Rackspace is currently suffering an outage across facilities in Europe and APAC.

“Rackspace is aware of connectivity issues in our SYD2, LON5, LON3, and HKG5 data centers. Engineers have been engaged and are working to resolve the issue,” the company announced on its status page on May 29 22:24 CT.

First reported by the Register, the company initially said the issue could have been the Dense Wavelength-Division Multiplexing (DWDM) system in London, before later ruling this out.

The company then said the outage was related to I/O limits in the multi-tenant Shared SAN environment that had reset incorrectly.

“Engineers have successfully executed a script to restore the default values for the I/O limits. As the validation is in progress, a few customers confirmed that the environments are back online,” the company posted today at 4:37 CT. “Engineers are actively engaged in manual checks and verifications to ensure the stability and proper functioning of the affected systems.”

At the time of writing, the four facilities are still showing an outage on the company’s status page.

“Some customers in the LON3 and LON5 data centers may experience issues with backup activities during this time,” the company warned its customers.

Update: An update from Rackspace posted today at 06:23 CDT notes: "It has been identified that any impacted Linux VMs (virtual machines) will not automatically recover if storage has been adjusted and will need to be manually rebooted. Rackspace engineers can reboot impacted VMs from the portal where necessary."

In December 2022, Rackspace suffered a major cyber attack against its Hosted Exchange service. The company said the incident was caused by a ‘zero-day’ exploit and that it would not be bringing back the service.