The Xen vulnerability that caused cloud reboots for Amazon Web Services, Rackspace and IBM's SoftLayer resulted in application downtime that hit the latter two vendors harder.
a survey by Rightscale found that 51 percent of respondents using Amazon avoided application downtime due to the reboot. Twenty-seven percent of the respondents using Rackspace escaped downtime and 26 percent using SoftLayer avoided outages.got most of the headlines,
Meanwhile, 18 percent of SoftLayer customers saw downtime of more than an hour followed by 13 percent at Rackspace and 5 percent for AWS.
Rightscale's survey is based on 449 respondents (349 AWS, 66 Rackspace, 42 Softlayer and 74 who used Xen on premise).
Part of the difference in downtime could be AWS' larger fleet. The Xen flaw hit less than 10 percent of AWS' fleet. AWS users also apparently relaunched instances ahead of the reboot, moved resources and used multiple availability zones.
Overall, AWS and Rackspace gave their customers the most advance notice — 36 hours ahead of the first reboot — and Softlayer gave users about 12 hours. But 72 percent of cloud customers said their vendors handled the reboot well.