Preventative Maintenance and Patching Schedules
California Department of Technology (CDT) is committed to ensuring that all major components of its infrastructure are upgraded, patched and at recommended levels to meet our performance, reliability, availability and security objectives.
The scheduled maintenance windows allow CDT to increase our responsiveness to security threats, install timely upgrades to both server and networking hardware and software, and to implement critical infrastructure projects to proactively safeguard our customers. CDT coordinates all changes with the customers who will be impacted by work performed during these windows.
The Preventative Maintenance Schedule can be sorted by Day (Start or End columns) and by Resource. Please note that the Start and End times indicate the window within which maintenance will be performed; not necessarily the actual beginning and ending times.
Preventative Maintenance Schedule
Resource Reason/Use Start End
Admin Applications (CalTABS - PeopleSoft) System Maintenance Wednesdays - 1700 Wednesdays - 2300
Advanced Interactive Servers (AIX) Extended Preventative Maintenance
Recycle of Individual Servers split between the Second and Third Sunday of February, May, August, NovemberSundays - 0030 Sundays - 0730
AIX Servers (HACMP Clusters) High-Availability Cluster Failover Testing
Twice a year during regular PM windows (schedule determined with each customer)Sundays - 0030 Sundays - 0430
AIX Servers Recycle of Individual Servers split between the Second and Third Sunday of Month Sundays - 0030 Sundays - 0430
CalCloud Security Patches and Reboots Fridays - 1900 Saturdays - 0600
CAWeb Publishing System Maintenance Mondays and Wednesdays - 0900 Mondays and Wednesdays - 1100
Child Welfare Services (CWS) - SCT1 (IPL) System Maintenance/IPL
Second Saturday of Month
01/14/2023, 02/11/2023, 03/11/2023
04/08/2023, 05/13/2023, 06/10/2023
07/08/2023, 08/12/2023, 09/09/2023
10/14/2023, 11/11/2023, 12/09/2023Saturdays - 1500 Saturdays - 1700
Child Welfare Services (CWS) - SCT2 (IPL) System Maintenance/IPL
Second Saturday of January, March, April, June, July, September, October, December
01/14/2023, 03/11/2023, 04/08/2023
06/10/2023, 07/08/2023, 09/09/2023
10/14/2023, 12/09/2023Saturdays - 1300 Saturdays - 1500
Child Welfare Services (CWS) - SOC (IPL) System Maintenance/IPL
Third Thursday of January, March, April, June, July, September, October, December
01/19/2023, 03/16/2023, 04/20/2023
06/15/2023, 07/20/2023, 09/21/2023
10/19/2023, 12/21/2023Thursdays - 0200 Thursdays - 0400
Child Welfare Services (CWS) - SOC/SCT2 (IML) System Maintenance/IML
First Sunday of February, May, August, November
Included in the SY2 Box IML
02/05/2023, 05/07/2023, 08/06/2023
11/05/2023Sundays - 2000 Sundays - 2300
Child Welfare Services (CWS) - SOCP (IPL) System Maintenance/IPL
