XOSTOR hyperconvergence preview

tanonl

Hi,
I am actually new to XOSTOR and I have very basic questions to begin with.
Does it support only Pools ? Can we attach such SR on many independent XCP-ng hosts?

Thanks again for this incredible project.

olivierlambert

Hi,

It works only at pool level, the only way have coordination between hosts and knowing which host have the lock on which VM. This is essential to avoid booting the same VM/disk at 2 different places without knowing, leading to data corruption.

fatek

@olivierlambert said in XOSTOR hyperconvergence preview:

FINALLY YOU CAN CREATE THE SR:
Otherwise with thin provisioning:

xe sr-create type=linstor name-label=<SR_NAME> host-uuid=<MASTER_UUID> device-config:group-name=linstor_group/thin_device device-config:redundancy=<REDUNDANCY> shared=tru

Is this part of the command not needed?

device-config:hosts=XCP-01,XCP-02,XCP-xx

olivierlambert

question for @ronan-a

ronan-a

@fatek No. I removed this param, it's useless now.

Maelstrom96

@ronan-a Since XOSTOR is supposed to be stable now, I figured I would try it out with a new setup of 3 newly installed 8.2 nodes.

I used the CLI to deploy it. It all went well, and the SR was quickly ready. I was even able to migrate a disk to the Linstor SR and boot the VM. However, after rebooting the master, it seems like the SR doesn't want to allow any disk migration, and manual Scan are failing. I've tried unmounting/remounting the SR fully, restarting the toolstack, but nothing seems to help. The disk that was on Linstor is still accessible and the VM is able to boot.

Here is the error I'm getting:

sr.scan
{
  "id": "e1a9bf4d-26ad-3ef6-b4a5-db98d012e0d9"
}
{
  "code": "SR_BACKEND_FAILURE_47",
  "params": [
    "",
    "The SR is not available [opterr=Database is not mounted]",
    ""
  ],
  "task": {
    "uuid": "a467bd90-8d47-09cc-b8ac-afa35056ff25",
    "name_label": "Async.SR.scan",
    "name_description": "",
    "allowed_operations": [],
    "current_operations": {},
    "created": "20240502T21:40:00Z",
    "finished": "20240502T21:40:01Z",
    "status": "failure",
    "resident_on": "OpaqueRef:b3e2f390-f45f-4614-a150-1eee53f204e1",
    "progress": 1,
    "type": "<none/>",
    "result": "",
    "error_info": [
      "SR_BACKEND_FAILURE_47",
      "",
      "The SR is not available [opterr=Database is not mounted]",
      ""
    ],
    "other_config": {},
    "subtask_of": "OpaqueRef:NULL",
    "subtasks": [],
    "backtrace": "(((process xapi)(filename lib/backtrace.ml)(line 210))((process xapi)(filename ocaml/xapi/storage_access.ml)(line 32))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 35))((process xapi)(filename ocaml/xapi/message_forwarding.ml)(line 131))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename ocaml/xapi/rbac.ml)(line 205))((process xapi)(filename ocaml/xapi/server_helpers.ml)(line 95)))"
  },
  "message": "SR_BACKEND_FAILURE_47(, The SR is not available [opterr=Database is not mounted], )",
  "name": "XapiError",
  "stack": "XapiError: SR_BACKEND_FAILURE_47(, The SR is not available [opterr=Database is not mounted], )
    at Function.wrap (file:///opt/xo/xo-builds/xen-orchestra-202404270302/packages/xen-api/_XapiError.mjs:16:12)
    at default (file:///opt/xo/xo-builds/xen-orchestra-202404270302/packages/xen-api/_getTaskResult.mjs:11:29)
    at Xapi._addRecordToCache (file:///opt/xo/xo-builds/xen-orchestra-202404270302/packages/xen-api/index.mjs:1029:24)
    at file:///opt/xo/xo-builds/xen-orchestra-202404270302/packages/xen-api/index.mjs:1063:14
    at Array.forEach (<anonymous>)
    at Xapi._processEvents (file:///opt/xo/xo-builds/xen-orchestra-202404270302/packages/xen-api/index.mjs:1053:12)
    at Xapi._watchEvents (file:///opt/xo/xo-builds/xen-orchestra-202404270302/packages/xen-api/index.mjs:1226:14)"
}

I quickly glanced over the source code and the SM logs to see if I could identify what was going on but it doesn't seem to be a simple thing.

