[dm-devel] [PATCH] libmultipath: update 3PARdata builtin config
Xose Vazquez Perez
xose.vazquez at gmail.com
Mon Jul 31 11:37:42 UTC 2017
On 07/29/2017 12:37 AM, Benjamin Marzinski wrote:
> Here I what I got from HP:
>
> 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
Fine, I will send a v2 PATCH with that text. Christophe, drop this one.
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