malahal@xxxxxxxxxx wrote:
John Hughes [john@xxxxxxxxx] wrote:
I want to turn queue_if_no_path off and use
polling_interval 5
no_path_retry 5
because I've had problems with things hanging when a lun "vanishes" (I
deleted it from my external raid box).
But whatever I put in /etc/multipath.conf when I do a "multipath -l" or
"multipath-ll" it shows:
Did you reload the mapper table?
360024e80005b3add000001b64ab05c87dm-28 DELL ,MD3000
[size=68G][features=1 queue_if_no_path][hwhandler=1 rdac]
\_ round-robin 0 [prio=3][active]
\_ 3:0:1:13 sdad 65:208 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 4:0:0:13 sdas 66:192 [active][ghost]
Which is entirely correct. The 'queue_if_no_path' flag _has_ to
be set here as we do want to retry failed paths, if only for
a limited amount of retries.
The in-kernel dm-multipath module should handle the situation correctly
and switch off the queue_if_no_path flag (= pass I/O errors upwards)
when the amount of retries is exhausted.
You can only switch the flag off by setting 'no_path_retry failed'.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@xxxxxxx +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)
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