Logs from SM:

May  2 13:22:02 xcp-ng-labs-host01 SM: [19242] LinstorSR.scan for e1a9bf4d-26ad-3ef6-b4a5-db98d012e0d9
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242] Raising exception [47, The SR is not available [opterr=Database is not mounted]]
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242] lock: released /var/lock/sm/e1a9bf4d-26ad-3ef6-b4a5-db98d012e0d9/sr
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242] ***** generic exception: sr_scan: EXCEPTION <class 'SR.SROSError'>, The SR is not available [opterr=Database is not mounted]
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242]   File "/opt/xensource/sm/SRCommand.py", line 110, in run
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242]     return self._run_locked(sr)
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242]   File "/opt/xensource/sm/SRCommand.py", line 159, in _run_locked
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242]     rv = self._run(sr, target)
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242]   File "/opt/xensource/sm/SRCommand.py", line 364, in _run
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242]     return sr.scan(self.params['sr_uuid'])
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242]   File "/opt/xensource/sm/LinstorSR", line 536, in wrap
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242]     return load(self, *args, **kwargs)
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242]   File "/opt/xensource/sm/LinstorSR", line 521, in load
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242]     return wrapped_method(self, *args, **kwargs)
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242]   File "/opt/xensource/sm/LinstorSR", line 381, in wrapped_method
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242]     return method(self, *args, **kwargs)
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242]   File "/opt/xensource/sm/LinstorSR", line 777, in scan
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242]     opterr='Database is not mounted'
May  2 13:22:02 xcp-ng-labs-host01 SM: [19242]

olivierlambert

Have you restarted the satellites?

ronan-a

@Maelstrom96 said in XOSTOR hyperconvergence preview:

However, after rebooting the master, it seems like the SR doesn't want to allow any disk migration, and manual Scan are failing.

What's the status of these commands on each host?

systemctl status linstor-controller
systemctl status linstor-satellite
systemctl status drbd-reactor
mountpoint /var/lib/linstor
drbdsetup events2

Also please share your SMlog files.

Maelstrom96

@ronan-a said in XOSTOR hyperconvergence preview:

drbdsetup events2

Host1:

[09:49 xcp-ng-labs-host01 ~]# systemctl status linstor-controller
● linstor-controller.service - drbd-reactor controlled linstor-controller
   Loaded: loaded (/usr/lib/systemd/system/linstor-controller.service; disabled; vendor preset: disabled)
  Drop-In: /run/systemd/system/linstor-controller.service.d
           └─reactor.conf
   Active: active (running) since Thu 2024-05-02 13:24:32 PDT; 20h ago
 Main PID: 21340 (java)
   CGroup: /system.slice/linstor-controller.service
           └─21340 /usr/lib/jvm/jre-11/bin/java -Xms32M -classpath /usr/share/linstor-server/lib/conf:/usr/share/linstor-server/lib/* com.linbit.linstor.core.Controller --logs=/var/log/linstor-controller --config-directory=/etc/linstor
[09:49 xcp-ng-labs-host01 ~]# systemctl status linstor-satellite
● linstor-satellite.service - LINSTOR Satellite Service
   Loaded: loaded (/usr/lib/systemd/system/linstor-satellite.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/linstor-satellite.service.d
           └─override.conf
   Active: active (running) since Wed 2024-05-01 16:04:05 PDT; 1 day 17h ago
 Main PID: 1947 (java)
   CGroup: /system.slice/linstor-satellite.service
           ├─1947 /usr/lib/jvm/jre-11/bin/java -Xms32M -classpath /usr/share/linstor-server/lib/conf:/usr/share/linstor-server/lib/* com.linbit.linstor.core.Satellite --logs=/var/log/linstor-satellite --config-directory=/etc/linstor
           ├─2109 drbdsetup events2 all
           └─2347 /usr/sbin/dmeventd
[09:49 xcp-ng-labs-host01 ~]# systemctl status drbd-reactor
● drbd-reactor.service - DRBD-Reactor Service
   Loaded: loaded (/usr/lib/systemd/system/drbd-reactor.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/drbd-reactor.service.d
           └─override.conf
   Active: active (running) since Wed 2024-05-01 16:04:11 PDT; 1 day 17h ago
     Docs: man:drbd-reactor
           man:drbd-reactorctl
           man:drbd-reactor.toml
 Main PID: 1950 (drbd-reactor)
   CGroup: /system.slice/drbd-reactor.service
           ├─1950 /usr/sbin/drbd-reactor
           └─1976 drbdsetup events2 --full --poll
[09:49 xcp-ng-labs-host01 ~]# mountpoint /var/lib/linstor
/var/lib/linstor is a mountpoint
[09:49 xcp-ng-labs-host01 ~]# drbdsetup events2
exists resource name:xcp-persistent-database role:Primary suspended:no force-io-failures:no may_promote:no promotion_score:10103
exists connection name:xcp-persistent-database peer-node-id:1 conn-name:xcp-ng-labs-host03 connection:Connected role:Secondary
exists connection name:xcp-persistent-database peer-node-id:2 conn-name:xcp-ng-labs-host02 connection:Connected role:Secondary
exists device name:xcp-persistent-database volume:0 minor:1000 backing_dev:/dev/linstor_group/xcp-persistent-database_00000 disk:UpToDate client:no quorum:yes
exists peer-device name:xcp-persistent-database peer-node-id:1 conn-name:xcp-ng-labs-host03 volume:0 replication:Established peer-disk:UpToDate peer-client:no resync-suspended:no
exists path name:xcp-persistent-database peer-node-id:1 conn-name:xcp-ng-labs-host03 local:ipv4:10.100.0.200:7000 peer:ipv4:10.100.0.202:7000 established:yes
exists peer-device name:xcp-persistent-database peer-node-id:2 conn-name:xcp-ng-labs-host02 volume:0 replication:Established peer-disk:UpToDate peer-client:no resync-suspended:no
exists path name:xcp-persistent-database peer-node-id:2 conn-name:xcp-ng-labs-host02 local:ipv4:10.100.0.200:7000 peer:ipv4:10.100.0.201:7000 established:yes
exists resource name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 role:Secondary suspended:no force-io-failures:no may_promote:no promotion_score:10103
exists connection name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:1 conn-name:xcp-ng-labs-host03 connection:Connected role:Secondary
exists connection name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:0 conn-name:xcp-ng-labs-host02 connection:Connected role:Primary
exists device name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 volume:0 minor:1001 backing_dev:/dev/linstor_group/xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0_00000 disk:UpToDate client:no quorum:yes
exists peer-device name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:1 conn-name:xcp-ng-labs-host03 volume:0 replication:Established peer-disk:UpToDate peer-client:no resync-suspended:no
exists path name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:1 conn-name:xcp-ng-labs-host03 local:ipv4:10.100.0.200:7001 peer:ipv4:10.100.0.202:7001 established:yes
exists peer-device name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:0 conn-name:xcp-ng-labs-host02 volume:0 replication:Established peer-disk:UpToDate peer-client:no resync-suspended:no
exists path name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:0 conn-name:xcp-ng-labs-host02 local:ipv4:10.100.0.200:7001 peer:ipv4:10.100.0.201:7001 established:yes
exists -

Host2:

