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

ResourceReason/UseStartEnd
Admin Applications (CalTABS - PeopleSoft)System MaintenanceWednesdays - 1700Wednesdays - 2300
Advanced Interactive Servers (AIX)Extended Preventative Maintenance
Recycle of Individual Servers split between the Second and Third Sunday of February, May, August, November		Sundays - 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 ServersRecycle of Individual Servers split between the Second and Third Sunday of MonthSundays - 0030 Sundays - 0430
CalCloudSecurity Patches and RebootsFridays - 1900 Saturdays - 0600
CAWeb PublishingSystem MaintenanceMondays and Wednesdays - 0900Mondays 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, 12/09/2023		Saturdays - 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, 12/09/2023		Saturdays - 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, 12/21/2023		Thursdays - 0200Thursdays - 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
11/05/2023		Sundays - 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, 12/24/2023		Sundays - 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
10/22/2023		Sundays - 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, 12/17/2023		Sundays - 0400Sundays - 0800
Enterprise Linux Service - ELSGC1 Box (IML)System Maintenance/IML
First Sunday of March, June, and September Includes the following LPARs: ZLX3, ZLX4, ZLX9		Sundays - 2300 Mondays - 0145
Enterprise Linux Service - ELSVV1 Box (IML)System Maintenance/IML
First Sunday of April, July, October
Includes the following LPARs: ZLX6, ZLX1DR, ZLX3DR		Sundays - 2300 Mondays - 0145
Linux ServersSecurity Patches and RebootsSundays - 2000 Sundays - 2359
MS SQL ServerSystem MaintenanceSaturdays - 0700 Saturdays - 1200
Network - 20232023 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, 12/24/23		Sundays - 0400Sundays - 0700
Network - 20232023 Super Sundays
05/14/2023
10/15/2023		Sundays - 0000Sundays - 0700
Network - 20232023 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 - 0200Sundays - 0700
NetworkNetwork 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 - 0000Wednesdays - 0600
Network2023 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 - 2000Thursdays - 2400
OET Applications - CAMS, COLD/CSTD, SharePoint and BPAS Web ApplicationsSystem MaintenanceWednesdays - 1700Wednesdays - 2300
Open Systems Backup/RestoreBackup/RestoreTuesdays - 1200Tuesdays - 1400
Open Systems StorageSystem Maintenance
Firmware update/patches to SAN switches, storage arrays, and appliances (non-disruptive changes)		Sundays - 0800Sundays - 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
11/13/2023		Mondays - 0001Mondays - 0200
S1S1/S2S2 (IPL)
Shared Mainframe System		System 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, 12/25/2023		Mondays - 0001Mondays - 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
12/11/2023		Mondays - 0001Mondays - 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, 12/16/2023		Saturdays - 2000 Sundays - 0200
ServiceNowSystem Maintenance
(Non-disruptive changes)		Thursdays - 1900 Thursdays - 2100
ServiceNowSystem Maintenance
(Disruptive changes)		Thursdays - 2200 Thursdays - 2359
SMTP RelaySystem MaintenanceFridays - 1900Saturdays - 0200
Solaris ServersSecurity Patches and RebootsSundays - 2000 Sundays - 2359
SY2/SY7 (IPL) DuplexSystem 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, 12/17/2023		Sundays - 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, 11/05/2023		Sundays - 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, 12/17/2023		Sundays - 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, 10/01/2023		Sundays - 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, 09/03/2023		Sundays - 2300 Mondays - 0145
SY8/SY8BCMC 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, 12/03/2023		Sundays - 2300Mondays - 0145
SY8PCMC 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, 12/03/2023		Sundays - 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 ResourcesSystem 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 - 1800Saturdays - 0100
www.ca.govSystem MaintenanceFridays - 0600 Fridays - 0800
ZLX1 & ZLX4First Sunday of each monthSundays - 2030 Sundays - 2130
ZLX2 & ZLX3Second Sunday of each month at 20:30-21:30
*except Sundays when SY4 box is scheduled for IML		Sundays - 2030 Sundays - 2130