University of Cambridge Computer Laboratory - Notice history

100% - uptime

Caelum Console (server management) - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%
Aug 2025100.0% uptime
Sep 2025100.0% uptime
Oct 2025100.0% uptime

Request Tracker - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%
Aug 2025100.0% uptime
Sep 2025100.0% uptime
Oct 2025100.0% uptime

Other Internal Services - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%
Aug 2025100.0% uptime
Sep 2025100.0% uptime
Oct 2025100.0% uptime

External Services - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%
Aug 2025100.0% uptime
Sep 2025100.0% uptime
Oct 2025100.0% uptime

Network - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%
Aug 2025100.0% uptime
Sep 2025100.0% uptime
Oct 2025100.0% uptime
100% - uptime

GN09 - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 99.54%
Aug 2025100.0% uptime
Sep 2025100.0% uptime
Oct 202599.54% uptime

WCDC - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%
Aug 2025100.0% uptime
Sep 2025100.0% uptime
Oct 2025100.0% uptime
100% - uptime

Main VM Pool (WCDC) - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%
Aug 2025100.0% uptime
Sep 2025100.0% uptime
Oct 2025100.0% uptime

GPUs - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 99.54%
Aug 2025100.0% uptime
Sep 2025100.0% uptime
Oct 202599.54% uptime

Secondary VM Hosts - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 99.80%
Aug 2025100.0% uptime
Sep 2025100.0% uptime
Oct 202599.80% uptime

Xen Orchestra - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%
Aug 2025100.0% uptime
Sep 2025100.0% uptime
Oct 2025100.0% uptime
100% - uptime

Filer - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%
Aug 2025100.0% uptime
Sep 2025100.0% uptime
Oct 2025100.0% uptime

Archive Server - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%
Aug 2025100.0% uptime
Sep 2025100.0% uptime
Oct 2025100.0% uptime

Data Replication - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%
Aug 2025100.0% uptime
Sep 2025100.0% uptime
Oct 2025100.0% uptime

Other Secondary Storage Systems - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%
Aug 2025100.0% uptime
Sep 2025100.0% uptime
Oct 2025100.0% uptime
100% - uptime

Third Party: Fastmail → General Availability - Operational

Third Party: Fastmail → Mail delivery - Operational

Third Party: Fastmail → Web client and mobile app - Operational

Third Party: Fastmail → Mail access (IMAP/POP) - Operational

Third Party: Fastmail → Login & sessions - Operational

Third Party: Fastmail → Contacts (CardDAV) - Operational

Notice history

Oct 2025

West Cambridge electrical instability
  • Resolved
    Resolved

    The electrical supply has been stable since 11:05.

    However the UK Power Networks incident is still open and indicates that the electrical supply to northwest Cambridge is currently rerouted around a faulty HV cable; this means there may be future brief interruptions whilst the fault is repaired. We don't know when this will happen or how disruptive it will be.

  • Update
    Update

    A further electrical supply problem occurred at 11:05; PCs in offices and non-UPS-protected servers in GN09 may have again powered off or rebooted.

  • Monitoring
    Monitoring

    We are aware of an instability of the electrical supply ("brown out") in the William Gates Building around 10:12. This caused some network infrastructure and some computers (including some servers in GN09) to reboot but we believe that everything affected should now be working again. Contact service-desk@cst.cam.ac.uk if you are aware of any remaining problems.

GN09 cooling fault
  • Resolved
    Resolved

    This incident has been resolved.

    Please contact service-desk@cst.cam.ac.uk if you are experiencing any ongoing issues.

  • Update
    Update

    Caelum users are free to turn their servers on again via the Caelum Console.

    VM users are free to turn their VMs on again via Xen Orchestra.

  • Update
    Update

    The chiller is operational again. We will start to bring affected services back online. This will take time and we will provide another update when this is complete.

  • Identified
    Identified

    Cooling for GN09 is currently inoperable. Engineers are on the way, but due to climbing temperatures, we will have to shut down all research and teaching servers shortly.

Sep 2025

West Cambridge Data Centre full outage for planned electrical works
  • Completed
    19 September, 2025 at 08:50
    Completed
    19 September, 2025 at 08:50

    Maintenance was completed successfully.

  • Update
    18 September, 2025 at 17:27
    In progress
    18 September, 2025 at 17:27

    We are aware that some research/teaching virtual machines belonging to individuals and research groups have not automatically started. These are VMs that are not configured to automatically start, so we are not sure whether they are actually meant to be running. If your VM has not started and should be running continuously, contact us and we'll rectify this for next time.

  • Update
    18 September, 2025 at 14:10
    In progress
    18 September, 2025 at 14:10

    Departmental IT services have been restored. Please contact service-desk@cst.cam.ac.uk if you encounter any remaining problems with these.

    University-wide services are still being restored, per UIS's announced schedule, and may not be fully available again until tomorrow.