[09:51 xcp-ng-labs-host02 ~]# systemctl status linstor-controller
● linstor-controller.service - drbd-reactor controlled linstor-controller
   Loaded: loaded (/usr/lib/systemd/system/linstor-controller.service; disabled; vendor preset: disabled)
  Drop-In: /run/systemd/system/linstor-controller.service.d
           └─reactor.conf
   Active: inactive (dead)
[09:51 xcp-ng-labs-host02 ~]# systemctl status linstor-satellite
● linstor-satellite.service - LINSTOR Satellite Service
   Loaded: loaded (/usr/lib/systemd/system/linstor-satellite.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/linstor-satellite.service.d
           └─override.conf
   Active: active (running) since Thu 2024-05-02 10:26:59 PDT; 23h ago
 Main PID: 1990 (java)
   CGroup: /system.slice/linstor-satellite.service
           ├─1990 /usr/lib/jvm/jre-11/bin/java -Xms32M -classpath /usr/share/linstor-server/lib/conf:/usr/share/linstor-server/lib/* com.linbit.linstor.core.Satellite --logs=/var/log/linstor-satellite --config-directory=/etc/linstor
           ├─2128 drbdsetup events2 all
           └─2552 /usr/sbin/dmeventd
[09:51 xcp-ng-labs-host02 ~]# systemctl status drbd-reactor
● drbd-reactor.service - DRBD-Reactor Service
   Loaded: loaded (/usr/lib/systemd/system/drbd-reactor.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/drbd-reactor.service.d
           └─override.conf
   Active: active (running) since Thu 2024-05-02 10:27:07 PDT; 23h ago
     Docs: man:drbd-reactor
           man:drbd-reactorctl
           man:drbd-reactor.toml
 Main PID: 1989 (drbd-reactor)
   CGroup: /system.slice/drbd-reactor.service
           ├─1989 /usr/sbin/drbd-reactor
           └─2035 drbdsetup events2 --full --poll
[09:51 xcp-ng-labs-host02 ~]# mountpoint /var/lib/linstor
/var/lib/linstor is not a mountpoint
[09:51 xcp-ng-labs-host02 ~]# drbdsetup events2
exists resource name:xcp-persistent-database role:Secondary suspended:no force-io-failures:no may_promote:no promotion_score:10103
exists connection name:xcp-persistent-database peer-node-id:0 conn-name:xcp-ng-labs-host01 connection:Connected role:Primary
exists connection name:xcp-persistent-database peer-node-id:1 conn-name:xcp-ng-labs-host03 connection:Connected role:Secondary
exists device name:xcp-persistent-database volume:0 minor:1000 backing_dev:/dev/linstor_group/xcp-persistent-database_00000 disk:UpToDate client:no quorum:yes
exists peer-device name:xcp-persistent-database peer-node-id:0 conn-name:xcp-ng-labs-host01 volume:0 replication:Established peer-disk:UpToDate peer-client:no resync-suspended:no
exists path name:xcp-persistent-database peer-node-id:0 conn-name:xcp-ng-labs-host01 local:ipv4:10.100.0.201:7000 peer:ipv4:10.100.0.200:7000 established:yes
exists peer-device name:xcp-persistent-database peer-node-id:1 conn-name:xcp-ng-labs-host03 volume:0 replication:Established peer-disk:UpToDate peer-client:no resync-suspended:no
exists path name:xcp-persistent-database peer-node-id:1 conn-name:xcp-ng-labs-host03 local:ipv4:10.100.0.201:7000 peer:ipv4:10.100.0.202:7000 established:yes
exists resource name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 role:Primary suspended:no force-io-failures:no may_promote:no promotion_score:10103
exists connection name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:2 conn-name:xcp-ng-labs-host01 connection:Connected role:Secondary
exists connection name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:1 conn-name:xcp-ng-labs-host03 connection:Connected role:Secondary
exists device name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 volume:0 minor:1001 backing_dev:/dev/linstor_group/xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0_00000 disk:UpToDate client:no quorum:yes
exists peer-device name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:2 conn-name:xcp-ng-labs-host01 volume:0 replication:Established peer-disk:UpToDate peer-client:no resync-suspended:no
exists path name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:2 conn-name:xcp-ng-labs-host01 local:ipv4:10.100.0.201:7001 peer:ipv4:10.100.0.200:7001 established:yes
exists peer-device name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:1 conn-name:xcp-ng-labs-host03 volume:0 replication:Established peer-disk:UpToDate peer-client:no resync-suspended:no
exists path name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:1 conn-name:xcp-ng-labs-host03 local:ipv4:10.100.0.201:7001 peer:ipv4:10.100.0.202:7001 established:yes
exists -

Host3:

