Subcategories

• Management

  VMs, hosts, pools, networks and all other usual management tasks.
  491 Topics

  4k Posts

  L

  It's a been a while since this thread has been updated, so I figure I should share what I've learned. First: here's a script which reproduces the bug reliably and includes steps to revert: https://gist.github.com/dmeiselman/ecb35ffcb675c38e6eeb14292948c2e3 Don't run this on your production cluster. Here's my understanding of this bug and it's current state: Some operation sets the snapshot_of metadata field of a valid snapshot to NULL (We can do this intentionally by making a VM, taking a snapshot of it, then deleting the parent disk.) If you perform a revert of this invalid snapshot, revert's "Updating the snapshot_of fields" step looks for VDIs whose snapshot_of matches the snapshot's source disk, so it can relink them to the new disk. If the source is NULL, the search becomes "every VDI with NULL", which matches ISOs, base images, ordinary VM disks. Congrats, every real disk and ISO in every SR now looks like a snapshot. Now these disks have a value set for snapshot_of which means XOA hides the VDI in the web UI. The fix is to delete or clone the super-parent, and all of its snapshots. sr_scan will correct the metadata for all the VMs and ISOs and you're back where you started. This happens in line 401 of https://github.com/xapi-project/xen-api/blob/v26.1.19/ocaml/xapi/xapi_vm_snapshot.ml#L389-L408 PR 7290 https://github.com/xapi-project/xen-api/pull/7290 has a fix, which looks like it's coming in xapi v26.1.21. (It's worth reading the Pull Request, as it has a more graceful description of the issue, it really helped me wrap my head around it.)
• Advanced features

  ACLs, Self-service, Cloud-init, Load balancing...
  107 Topics

  874 Posts

  P

  @dknight-bg the Feeder post you linked asks for two things: sending audit events to syslog, which is what this PR does, and recording successful logins, which as far as I can tell the PR doesn't touch. If others reading this need either one, a vote on https://feedback.vates.tech/posts/88/audit-log-forward-events-to-remote-syslog-record-successful-logins is the easiest way to show it. The PR is still waiting for a reviewer, as far as I can see.
• Backup

  All XO backup features: full and incremental, replication, mirrors...
  543 Topics

  6k Posts

  R

  Update: switching the remote to “multiple data blocks” fixed the 2 TiB overflow. The full backup now succeeds (≈1.1M blocks, 13 h) and file restore works. However, the next incremental always falls back to a full The delta export request gets no data for exactly 5 minutes, then undici’s body timeout fires. So “can’t compute delta” is actually a timeout. My guess is that the host takes more than 5 min to compute the qcow2 delta of a 3 TB disk before sending the first byte (single SATA SMR disk, local EXT SR). XapiQcow2StreamSource.close() throws because the source was never initialized. In earlier attempts, this may have left tapdisks for the qcow2 snapshots stuck and attached to dom0 (tap-ctl close timing out, SR_BACKEND_FAILURE_1200). I had to kill them manually before the VBDs could be unplugged. CBT is disabled on all VDIs. Is there a way to increase this timeout for qcow2 delta exports, or is a fix planned (e.g. keep-alive while the delta is computed)? Is the close() error on an uninitialized source a known bug? Same environment as above (XO from sources 3923756ff, XCP-ng 8.3.0, sm-3.2.12-25.1).
• REST API

  Everything related to Xen Orchestra's REST API
  89 Topics

  656 Posts

  P

  Hi, This was fixed in Latest. But if you need to stay on Stable, you can open a ticket to have a patch.
• Infrastructure as Code

  Terraform, Packer or any tool to do IaC
  54 Topics

  506 Posts

  D

  @julienXOvates said: Just discussed this with @nathanael-h; I would strongly recommend using the load balancer plugin in XO and create some VM-to-host affinity rules, so that your CP VMs are running on different hosts ! So when the RPU comes you would have minimum impact. Yeah the Load Balancer plugin is an option, though not in my plan. I could certainly get it by using XOCE for free though. I wonder if Host Affinity might work as well...