linux multipath and EVA 5000

Jose Molina — Wed, 28 Feb 2007 05:04:11 GMT

Hello,

I've been trying to set up linux multipath to an EVA 5000. I've been reading most of the info on this, and i think i have it working, but i'm having one little problem that seems to have happened to other people, and i've been unable to solve it.
I have 2 disks, with 2 paths to an HSV110, active/pasive, so theres always one of the paths that has failed/faulty state (but enabled). The thing is, every poll interval (default 5 secs) I get these messages on the syslog:

[root@xxx ~]# multipath -l
3600508b400012e150001000000af0000
[size=1 GB][features="0"][hwhandler="0"]
\_ round-robin 0 [active]
\_ 1:0:0:1 sda 8:0 [active][ready]
\_ round-robin 0 [enabled]
\_ 1:0:1:1 sdc 8:32 [failed][faulty]

3600508b400012e150001000000b40000
[size=1 GB][features="0"][hwhandler="0"]
\_ round-robin 0 [enabled]
\_ 1:0:0:2 sdb 8:16 [failed][faulty]
\_ round-robin 0 [active]
\_ 1:0:1:2 sdd 8:48 [active][ready]

[root@xxx ~]# tail /var/log/messages
kernel: Device sdc not ready.
kernel: Device sdb not ready.
kernel: Device sdc not ready.
kernel: Device sdb not ready.
kernel: Device sdc not ready.
kernel: Device sdb not ready.

This is supposed to be happening because "multibus" was used in multipath.conf, but i've tried with "failover" and "group_by_prio" with the same results. Also "no_path_retry fail" didn't help. I've tried several configs on multipath.conf, and none got rid of this. Right now, i've put 5 minutes polling interval to "ease" the syslog spamming.

This is on RHEL AS4 U4, 2.6.9-42.ELsmp and Device-mapper 0.4.5 (0.4.7 needs newer kernel. If this solves the problem, I may try upgrading the kernel)

multipath.conf:
defaults {
multipath_tool "/sbin/multipath -v0"
udev_dir /dev
polling_interval 300
default_selector "round-robin 0"
default_path_grouping_policy failover
default_getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
default_prio_callout "/bin/true"
default_features "0"
rr_wmin_io 100
failback immediate
no_path_retry fail
}
[...]
device {
vendor "COMPAQ "
product "HSV110 (C)COMPAQ"
path_grouping_policy failover
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
path_checker tur
path_selector "round-robin 0"
hardware_handler "0"
#failback 15
rr_weight priorities
no_path_retry fail
}

Any help would be greatly appreciated, there must be someone out there using multipath active/pasive on HSV working!

Re: linux multipath and EVA 5000

Danny Petterson - DK — Wed, 28 Feb 2007 05:15:21 GMT

Maybe this is of some help?:

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1052911

Re: linux multipath and EVA 5000

Jose Molina — Wed, 28 Feb 2007 05:25:49 GMT

Thanks but i've already read that thread. Is the solution that active/pasive is not supported? I don't have an EVA 3000 and the link to the document doesn't work. On the other hand, Device-Mapper documentation has an example on how to configure HSV110 (mine), so i'm guessing it's supported...

Re: linux multipath and EVA 5000

Danny Petterson - DK — Wed, 28 Feb 2007 05:49:46 GMT

The documentation, for both 4.0A (http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00581860/c00581860.pdf)and 4.0B, states that active/active, or singlepath is supported. Not active/passive.

Re: linux multipath and EVA 5000

Jose Molina — Wed, 28 Feb 2007 06:19:08 GMT

Thanks, that was quite clear. I'll have to switch to qlogic and use it's own multipathing software. If someone has anything to add I'll close the thread tomorrow as solved. Thanks!

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