[dm-devel] [PATCH 01/12] multipath: add "ghost_delay" parameter

[Martin Wilck]

On Thu, 2017-12-07 at 12:48 -0600, Benjamin Marzinski wrote:
> If the lower-priority passive paths for a multipath device appear
> first,
> IO can go to them and cause the hardware handler to activate them,
> before the higher priority paths appear, causing the devices to
> failback. Setting the "ghost_delay" parameter to a value greater than
> 0 can avoid this ping-ponging by causing udev to not mark the device
> as
> Ready after its initial creation until either an active path appears,
> or ghost_delay seconds have passed. Multipathd does this by setting
> the MPATH_UDEV_NO_PATHS_FLAG.
> 
> Signed-off-by: Benjamin Marzinski <bmarzins at redhat.com>
Reviewed-by: Martin Wilck <mwilck at suse.com>

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