Proxmox v4 - iSCSI Multipath problem

[xpanisello]

Hi everyone, I'm trying to configure iscsi multipath but i'm not able. I have a Netapp with two controllers, one ip address assigned for iSCSI portal on each one, when I configure the portal in Proxmox the System automatically recognize both ip, and I can access and use the luns correctly.

I can see these two devices created using fdisk -l, but when I ask for the wwid with /lib/udev/scsi_id I get the same id for these diferent devices.

 

[hec]

Host utilities installed?

cdot oder 7Mode?

 

[xpanisello]

Hi Hec, sorry, I was in worng. The wwid has to be the same for the same lun.

Yes, I've installed the multipath utilities. The problemais the multipath.conf file:

blacklist {
wwid "*"
}
blacklist_exceptions {
wwid "3600a09803830327241244735782f4e50"
}
multipaths {
multipath {
wwid "3600a09803830327241244735782f4e50"
alias mpath0
}
}
defaults {
polling_interval 2
path_selector "round-robin 0"
path_grouping_policy multibus
getuid_callout "/lib/udev/scsi_id -g -u -d /dev/%n"
rr_min_io 100
failback immediate
no_path_retry queue
}

Whe I execute multipath -ll command I get an error parsing config file. If I delete the blacklist and blacklist_exceptions sections then it Works, and this is the output of multipath -ll:

root@cook:/etc# multipath -ll
mpath0 (3600a09803830327241244735782f4e50) dm-4 NETAPP,LUN C-Mode
size=1.5T features='4 queue_if_no_path pg_init_retries 50 retain_attached_hw_handle' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 3:0:0:1 sdb 8:16 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 4:0:0:1 sdc 8:32 active ready running
root@cook:/etc#

That means that now is correct, but what happens with the blacklist and exception sections, are they incorrect? are unnecessary? Is now working well?

 

[hec]

Which line of the config file is the parsing error?

You know this? https://library.netapp.com/ecmdocs/ECMP1654943/html/index.html

Try to change at blacklist_exceptions:

wwid 3600a09803830327241244735782f4e50 --> remvoed ""

why you like to do a blacklist wwid *?

 

[xpanisello]

Hi, finally solved the problem. As I have understood multipath-tools has a configuration, you can see it if you execute the command multipathd -k, then in the multipath prompt execute show config, then list the live configuration. In this configuration I saw that the blacklist section already exists, may be that's why the error...Then I used a multipath.conf with blacklist_exceptions but not blacklist (as specified in proxmox manual), and now it works. I tested the multipath and is working very well, I disconnected one interface, and after the other (connecting the one first...) and the VM's in the iscsi lvm continued working whitout problem.