Fourth Sunday of February, March, May, June, August, September, November, December
02/26/2023, 03/26/2023, 05/28/2023
06/25/2023, 08/27/2023, 09/24/2023
11/26/2023, 12/24/2023Sundays - 0300 Sundays - 0500
Child Welfare Services (CWS) - SOCP/SCT1 (IML) System Maintenance/IML
Fourth Sunday of January, April, July, October
1/22/2023, 4/23/2023, 7/23/2023
10/22/2023Sundays - 0300 Sundays - 0500
COLA - CCCC/DDDD (IPL) System Maintenance/IPL
Third Sunday of each month
01/15/2023, 02/19/2023, 03/19/2023
04/16/2023, 05/21/2023, 06/18/2023
07/16/2023, 08/20/2023, 09/17/2023
10/15/2023, 11/19/2023, 12/17/2023Sundays - 0400 Sundays - 0800
Enterprise Linux Service - ELSGC1 Box (IML) System Maintenance/IML
First Sunday of March, June, and September Includes the following LPARs: ZLX3, ZLX4, ZLX9Sundays - 2300 Mondays - 0145
Enterprise Linux Service - ELSVV1 Box (IML) System Maintenance/IML
First Sunday of April, July, October
Includes the following LPARs: ZLX6, ZLX1DR, ZLX3DRSundays - 2300 Mondays - 0145
Linux Servers Security Patches and Reboots Sundays - 2000 Sundays - 2359
MS SQL Server System Maintenance Saturdays - 0700 Saturdays - 1200
Network - 2023 2023 Network Normal PMs
01/01/23, 01/08/23, 01/15/23, 01/22/23, 01/29/23
02/05/23, 02/12/23, 02/19/23, 02/26/23
03/05/23, 03/12/23, 03/19/23, 03/26/23
04/02/23, 04/09/23, 04/16/23, 04/23/23, 04/30/23
05/07/23, 05/14/23, 05/21/23, 05/28/23
06/04/23, 06/11/23, 06/18/23, 06/25/23
07/02/23, 07/09/23, 07/16/23, 07/23/23, 07/30/23
08/06/23, 08/13/23, 08/20/23, 08/27/23
09/03/23, 09/10/23, 09/17/23, 09/24/23
10/01/23, 10/08/23, 10/15/23, 10/22/23, 10/29/23
11/05/23, 11/12/23, 11/19/23, 11/26/23
12/03/23, 12/10/23, 12/17/23, 12/24/23Sundays - 0400 Sundays - 0700
Network - 2023 2023 Super Sundays
05/14/2023
10/15/2023Sundays - 0000 Sundays - 0700
Network - 2023 2023 Network Extended PMs
01/15/23
02/12/23
03/12/23
04/16/23
06/18/23
07/16/23
08/13/23
09/17/23
11/12/23
12/10/23
Sundays - 0200 Sundays - 0700
Network Network Maintenance
Non-disruptive and coordinated single customer changes
01/04/23, 01/11/23, 01/18/23, 01/25/23
02/01/23, 02/08/23, 02/15/23, 02/22/23
03/01/23, 03/08/23, 03/15/23, 03/22/23, 03/29/23
04/05/23, 04/12/23, 04/19/23, 04/26/23
05/03/23, 05/10/23, 05/17/23, 05/24/23, 05/31/23
06/07/23, 06/14/23, 06/21/23, 06/28/23
07/05/23, 07/12/23, 07/19/23, 07/26/23
08/02/23, 08/09/23, 08/16/23, 08/23/23, 08/30/23
09/06/23, 09/13/23, 09/20/23, 09/27/23
10/04/23, 10/11/23, 10/18/23, 10/25/23
11/01/23, 11/08/23, 11/15/23, 11/22/23, 11/29/23
12/06/23, 12/13/23, 12/20/23, 12/27/23
Wednesdays - 0000 Wednesdays - 0600
Network 2023 Network Patching Window
01/05/23, 01/12/23, 01/19/23 ,01/26/23
02/02/23, 02/09/23, 02/16/23, 02/23/23
03/02/23, 03/09/23, 03/16/23, 03/23/23, 03/30/23
04/06/23, 04/13/23, 04/20/23, 04/27/23
05/04/23, 05/11/23, 05/18/23, 05/25/23
06/01/23, 06/08/23, 06/15/23, 06/22/23, 06/29/23
07/06/23, 07/13/23, 07/20/23, 07/27/23