[09:51 xcp-ng-labs-host03 ~]# systemctl status linstor-controller
● linstor-controller.service - drbd-reactor controlled linstor-controller
   Loaded: loaded (/usr/lib/systemd/system/linstor-controller.service; disabled; vendor preset: disabled)
  Drop-In: /run/systemd/system/linstor-controller.service.d
           └─reactor.conf
   Active: inactive (dead)
[09:52 xcp-ng-labs-host03 ~]# systemctl status linstor-satellite
● linstor-satellite.service - LINSTOR Satellite Service
   Loaded: loaded (/usr/lib/systemd/system/linstor-satellite.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/linstor-satellite.service.d
           └─override.conf
   Active: active (running) since Thu 2024-05-02 10:10:16 PDT; 23h ago
 Main PID: 1937 (java)
   CGroup: /system.slice/linstor-satellite.service
           ├─1937 /usr/lib/jvm/jre-11/bin/java -Xms32M -classpath /usr/share/linstor-server/lib/conf:/usr/share/linstor-server/lib/* com.linbit.linstor.core.Satellite --logs=/var/log/linstor-satellite --config-directory=/etc/linstor
           ├─2151 drbdsetup events2 all
           └─2435 /usr/sbin/dmeventd
[09:52 xcp-ng-labs-host03 ~]# systemctl status drbd-reactor
● drbd-reactor.service - DRBD-Reactor Service
   Loaded: loaded (/usr/lib/systemd/system/drbd-reactor.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/drbd-reactor.service.d
           └─override.conf
   Active: active (running) since Thu 2024-05-02 10:10:26 PDT; 23h ago
     Docs: man:drbd-reactor
           man:drbd-reactorctl
           man:drbd-reactor.toml
 Main PID: 1939 (drbd-reactor)
   CGroup: /system.slice/drbd-reactor.service
           ├─1939 /usr/sbin/drbd-reactor
           └─1981 drbdsetup events2 --full --poll
[09:52 xcp-ng-labs-host03 ~]# mountpoint /var/lib/linstor
/var/lib/linstor is not a mountpoint
[09:52 xcp-ng-labs-host03 ~]# drbdsetup events2
exists resource name:xcp-persistent-database role:Secondary suspended:no force-io-failures:no may_promote:no promotion_score:10103
exists connection name:xcp-persistent-database peer-node-id:0 conn-name:xcp-ng-labs-host01 connection:Connected role:Primary
exists connection name:xcp-persistent-database peer-node-id:2 conn-name:xcp-ng-labs-host02 connection:Connected role:Secondary
exists device name:xcp-persistent-database volume:0 minor:1000 backing_dev:/dev/linstor_group/xcp-persistent-database_00000 disk:UpToDate client:no quorum:yes
exists peer-device name:xcp-persistent-database peer-node-id:0 conn-name:xcp-ng-labs-host01 volume:0 replication:Established peer-disk:UpToDate peer-client:no resync-suspended:no
exists path name:xcp-persistent-database peer-node-id:0 conn-name:xcp-ng-labs-host01 local:ipv4:10.100.0.202:7000 peer:ipv4:10.100.0.200:7000 established:yes
exists peer-device name:xcp-persistent-database peer-node-id:2 conn-name:xcp-ng-labs-host02 volume:0 replication:Established peer-disk:UpToDate peer-client:no resync-suspended:no
exists path name:xcp-persistent-database peer-node-id:2 conn-name:xcp-ng-labs-host02 local:ipv4:10.100.0.202:7000 peer:ipv4:10.100.0.201:7000 established:yes
exists resource name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 role:Secondary suspended:no force-io-failures:no may_promote:no promotion_score:10103
exists connection name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:2 conn-name:xcp-ng-labs-host01 connection:Connected role:Secondary
exists connection name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:0 conn-name:xcp-ng-labs-host02 connection:Connected role:Primary
exists device name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 volume:0 minor:1001 backing_dev:/dev/linstor_group/xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0_00000 disk:UpToDate client:no quorum:yes
exists peer-device name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:2 conn-name:xcp-ng-labs-host01 volume:0 replication:Established peer-disk:UpToDate peer-client:no resync-suspended:no
exists path name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:2 conn-name:xcp-ng-labs-host01 local:ipv4:10.100.0.202:7001 peer:ipv4:10.100.0.200:7001 established:yes
exists peer-device name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:0 conn-name:xcp-ng-labs-host02 volume:0 replication:Established peer-disk:UpToDate peer-client:no resync-suspended:no
exists path name:xcp-volume-ace70b43-4950-49f7-9de2-cf9c358dc2b0 peer-node-id:0 conn-name:xcp-ng-labs-host02 local:ipv4:10.100.0.202:7001 peer:ipv4:10.100.0.201:7001 established:yes
exists -

Will be sending the debug file as a DM.

Edit: Just as a sanity check, I tried to reboot the master instead of just restarting the toolstack, and the linstor SR seems to be working as expected again. The XOSTOR tab in XOA now populates (it just errored out before) and the SR scan now goes through.

Edit2: Was able to move a VDI, but then, the same exact error started to happen again. No idea why.

Theoi-Meteoroi

You lost quorum.

I would start looking at DRBD - that is the underlying part that isn't working at the moment. When I deployed this I wanted to understand the parts. Key to the Linstor layer - drbd stores the cluster state and membership.

I'd advise reading the DRBD docs as well as the Linstor docs to find the commands you need to stand this back up. I really don't advise using anything spinning for disk. SSD and NVMe is the ticket. You can make rust work but its terminally slow. I found 3TB disk was ok ( ~60MB/sec ) but 9.1 (10 ) TB were just awful at with 20-40MB/sec the best I saw. I removed all the XOSTOR stuff this week to maybe reinstall on some 4TB NVMe.

