In dm-multipath framework, using the hw-handler's error-function entry point, nothing can be known about the reason for IO failure. From this
function MP_FAIL_PATH/MP_BYPASS_PG/MP_ERROR_IO can returned.
If the same path needs to be tried (i.e. in pg_init) to figure out the
reason for failure there is no way to tell that to dm-multipath.
One way to do so, is to return MP_RETRY_PG_INIT from hw_handler's
error function. This would set current_pgpath and current_pg to NULL
which would trigger pg_init. The path won't fail until pg_init says so.
Should this option MP_RETRY_PG_INIT be added to dm-multipath?
Thanks & Regards,
JB
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