08/03/23, 08/10/23, 08/17/23, 08/24/23, 08/31/23
09/07/23, 09/14/23, 09/21/23, 09/28/23
10/05/23, 10/12/23, 10/19/23, 10/26/23
11/02/23, 11/09/23, 11/16/23, 11/23/23, 11/30/23
12/07/23, 12/14/23, 12/21/23, 12/28/23
Thursdays - 2000 Thursdays - 2400
OET Applications - CAMS, COLD/CSTD, SharePoint and BPAS Web Applications System Maintenance Wednesdays - 1700 Wednesdays - 2300
Open Systems Backup/Restore Backup/Restore Tuesdays - 1200 Tuesdays - 1400
Open Systems Storage System Maintenance
Firmware update/patches to SAN switches, storage arrays, and appliances (non-disruptive changes)Sundays - 0800 Sundays - 1700
S1S1 (IML) System Maintenance/IML
Monday after the second Sunday of February, May, August, November
02/13/2023, 05/15/2023, 08/14/2023
11/13/2023Mondays - 0001 Mondays - 0200
S1S1/S2S2 (IPL)
Shared Mainframe SystemSystem Maintenance/IPL
Monday after the second and fourth Sunday of each month
01/09/2023, 01/23/2023, 02/13/2023
02/27/2023, 03/13/2023, 03/27/2023
04/10/2023, 04/24/2023, 05/15/2023
05/29/2023, 06/12/2023, 06/26/2023
07/10/2023, 07/24/2023, 08/14/2023
08/28/2023, 09/11/2023, 09/25/2023
10/09/2023, 10/23/2023, 11/13/2023
11/27/2023, 12/11/2023, 12/25/2023Mondays - 0001 Mondays - 0200
S2S2 (IML) System Maintenance/IML
Monday after the second Sunday of March, June, September, December
03/13/2023, 06/12/2023, 09/11/2023
12/11/2023Mondays - 0001 Mondays - 0200
Secure Automated File Exchange (SAFE) System Maintenance
01/21/2023, 02/18/2023, 03/18/2023,
04/22/2023, 05/20/2023, 06/24/2023,
07/22/2023, 08/19/2023, 09/23/2023,
10/21/2023, 11/18/2023, 12/16/2023Saturdays - 2000 Sundays - 0200
ServiceNow System Maintenance
(Non-disruptive changes)Thursdays - 1900 Thursdays - 2100
ServiceNow System Maintenance
(Disruptive changes)Thursdays - 2200 Thursdays - 2359
SMTP Relay System Maintenance Fridays - 1900 Saturdays - 0200
Solaris Servers Security Patches and Reboots Sundays - 2000 Sundays - 2359
SY2/SY7 (IPL) Duplex System Maintenance/IPL
First and Third Sunday* of each month
(24/7 backup system)
*Except Sundays when SY2 box is scheduled for IML (02/05, 05/07, 08/06, 11/05)
01/01/2023, 01/15/2023, 02/19/2023
03/05/2023, 03/19/2023, 04/02/2023
04/16/2023, 05/21/2023, 06/04/2023
06/18/2023, 07/02/2023, 07/16/2023
08/06/2023, 08/20/2023
09/03/2013, 09/17/2023
10/01/2023, 10/15/2023, 11/05/2023
11/19/2023, 12/03/2023, 12/17/2023Sundays - 2000 Sundays - 2200
SY2 Box (IML) System Maintenance/IML
First Sunday of February, May, August, November
Includes the following LPARs: SY2, SY3, SY6, SY8P, SOC, and SCT2
02/05/2023, 05/07/2023
08/06/2023, 11/05/2023Sundays - 2000 Sundays - 2300
SY3 (SCO) (IPL) IPL
Weekly on Sundays*
*Except Sundays when SY2 box is scheduled for IML (02/05, 05/07, 08/06, and 11/05)
01/01/2023, 01/08/2023, 01/15/2023
01/22/2023, 01/29/2023, 02/12/2023
02/19/2023, 02/26/2023, 03/05/2023
03/12/2023, 03/19/2023, 03/26/2023
