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Performance Metrics - 2011

Percentage of time that a request for a page is returned within three seconds from on campus (target: 99.9%)

Month %
Jan '11 100%
Feb '11 100%
Mar '11 99.99%
Apr '11 99.99%
May '11 99.95%
Jun '11 100%
Jul '11 99.99%
Aug '11 100%
Sep '11 100%
Oct '11 99.99%*
Nov '11 99.99%
Dec '11 99.98%**

* This drop was caused by a short period of downtime caused by a disk failure on a server at 4:40am, which the server then recovered from through hardware resiliency.

** This drop was caused by scheduled network maintenance from 6am to 6:10am on two mornings.

Availability off-campus, as measured by Pingdom.com (30 second timeout, from at least 2 out of 10 locations ) (no target set)

Month %
Jan '11 99.93%
Feb '11 99.99%
Mar '11 99.98%
Apr '11 100%
May '11 99.98%
Jun '11 100%
Jul '11 99.99%
Aug '11 100%
Sep '11 100%
Oct '11 99.98%
Nov '11 100%
Dec '11 99.93%

Percentage of time that a request for a websignon UserLookup request is returned within 5 seconds from within our datacenter* (target: 99.5%)

Month %
Jan '11 100%
Feb '11 99.94%
Mar '11 100%
Apr '11 100%
May '11 100%
Jun '11 100%
Jul '11 100%
Aug '11 100%
Sep '11 100%
Oct '11** 99.97*%
Nov '11 100%
Dec '11 100%

* This might seem contrived. But 5 seconds is the threshold at which other applications will time-out a request to websignon, and since the vast majority of WSOS-enabled apps live in our datacentres, that's where we should measure from.

** Downtime in October '11 caused by a resource capacity issue with unexpectedly large numbers of new students attempting to sign in, causing a 15 minute period of degraded service