Cannot take snapshots with XO

[guiltykeyboard]

Every time I try to take a snapshot in XO, I get the following message: Unknown error from the peer. When looking at it under settings > Logs, it says:

MESSAGE_REMOVED()

This is a XenServer/XCP-ng error.

This is the full text of the log:

vm.snapshot
{
  "id": "ad416996-73f5-1b47-4bd3-c4a96e913b7a"
}
{
  "code": "MESSAGE_REMOVED",
  "params": [],
  "call": {
    "method": "Async.VM.snapshot_with_quiesce",
    "params": [
      "OpaqueRef:bb24b322-2517-4f8c-8f3a-640d4f38c29b",
      "host.domain.com_2020-10-22T01:35:26.549Z"
    ]
  },
  "message": "MESSAGE_REMOVED()",
  "name": "XapiError",
  "stack": "XapiError: MESSAGE_REMOVED()
    at Function.wrap (/etc/xo/xo-builds/xen-orchestra-202002022028/packages/xen-api/src/_XapiError.js:16:11)
    at /etc/xo/xo-builds/xen-orchestra-202002022028/packages/xen-api/src/index.js:630:55
    at Generator.throw (<anonymous>)
    at asyncGeneratorStep (/etc/xo/xo-builds/xen-orchestra-202002022028/packages/xen-api/dist/index.js:58:103)
    at _throw (/etc/xo/xo-builds/xen-orchestra-202002022028/packages/xen-api/dist/index.js:60:291)
    at tryCatcher (/etc/xo/xo-builds/xen-orchestra-202002022028/node_modules/bluebird/js/release/util.js:16:23)
    at Promise._settlePromiseFromHandler (/etc/xo/xo-builds/xen-orchestra-202002022028/node_modules/bluebird/js/release/promise.js:547:31)
    at Promise._settlePromise (/etc/xo/xo-builds/xen-orchestra-202002022028/node_modules/bluebird/js/release/promise.js:604:18)
    at Promise._settlePromise0 (/etc/xo/xo-builds/xen-orchestra-202002022028/node_modules/bluebird/js/release/promise.js:649:10)
    at Promise._settlePromises (/etc/xo/xo-builds/xen-orchestra-202002022028/node_modules/bluebird/js/release/promise.js:725:18)
    at _drainQueueStep (/etc/xo/xo-builds/xen-orchestra-202002022028/node_modules/bluebird/js/release/async.js:93:12)
    at _drainQueue (/etc/xo/xo-builds/xen-orchestra-202002022028/node_modules/bluebird/js/release/async.js:86:9)
    at Async._drainQueues (/etc/xo/xo-builds/xen-orchestra-202002022028/node_modules/bluebird/js/release/async.js:102:5)
    at Immediate.Async.drainQueues (/etc/xo/xo-builds/xen-orchestra-202002022028/node_modules/bluebird/js/release/async.js:15:14)
    at runCallback (timers.js:810:20)
    at tryOnImmediate (timers.js:768:5)
    at processImmediate [as _immediateCallback] (timers.js:745:5)"
}

I tried restarting the toolstack on the host and was able to successfully take a snapshot from XCP-NG center with no issues. I'm using XCP-NG from the sources and I could try to rebuild it. Has anyone run into a similar issue?

[olivierlambert]

Hi,

Please read carefully the error message. It says: "This is a XenServer/XCP-ng error".

So it's not related directly to Xen Orchestra, but the host. That's why you should have tell us before: what XCP-ng version are you using?

[guiltykeyboard]

I'm using version 8.1 with all of the latest updates installed. The pool has two hosts currently. There was a third, but it has been removed from the pool for maintenance.

I'm not sure why it is disagreeing with the host, because it works perfectly from XCP-NG center with no complaints. It just doesn't work when requesting the snaapshot with XO-Source.

[olivierlambert]

That's because Xen Orchestra isn't a clone of XCP-ng Center.

In XO, we made the choice to automatically -by default- trying to make a coalesce snapshot. If it fails, we are automatically doing a fallback to the classical snapshot.

However, I think this fallback should be done silently. Let's check with @julien-f about this.

[julien-f]

I don't understand the problem, XO should catch this error and automatically fall back to a normal snapshot, you should not see this error in the log.

What version of XO are you using?

[guiltykeyboard]

X-O Server is 5.51.1 and XO-Web is 5.51.0.