RAID Status on the Advanced tab of the host

abudef

Under what circumstances is the RAID array status displayed here? I have an mdadm RAID array on my host (dom0), but here it says "No RAID information available":

olivierlambert

Hi,

On which XCP-ng version are you?

abudef

olivierlambert
8.3 including todays candidates

olivierlambert

Hmm that would be interesting to check manually the plugin report:

xe host-call-plugin host-uuid=<uuid> plugin=raid.py fn=check_raid_pool

abudef

[18:38 vms04 ~]# xe host-call-plugin host-uuid=5f94209f-8801-4179-91d5-5bdf3eb1d3f1 plugin=raid.py fn=check_raid_pool
{}
[18:38 vms04 ~]#

[18:38 vms04 ~]# cat /proc/mdstat
Personalities : [raid0]
md0 : active raid0 sdb[1] sda[0] sdc[2]
      11720658432 blocks super 1.2 512k chunks

unused devices: <none>
[18:56 vms04 ~]# mdadm --detail /dev/md0
/dev/md0:
           Version : 1.2
     Creation Time : Fri May  2 14:43:06 2025
        Raid Level : raid0
        Array Size : 11720658432 (11177.69 GiB 12001.95 GB)
      Raid Devices : 3
     Total Devices : 3
       Persistence : Superblock is persistent

       Update Time : Fri May  2 14:43:06 2025
             State : clean
    Active Devices : 3
   Working Devices : 3
    Failed Devices : 0
     Spare Devices : 0

        Chunk Size : 512K

Consistency Policy : none

              Name : vms04:0  (local to host vms04)
              UUID : bbdc7253:792a8ada:ee21a207:4b8d52d2
            Events : 0

    Number   Major   Minor   RaidDevice State
       0       8        0        0      active sync   /dev/sda
       1       8       16        1      active sync   /dev/sdb
       2       8       32        2      active sync   /dev/sdc
[18:56 vms04 ~]#

olivierlambert

In theory, if the raid was created using the installer (so during installation), you should have /dev/md127. That's what the plugin checks:
https://github.com/xcp-ng/xcp-ng-xapi-plugins/blob/master/SOURCES/etc/xapi.d/plugins/raid.py#L18

abudef

Yeah, that's it, thanks.

device = '/dev/md0'

olivierlambert

How did you create your RAID in the first place?

abudef

The array was created later after installation manually using unused disks. And then it was connected in the normal way as a local SR using XO.

It would be nice if it would also handle the state of other mdamd RAID arrays. After all, the All mdadm RAID are healthy message kind of predetermines it

olivierlambert

The plugin was initially created to check RAID created during install, not custom RAIDs created manually. But that could be an improvement to the plugin stormi I leave you the honor to add this somewhere