Thanks for the summary.
Happy to see you were busy during my vacation :)
On ven, 2005-09-16 at 09:17 +0200, Nicola Murino wrote:
> my mutipath-tools configuration file is the following:
>
> grep -v "#" /etc/multipath.conf
> defaults {
> multipath_tool "/sbin/multipath -v0"
This keyword is obsolete, leave it out.
I'll make that explicit in the templates upstream.
> udev_dir /dev
> polling_interval 5
> default_selector "round-robin 0"
> default_getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
> default_prio_callout "/bin/true"
Try to comment out that line, as you don't use a prioritizer anyway.
Your PG switching spam may come from that ... please report about that.
> failback immediate
> }
> multipaths {
>
> multipath {
> wwid 3600601608c901200ccfe543f4053d911
> alias 200Gb
'b' is commonly used for bits, 'B' for bytes.
Anyway, I guess you search for problems naming your LU after their
size ... sizes change, and are not garanteed to stay unique.
> path_grouping_policy failover
> path_checker readsector0
define as a default ?
> path_selector "round-robin 0"
> failback immediate
redundant with the defaults ... harmless but confusing.
> }
> }
>
> multipathd start at boot time
>
> rc-update add multipathd default
> some tests:
>
> 1) one path failure
>
> /var/log/messages
>
> Sep 14 19:33:21 nodob multipathd: 8:96: emc_clariion_checker: query command indicates error
> Sep 14 19:33:21 nodob multipathd: checker failed path 8:96 in map 300Gb
> Sep 14 19:33:21 nodob multipathd: 8:112: emc_clariion_checker: query command indicates error
> Sep 14 19:33:21 nodob multipathd: checker failed path 8:112 in map 200Gb
> Sep 14 19:33:21 nodob multipathd: 8:128: emc_clariion_checker: query command indicates error
> Sep 14 19:33:21 nodob multipathd: checker failed path 8:128 in map 3600601608c901200a8b8972f4053d911
> Sep 14 19:33:21 nodob multipathd: 8:144: emc_clariion_checker: query command indicates error
> Sep 14 19:33:21 nodob multipathd: checker failed path 8:144 in map 3600601608c901200bc7680294053d911
> Sep 14 19:33:21 nodob multipathd: 8:160: emc_clariion_checker: query command indicates error
> Sep 14 19:33:21 nodob multipathd: checker failed path 8:160 in map 5Gb
> Sep 14 19:33:21 nodob multipathd: remove sdg path checker
> Sep 14 19:33:21 nodob multipathd: remove sdh path checker
> Sep 14 19:33:21 nodob multipathd: remove sdi path checker
> Sep 14 19:33:21 nodob multipathd: remove sdj path checker
> Sep 14 19:33:21 nodob multipathd: remove sdk path checker
> Sep 14 19:33:22 nodob multipathd: 8:160: mark as failed
> Sep 14 19:33:43 nodob multipathd: 300Gb: switch to path group #1
> Sep 14 19:33:43 nodob multipathd: 3600601608c901200a8b8972f4053d911: switch to path group #1
> Sep 14 19:33:43 nodob multipathd: 3600601608c901200bc7680294053d911: switch to path group #1
> Sep 14 19:33:43 nodob multipathd: 5Gb: switch to path group #1
> Sep 14 19:33:43 nodob multipathd: 8:96: mark as failed
> Sep 14 19:33:43 nodob multipathd: 8:128: mark as failed
> Sep 14 19:33:43 nodob multipathd: 8:144: mark as failed
> Sep 14 19:33:43 nodob multipathd: 8:160: mark as failed
>
>
> I can write to the storage without problem
>
> 2) the failed path turn up
>
> I read and write without problem
>
> every few seconds I have the following messages in /var/log/messages
>
> Sep 14 19:36:58 nodob multipathd: 300Gb: switch to path group #1
> Sep 14 19:36:58 nodob multipathd: 200Gb: switch to path group #2
> Sep 14 19:36:58 nodob multipathd: 3600601608c901200a8b8972f4053d911: switch to path group #1
> Sep 14 19:36:58 nodob multipathd: 3600601608c901200bc7680294053d911: switch to path group #1
> Sep 14 19:36:58 nodob multipathd: 5Gb: switch to path group #1
>
>
> Cristophe is ok?
>
One time would be ok.
Looping switches are harmless, but strange anyway.
As suggested earlier, try commenting out the prioritizer configlet.
> 3) other path failure
>
> 4) reboot with one path failed:
>
> 5) the failed path return up
>
> 6) If I set multibus instead of failover in multipath.conf I have read-only filesystem after a path failure
>
> Conclusion
>
> For me multipath-tools on EMC CX300 works fine, there are only issue if i try multibus instead of failover, but I don't need multibus
>
> thanks for multipath-tools,
>
your welcome,
--
christophe varoqui <christophe.varoqui@xxxxxxx>
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