On 01/13/2015 01:01 AM, Sebastian Herbszt wrote:
Hello Christophe,
Christophe Varoqui wrote:
Hi,
the precedence chain is :
multipaths > user-specified per-device > default per-device > default
The issue adressed by Ben's patch would not be solved by your suggestion,
as far as I can see. The proposed override section is just a way not repeat
a per-device in each multipath (insane) or device (tedious) section.
care to explain why setting the precedence to
multipaths > user-specified per-device > default > default per-device
would not fix the issue?
It may very well "fix" the issue but having global default overriding
drive-specific default seems to me as wrong as breaking compatibility by
such change which would likely introduce more issues.
-- Martian
Lets assume the following default device and user configuration:
.vendor = "COMPELNT",
.product = "Compellent Vol",
.pgpolicy = MULTIBUS,
.pgfailback = -FAILBACK_IMMEDIATE
.no_path_retry = NO_PATH_RETRY_QUEUE,
.checker_name = TUR
defaults {
no_path_retry fail
}
devices {
device {
vendor "COMPELNT"
product "Compellent Vol"
path_grouping_policy "group_by_prio"
}
}
multipaths {
multipath {
wwid 1234
failback 15
}
}
The default section should change no_path_retry from "queue" to "fail".
The device section should change path_grouping_policy from "multibus"
to "group_by_prio" for "COMPELNT/Compellent Vol".
The multipath section should change failback from "immediate" to 15
for wwid 1234.
The path_checker would still be "tur".
Is this not what the "overrides" patch intended?
Sebastian
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