The upside of all that time learning drbd and linstor was helpful when I decided to use the Piraeus operator at the kubernetes level. Its basically all the same bits built from source on the nodes you deploy on and includes a CSI driver.

ronan-a

@Theoi-Meteoroi said in XOSTOR hyperconvergence preview:

You lost quorum.

Not a quorum issue:

exists device name:xcp-persistent-database volume:0 minor:1000 backing_dev:/dev/linstor_group/xcp-persistent-database_00000 disk:UpToDate client:no quorum:yes

ronan-a

@Maelstrom96 Thank you for the logs, I'm trying to understand the issue.
For the moment I don't see a problem regarding the status of the services.

ronan-a

@Maelstrom96 It sounds like a race condition or a bad mount of the database. But I'm not sure, so I will add more logs for the next RPM. We plan to release it in a few weeks.

Maelstrom96

@ronan-a I will be testing my theory a little bit later today, but I believe it might be a hostname mismatch between the node name it expects in linstor and what it set to now on Dom0. We had the hostname of the node updated before the cluster was spinned up, but I think it still had the previous name active when the linstor SR was created.

This means that the node name doesn't match here:
https://github.com/xcp-ng/sm/blob/e951676098c80e6da6de4d4653f496b15f5a8cb9/drivers/linstorvolumemanager.py#L2641C21-L2641C41

I will try to revert the hostname and see if it fixes everything.

Edit: Just tested and reverted the hostname to the default one, which matches what's in linstor, and it works again. So seems like changing a hostname after the cluster is provisionned is a no-no.

ronan-a

@Maelstrom96 Oh! This explanation makes sense, thank you. Yes in case of change of hostname, the LINSTOR node name must also be modified, otherwise the path to the database resource will not be found.

Maelstrom96

@ronan-a Do you know of a way to update a node name in Linstor? I've tried to look in their documentation and checked through CLI commands but couldn't find a way.

ronan-a

@Maelstrom96 Well there is no simple helper to do that using the CLI.

So you can create a new node using:

linstor node create --node-type Combined <NAME> <IP>

Then you must evacuate the old node to preserve the replication count:

linstor node evacuate <OLD_NAME>

Next, you can change your hostname an restart the services on each host:

systemctl stop linstor-controller
systemctl restart linstor-satellites

Finally you can delete the node:

linstor node delete <OLD_NAME>

After that you must recreate the diskless resources if necessary. Exec linstor advise r to see the commands to execute.

Maelstrom96

@ronan-a Thanks a lot for that procedure.

Ended up needing to do a little bit more, since for some reason, "evacuate" failed. I deleted the node and then went and just manually recreated my resources using:

linstor resource create --auto-place +1 <resource_name>

Which didn't work at first because the new node didn't have a storage-pool configured, which required this command to work (NOTE - This is only valid if your SR was setup as thin):

linstor storage-pool create lvmthin <node_name> xcp-sr-linstor_group_thin_device linstor_group/thin_device

Also, worth nothing that before actually re-creating the resources, you might want to manually clean up the lingering Logical Volumes that weren't cleaned up if evacuate failed.

Find volumes with:

lvdisplay

and then delete them with:

lvremove <LV Path>

example:

lvremove /dev/linstor_group/xcp-persistent-database_00000

flibbi

I've using xcp-ng with NFS Shared Storage for some months now and I am happy with it so far.
I've some ssds in a 3 server setup and I'd like to test xostor. Before I will setup xostor, there are some questions regarding it, as I am only familiar with virtuozzo/acronis-storage and ceph so far. Are there the same restrictions for using xostor, that exists in ceph e.g.?

only enterprise ssds because of power loss protection
do not use Raids ( especially Raid 0 ) if the controller is capable of using HBA Mode. I've an Dell H330 Controller and if Raid is no problem, I'd like to setup OS with Hardware Raid 1 and xostor on the rest of the ssds with raid0 arrays per each disk. If HBA mode is prefered, I need to stick with Software Raid 1, I think. Software Raid 1 is working fine, but I've had some problems in the past if the boot drive of the mirror died...
I've installed xen-orchestra manually. Once xostor is installed, will the xostor button in xen orchestra will have a function or is it only available within the XOA appliance?

Thanks for your answers!

olivierlambert

That shouldn't be a problem, if it's bad on one disk for one host, it should be resync. It's not a big filesystem shared, it's only a block space split between each created virtual disk.
That should work fine (@ronan-a will confirm but I don't think there's very low level optimization that could be affected by a RAID card?)
XOSTOR UI is only available in XOA, but you'll be able to manage and have all the features from the CLI