04/02/2023, 04/09/2023, 04/16/2023
04/23/2023, 04/30/2023, 05/14/2023
05/21/2023, 05/28/2023, 06/04/2023
06/11/2023, 06/18/2023, 06/25/2023
07/02/2023, 07/09/2023, 07/16/2023
07/23/2023, 07/30/2023, 08/13/2023
08/20/2023, 08/27/2023, 09/03/2023
09/10/2023, 09/17/2023, 09/24/2023
10/01/2023, 10/08/2023, 10/15/2023
10/22/2023, 10/29/2023, 11/12/2023
11/19/2023, 11/26/2023, 12/03/2023
12/10/2023, 12/17/2023, 12/24/2023
12/31/2023
Sundays - 2030 Sundays - 2130
SY4/SY5/SY6 (IPL) System Maintenance/IPL
First and Third Sunday* of each month
*Except Sundays when SY4 or SY5 are scheduled for IML (01/01 (SY4), 03/05 (SY5), 04/02 (SY4), 06/04 (SY5), 07/02 (SY4), 09/03 (SY5), 10/01 (SY4))
01/15/2023, 02/05/2023, 02/19/2023
03/19/2023, 04/16/2023, 05/07/2023
05/21/2023, 06/18/2023, 07/16/2023
08/06/2023, 08/20/2023, 09/17/2023
10/15/2023, 11/05/2023, 11/19/2023
12/03/2023, 12/17/2023Sundays - 2300 Mondays - 0145
SY4 Box (IML) System Maintenance/IML
First Sunday of January, April, July, October
Includes the following LPARs: SY9, ZLX1 and ZLX2
01/01/2023, 04/02/2023, 07/02/2023, 10/01/2023Sundays - 2300 Mondays - 0145
SY5 Box (IML) System Maintenance/IML
First Sunday of March, June, and September
Includes the following LPAR: SY7
03/05/2023, 06/04/2023, 09/03/2023Sundays - 2300 Mondays - 0145
SY8/SY8B CMC Roll to Backup (when needed) Sundays - 0300 Sundays - 0400
SY8H (IPL) CMCH IPL
First Sunday* of each month
*Except Sundays when SY5 box is scheduled for IML (SY5 - (03/05/2023, 06/04/2023, 09/03/2023))
01/01/2023, 02/05/2023, 04/02/2023
05/07/2023, 07/02/2023, 08/06/2023
10/01/2023, 11/05/2023, 12/03/2023Sundays - 2300 Mondays - 0145
SY8P CMC IPL
First Sunday* of each month
*Except Sundays of each month when SY2 box is scheduled for IML
(SY2 scheduled for (02/05/2023, 05/07/2023, 08/06/2023, 11/05/2023))
01/01/2023, 03/05/2023, 04/02/2023
06/04/2023, 07/02/2023, 09/03/2023
10/01/2023, 12/03/2023Sundays - 2100 Sundays - 2200
Server Based Computing Services (Formerly Virtual Desktop) System Maintenance
Every Saturday*
*OS Security patching completed the last Saturday of each month
01/28/2023, 02/25/2023, 03/25/2023
04/29/2023, 05/27/2023, 06/24/2023
07/29/2023, 08/26/2023, 09/23/2023
10/28/2023, 11/25/2023, 12/30/2023
Saturday - 0600
Saturday - 1000
Windows Resources System Maintenance
01/13/2023, 01/20/2023
02/17/2023, 02/24/2023
03/17/2023, 03/24/2023
04/14/2023, 04/21/2023
05/12/2023, 05/19/2023
06/16/2023, 06/23/2023
07/14/2023, 07/21/2023
08/11/2023, 08/18/2023
09/15/2023, 09/22/2023
10/13/2023, 10/20/2023
11/17/2023, 12/01/2023
12/15/2023, 12/22/2023
Fridays - 1800 Saturdays - 0100
www.ca.gov System Maintenance Fridays - 0600 Fridays - 0800
ZLX1 & ZLX4 First Sunday of each month Sundays - 2030 Sundays - 2130
ZLX2 & ZLX3 Second Sunday of each month at 20:30-21:30
*except Sundays when SY4 box is scheduled for IMLSundays - 2030 Sundays - 2130