At Zendesk we are committed to providing the highest level of service and operational transparency. As part of that effort, we record on this page every time our system is unavailable. This record includes both scheduled maintenance which we post to our announcements forum and unscheduled downtime.
We calculate our monthly uptime based on only unscheduled downtime. The uptime figures since May 2010 are listed below.
During a downtime, our maintenance page will appear and the image to the right will change from green to orange. We tweet updates in real-time from our Twitter account @zendeskops during maintenance, which also appear on this page.
Monthly Uptime in 2011
June
May
Apr
Mar
Feb
Jan
99.955%
99.514%
100%
100%
99.963%
99.933%
Monthly Uptime in 2010
Dec
Nov
Oct
Sept
Aug
July
June
May
99.889%
99.898%
100%
99.921%
99.655%
99.982%
99.969%
99.915%
Downtime History
Start Time
End Time
Duration
Scheduled
Sat Jun 04 10:00 AM
Sat Jun 04 11:20 AM
80m
Yes
Database re-organization
Fri May 27 5:16 AM
Fri May 27 5:27 AM
11m
No
Hardware failure on primary database
Mon May 23 2:50 AM
Mon May 23 4:05 AM
1h 15m
No
MySQL upgrade caused serious performance degradation
Mon May 23 1:37 AM
Mon May 23 1:57 AM
20m
No
MySQL bug caused crash in primary database
Fri May 20 5:08 AM
Fri May 20 5:51 AM
43m
No
MySQL bug caused crash in primary database
Thurs May 19 10:43 AM
Thurs May 19 11:51 AM
1h 8m
No
MySQL bug caused crash in primary database
Sat Apr 2 10:00 AM
Sat Apr 2 10:49 AM
49m
Yes
Scheduled outage. Database and network upgrades
Sat Mar 12 10:00 AM
Sat Mar 12 10:32 AM
32m
Yes
Scheduled maintenance on databases and network equipment
Fri Feb 4 12:31 PM
Fri Feb 4 12:39 PM
8m
No
Slave database lockup
Wed Feb 2 12:12 PM
Wed Feb 2 12:19 PM
7m
No
File server outage.
Sat Jan 22 10:20 PM
Sat Jan 22 10:50 PM
30m
No
Backbone network outage at our hosting provider.
Sat Jan 22 10:00 AM
Sat Jan 22 10:29 AM
29m
Yes
Scheduled maintenance on primary database.
Tue Dec 21 10:57 AM
Tue Dec 21 11:05 AM
8m
No
Poorly tuned search service caused requests to block
Wed Dec 8 7:33 AM
Wed Dec 8 8:13 AM
40m
No
Excessive load caused by over-agressive API polling by a large customer.
Tue Nov 30 10:05 PM
Tue Nov 30 10:13 PM
8m
No
Site become blocked on slave database
Sun Nov 14 10:14 AM
Sun Nov 14 10:50 AM
36m
No
Primary load balancer failed and failover to secondary unsuccessful.
Sat Nov 6 10:00 AM
Sat Nov 6 10:21 AM
21m
Yes
Software upgrade on primary database
Fri Sep 24 11:35 PM
Fri Sep 24 11:38 PM
3m
No
Unexpected primary database restart during an automated software upgrade
Thu Sep 23 4:33 PM
Thu Sep 23 4:50 PM
17m
No
Deployment of an incorrect network configuration file during a software update
Sat Sep 18 10:00 AM
Sat Sep 18 11:18 AM
1h 18m
Yes
Scheduled migration to a new datacenter
Mon Sep 13 8:32 AM
Mon Sep 13 8:43 AM
11m
No
Excessive load on servers caused by slow forum API requests
Sat Aug 21 9:47 PM
Sun Aug 22 12:17 AM
2h 30m
No
Severed fiber optic cable disrupted access to datacenter
Thu Aug 12 4:29 PM
Thu Aug 12 4:33 PM
4m
No
Excessive load on servers caused by repeated RSS API requests
Mon Jul 12 4:15 PM
Mon Jul 12 4:23 PM
7m 59s
No
Bug in software upgrade caused homepage to be inaccessible
Sat Jul 10 9:59 AM
Sat Jul 10 10:22 AM
23m
Yes
Scheduled software upgrade of primary database
Mon Jun 28 6:14 AM
Mon Jun 28 6:20 AM
6m
No
Load balancer misconfiguration
Mon Jun 21 8:49 AM
Mon Jun 21 8:51 AM
2m
No
Degraded network connectivity to datacenter
Sat Jun 5 10:00 AM
Sat Jun 5 10:10 AM
10m 4s
Yes
Scheduled upgrade to database schema
Mon May 24 11:19 PM
Mon May 24 11:48 PM
29m
No
Full system restart to fix lockup of shared filesystem