    Some further work is needed to undo some temporary changes to departmental infrastructure, which will take place out-of-hours.

  • Update
    18 September, 2025 at 13:46
    In progress
    18 September, 2025 at 13:46

    UIS has announced that the planned electrical works in WCDC have completed early. We are starting to restore our services now. This will take time to complete.

  • Update
    18 September, 2025 at 12:40
    In progress
    18 September, 2025 at 12:40

    Power was unexpectedly restored around 13:10 before the maintenance was announced as complete. This caused many systems to automatically start again. For safety, we are shutting affected systems down again now in case power is again lost.

  • In progress
    17 September, 2025 at 16:12
    In progress
    17 September, 2025 at 16:12

    Maintenance is now in progress. Systems will gradually shut down over the course of this evening, and will not come back up until Thursday evening at the soonest.

    We will start with some relatively low-impact network infrastructure firmware upgrades (which will cause intermittent loss of connectivity to Morello systems in WCDC) and storage software updates, and will then proceed to shut down our VM infrastructure.

  • Update
    17 September, 2025 at 16:00
    Planned
    17 September, 2025 at 16:00

    This maintenance will not start until 17 September. Our status page platform has sent out a couple of incorrect emails about the timing of this maintenance; apologies for the confusion.


    As previously announced, UIS have notified us that essential electrical works will be carried out at the West Cambridge Data Centre (WCDC) on 18 September 09:00-17:00. The entire data centre will be switched off all day.

    This will affect many departmental services (several of our servers are hosted in WCDC) as well as other services in the broader University. Many departmental services will be shut down on the evening of 17 September and will remain offline until at least the evening of 18 September.

    More details on the precise impact:

    The following departmental systems will be unavailable:

    • Departmental databases: dbwebserver, svr-win-db

    • All research and teaching VMs, except dev-gpu-* and dev-cpu-*

    • SSH servers: ely, svr-ssh-0 (use slogin.cl.cam.ac.uk instead which will be changed to point at svr-ssh-1, hosted elsewhere)

    • Webadmin

    • Verex

    • Archive servers (archive / berilia; archive-smb / jerakeen)

    • Licence servers: lmserv-*

    • Cron servers (cron-serv*)

    • Weather station

    • Undergraduate SSH servers: cl-student-ssh, cl-teaching-ecad

    • WSUS

    • Misc utility websites on svr-www-02, svr-www-03, www-dyn*

    • Legacy Windows remote desktop service (clrds / desktop)

    • Legacy Subversion server (svn1)

    • Legacy printing (CUPS, mDNS/Bonjour)

    • Legacy VPL servers

    • Legacy wiki server

    • Morello: entire cluster

    • EEG: beara, gola

    • SRCF: egress, echo, enid

    • TFC: tfc-app{1,2,4,10,11}

    UIS have told us that the following University-wide services will be down all day on 18 September:

    • The University Finance System (UFS)

    • Cognos

    • The Research Dashboard

    • Tableau

    • Research Computing Services will be unavailable from approximately 10:00 on 17 September until 17:00 on 19 September. This includes:

      • Cambridge Research Cloud (Arcus)

      • Cambridge Service for Data Driven Discovery (CSD3)

      • Dawn

      • Research Cold Store (RCS)

      • Research Data Store (RDS)

      • Research File Store (RFS)

      • Secure Research Computing Platform (SRCP)

    The following departmental systems will be operating without resilience and are at risk of disruption:

    • VPN2

    • Active Directory (adsrv07)

    • DNS (authoritative and recursive)

    • LDAP

    • DHCP

    • MSA, MTA (SMTP outbound)

    • TGT servers

    • Legacy email (on filer / using .forward files)

    • cl-onserver / laira, march

    • Filer disaster-recovery snapshots

    The following departmental systems will have their outage mitigated, i.e. they will be rehomed in the William Gates Building prior to the outage:

    • Request Tracker

    • www.cl.cam.ac.uk, sysdata.cl.cam.ac.uk (svr-www-00, svr-www-01)

    • Xen Orchestra

  • Planned
    17 September, 2025 at 16:00
    Planned
    17 September, 2025 at 16:00

    This maintenance will not start until 17 September. Our status page platform has sent out a couple of incorrect emails about the timing of this maintenance; apologies for the confusion.


    UIS have notified us that essential electrical works will be carried out at the West Cambridge Data Centre (WCDC) on 18 September 09:00-17:00. The entire data centre will be switched off all day.

    This will affect many departmental services (several of our servers are hosted in WCDC) as well as other services in the broader University. Many departmental services will be shut down on the evening of 17 September and will remain offline until at least the evening of 18 September.

    We are planning the precise departmental impact and possible mitigations, and will add more information to this page in due course.

    We know however that most departmental-hosted VMs (except GPU VMs) and departmental administrative systems (for example dbwebserver and the underlyng databases) will be shut down for the duration.

Aug 2025

No notices reported this month

Aug 2025 to Oct 2025

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