Windows Azure Uptime Report: OakLeaf Table Test Harness for August 2010 (99.96%)

Following is the Pingdom monthly report for a single instance of the OakLeaf Systems Windows Azure Table Test Harness running in Microsoft’s South Central US (San Antonio) data center:

The August 2010 downtime data is similar to that for preceding three months of Azure’s commercial operation, which began on January 4, 2010:

Year	Month	Uptime	Downtime	Outages	ResponseTime
2010	Jan	99.75%	1h 50m 02s	13	735ms
2010	Feb	99.99%	0h 04m 19s	1	734ms
2010	Mar	99.98%	0h 10m 00s	2	737ms
2010	Apr	99.71%	2h 05m 01s	6	782ms
2010	May	99.65%	2h 29m 59s	8	669ms
2010	Jun	99.65%	2h 29m 59s	8	660ms
2010	Jul	99.70%	2h 15m 01s	11	526ms
2010	Aug	99.96%	0h 19m 58s	3	521ms

Note that the OakLeaf application is not subject to Microsoft’s 99.9% availability Service Level Agreement (SLA), which requires two running instances.

One of the three outages appears to have been planned for fabric operating system maintenance. Lack of system upgrades during February and March would explain the higher uptime percentage.

It will be interesting to see if the 28.5% reduction in response time from the first quarter to August continues into autumn.

Note: September 2010 got off to a bad start with 2 hr 15 min of downtime on 9/2/2010. This outage did not appear in the status history as of 9/3/2010:

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