MSA2050/2060 MP support

[nagilum99]

I created an issue in xapi-project and noticed, that it's probably wrong placed over there: https://github.com/xapi-project/sm/issues/682

_I've seen that multipath/multipath.conf got a few upgrades. https://github.com/xapi-project/sm/commit/d732cf1ae7e7914d4dde2dd6858bf0718afae44e is the one that would affect us to properly connect an MSA 2060 FC / SAN.

I'm running XCP-ng 8.2 with current updates, but that config update didn't make it yet. # multipathd show config doesn't show it yet, so when will it make it? The 2050 is rather old by now and even the 2060 isn't 'fresh'.

(I've installed the sm-patch with CHV before and it also didn't appear under 8.2 CU1)_

[stormi]

If Citrix Hypervisor backports the change to 8.2 CU1, it will bounce into XCP-ng 8.2.1 too at some point.

However, check the instructions in multipath.conf: you can add any configuration you need yourself now, provided you do it in the right file, as described.

[Petbotson]

Hey @nagilum99 did you find a solution here?

I have a MSA 2060 i'd like to properly connect.

[olivierlambert]

@Petbotson Hi,

Just use the vendor configuration, follow the instructions in the multipath.conf. Let us know if you need help.

[nagilum99]

Hey @nagilum99 did you find a solution here?

I have a MSA 2060 i'd like to properly connect.

I updated it myself, as temporary fix. Works as it should.

[Petbotson]

So i'm not doing this everyday.

Should i just edit the file /etc/multipath/conf.d/custom.conf and add the following from https://github.com/xapi-project/sm/blob/master/multipath/multipath.conf

    device {
        vendor                      "(HP|HPE)"
        product                     "MSA [12]0[456]0 .*"
        path_selector               "round-robin 0"
        hardware_handler            "1 alua"
        path_grouping_policy        group_by_prio
        prio                        alua
        failback                    immediate
        no_path_retry               18
    }

Thanks a lot

[olivierlambert]

If you open the multipath.conf file, it explains how to do it in the header:

# --- WARNING: DO NOT EDIT THIS FILE ---                                                                                
# The contents of this file may be overwritten at any future time through a                                             
# system update, causing any custom configuration to be lost.                                                           
#                                                                                                                       
# For custom multipath configuration, create a separate .conf file in the                                               
# /etc/multipath/conf.d/ directory.                                                                                     
# --- END OF WARNING ---                                                                                                

[Petbotson]

Great. So this means if i have multiple devices that need a custom multipath config, i can not just simply put the configuration in one file? But i need multiple files? storage1.conf and storage2.conf?

[olivierlambert]

You can put it in one file, the multipath program will generate "one big" config from all the files. It's more a question of organization on your side. Both solutions are fine.

At some point, for all generic/massively used arrays, XCP-ng project will try to get it "upstream" so you don't need that.

[Petbotson]

Well for now i just created one file custom.conf and added the following lines:

    ## MSA 2060 configuration
    device {
        vendor                      "(HP|HPE)"
        product                     "MSA [12]0[456]0 .*"
        path_selector               "round-robin 0"
        hardware_handler            "1 alua"
        path_grouping_policy        group_by_prio
        prio                        alua
        failback                    immediate
        no_path_retry               18
    }

After rebooting the host, i checked with the command mpathutil status and got the following result

mpathutil status
show topology
xxxxxxxxxxxxxxxxxxxxx dm-1 HPE     ,MSA 2060 iSCSI
size=6.0T features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| |- 10:0:0:1 sdae 65:224 active ready running
| |- 6:0:0:1  sdaa 65:160 active ready running
| |- 12:0:0:1 sdag 66:0   active ready running
| `- 8:0:0:1  sdac 65:192 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
  |- 11:0:0:1 sdaf 65:240 active ready running
  |- 7:0:0:1  sdab 65:176 active ready running
  |- 13:0:0:1 sdah 66:16  active ready running
  `- 9:0:0:1  sdad 65:208 active ready running

I think it`s working, because the MSA does have two controllers of which one is inactive.

When checking the PBD details though i don't see any mention of the multiSession parameter. Shouldn't it be there?

xe pbd-param-list uuid=78ca9439-3dba-b131-6924-875bab6e6af4
uuid ( RO)                  : 78ca9439-3dba-b131-6924-875bab6e6af4
     host ( RO) [DEPRECATED]: f0e03a22-0f66-4ea9-8ead-b005fb3b5a11
             host-uuid ( RO): f0e03a22-0f66-4ea9-8ead-b005fb3b5a11
       host-name-label ( RO): host
               sr-uuid ( RO): 0f25294d-4292-bedf-6f6c-48f9f62d319e
         sr-name-label ( RO): MSA-STORAGE
         device-config (MRO): multihomelist: 10.1.1.11:3260,10.1.2.14:3260,10.1.1.13:3260,10.1.2.11:3260,10.1.1.14:3260,10.1.2.13:3260,10.1.1.12:3260,10.1.2.12:3260; target: 10.1.1.11; targetIQN: iqn.2015-11.com.hpe:storage.msa2060.baksz2233f62b4b; SCSIid: 3600c0ff000f77196af43226601000000
    currently-attached ( RO): true
          other-config (MRW): storage_driver_domain: OpaqueRef:d4b309dc-98df-4f4b-9786-852a8b387982; mpath-3600c0ff000f77196af43226601000000: [8, 8]; multipathed: true; iscsi_sessions: 8

[nagilum99]

I'd call it like the config it contains - it makes management more easy. You can see that it handles the MSA, sees 8 targets and groups them between active (preferred) and enabled (working but passive/fallback) paths. Looks good to me. We're using FC instead, but at this point it's not a bit difference.

[nagilum99]

You can put it in one file, the multipath program will generate "one big" config from all the files. It's more a question of organization on your side. Both solutions are fine.

At some point, for all generic/massively used arrays, XCP-ng project will try to get it "upstream" so you don't need that.

As stated above: This one (and several others) are already in XAPI project, you just need to pull and update your own. ;-) ...adding it for 8.3 PR would be good (also for the points of: Features added

[stormi]

For contributions of default multipath.conf updates, it directly to the XAPI project: https://github.com/xapi-project/sm

[Petbotson]

Thank you everybody. Looking forward to seeing the latest config from the sm repo in xcp-ng