On 01/13/2016 11:25 PM, Hannes Reinecke wrote:
On 01/13/2016 06:52 PM, Benjamin Marzinski wrote:
On Wed, Jan 13, 2016 at 10:10:43AM +0100, Hannes Reinecke wrote:
c) implement block or scsi events whenever a remote port becomes
unavailable. This removes the need of the 'path_checker'
functionality in multipath-tools.
I'm not convinced that we will be able to find out when paths come back
online in all cases without some sort of actual polling. Again, I'd love
this to be simpler, but asking all the types of storage we plan to
support to notify us when they are up and down may not be realistic.
Currently we have three main transports: FC, iSCSI, and SAS.
Hello Hannes,
Since several years the Linux SRP initiator driver also has reliable and
efficient H.A. support. The IB spec supports port state change
notifications. But whether or not port state information affects the
path state should be configurable. Several IB users wouldn't like it if
port state information would affect the path state because the time
during which a port is down can be shorter than the time during which an
IB HCA keeps retrying to send a packet.
Bart.
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