath/hwtable.c
> index c2ed171..9e14ec1 100644
> --- a/libmultipath/hwtable.c
> +++ b/libmultipath/hwtable.c
> @@ -98,6 +98,8 @@ static struct hwentry default_hw[] = {
>  		.hwhandler     = "1 alua",
>  		.prio_name     = PRIO_ALUA,
>  		.no_path_retry = 18,
> +		.fast_io_fail  = 10,
> +		.dev_loss      = MAX_DEV_LOSS_TMO,
>  	},
>  	{
>  		/* RA8000 / ESA12000 */
>