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/Dates Start End
Admin Applications (CalTABS - PeopleSoft) System Maintenance Wednesdays - 1700 Wednesdays - 2300
AIX Servers (including HACMP) All Preventative Maintenance is coordinated directly with our customers.
CalCloud Security Patches and Reboots Fridays - 1900 Saturdays - 0600
CAWeb Publishing System Maintenance Mondays - 0900 Mondays - 1100
CAWeb Publishing System Maintenance Wednesdays - 0900 Wednesdays - 1100
Child Welfare Services (CWS) - SCT1 (IPL)
System Maintenance/IPL for zSystems
Second Saturday of Month
11/11/2023
12/09/2023Saturdays - 1500 Saturdays - 1700
Child Welfare Services (CWS) - SCT2 (IPL) System Maintenance/IPL for zSystems
Second Saturday of January, March, April, June, July, September, October, December
12/09/2023Saturdays - 1300 Saturdays - 1500
Child Welfare Services (CWS) - SOC (IPL) System Maintenance/IPL for zSystems
Third Thursday of January, March, April, June, July, September, October, December
12/21/2023Thursdays - 0200 Thursdays - 0400
Child Welfare Services (CWS) - SOC/SCT2 (IML) System Maintenance/IML for zSystems
First Sunday of February, May, August, November
Included in the SY2 Box IML
11/05/2023Sundays - 2000 Sundays - 2300
Child Welfare Services (CWS) - SOCP (IPL) System Maintenance/IPL for zSystems
Fourth Sunday of February, March, May, June, August, September, November, December
11/26/2023
12/24/2023Sundays - 0300 Sundays - 0500
Child Welfare Services (CWS) - SOCP/SCT1 (IML) System Maintenance/IML for zSystems
Fourth Sunday of January, April, July, OctoberSundays - 0300 Sundays - 0500
COLA - CCCC/DDDD (IPL) System Maintenance/IPL for zSystems
Third Sunday of each month
11/19/2023
12/17/2023Sundays - 0400 Sundays - 0800
Enterprise Linux Service - ELSGC1 Box (IML) System Maintenance/IML for zSystems
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 for zSystems
First Sunday of April, July, October
Includes the following LPARs: ZLX6, ZLX1DR, ZLX3DRSundays - 2300 Mondays - 0145
Linux Servers All Preventative Maintenance is coordinated directly with our customers.
MS SQL Server System Maintenance Saturdays - 0700 Saturdays - 1200
Network Network Normal PMs
11/05/23, 11/12/23, 11/19/23, 11/26/23
12/03/23, 12/10/23, 12/17/23, 12/24/23
01/07/24, 01/14/24, 01/21/24, 01/28/24
02/04/24, 02/11/24, 02/25/24
03/03/24, 03/10/24, 03/17/24, 03/24/24, 03/31/24
04/07/24, 04/14/24, 04/21/24, 04/28/24
05/05/24, 05/12/24, 05/19/24, 05/26/24
06/02/24, 06/09/24, 06/23/24, 06/30/24
07/07/24, 07/14/24, 07/21/24, 07/28/24
08/04/24, 08/11/24, 08/18/24, 08/25/24
09/01/24, 09/08/24, 09/15/24, 09/22/24, 09/29/24
10/06/24, 10/13/24, 10/20/24, 10/27/24
11/03/24, 11/10/24, 11/17/24, 11/24/24
12/01/24, 12/08/24, 12/15/24, 12/22/24, 12/29/24Sundays - 0400 Sundays - 0700
Network Super Sundays
05/19/2024
10/15/2024Sundays - 0000 Sundays - 0700
Network Network Extended PMs
11/12/23
12/10/23
01/21/24
02/25/24
03/17/24
04/14/24
06/23/24
07/14/24
08/11/24
09/15/24
11/17/24
12/15/24Sundays - 0200 Sundays - 0700
Network Network Maintenance
Non-disruptive and coordinated single customer changes
11/08/23, 11/15/23, 11/22/23, 11/29/23
12/06/23, 12/13/23, 12/20/23, 12/27/23
01/03/24, 01/10/24, 01/17/24, 01/24/24, 01/31/24
02/07/24, 02/14/24, 02/21/24, 02/28/24
03/06/24, 03/13/24, 03/20/24, 03/27/24
04/03/24, 04/10/24, 04/17/24, 04/24/24
05/01/24, 05/08/24, 05/15/24, 05/22/24, 05/29/24
06/05/24, 06/12/24, 06/19/24, 06/26/24
07/03/24, 07/10/24, 07/17/24, 07/24/24, 07/31/24
08/07/24, 08/14/24, 08/21/24, 08/28/24
09/04/24, 09/11/24, 09/18/24, 09/25/24
10/02/24, 10/09/24, 10/16/24, 10/23/24, 10/30/24
11/06/24, 11/13/24, 11/20/24, 11/27/24
12/04/24, 12/11/24, 12/18/24Wednesdays - 0000 Wednesdays - 0600
Network Network Patching Window
11/09/23, 11/16/23, 11/23/23, 11/30/23
12/07/23, 12/14/23, 12/21/23, 12/28/23
01/04/24, 01/11/24, 01/18/24 ,01/25/24
02/01/24, 02/08/24, 02/15/24, 02/22/24, 02/29/24
03/07/24, 03/14/24, 03/21/24, 03/28/24
04/04/24, 04/11/24, 04/18/24, 04/25/24
05/02/24, 05/09/24, 05/16/24, 05/23/24, 05/30/24
06/06/24, 06/13/24, 06/20/24, 06/27/24
07/11/24, 07/18/24, 07/25/24
08/01/24, 08/08/24, 08/15/24, 08/22/24, 08/29/24
09/05/24, 09/12/24, 09/19/24, 09/26/24
10/03/24, 10/10/24, 10/17/24, 10/24/24, 10/31/24
11/07/24, 11/14/24, 11/21/24, 11/28/24
12/05/24, 12/12/24, 12/19/24Thursdays - 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 for AIX, Linux, Solaris, and Windows Storage 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 for zSystems
Monday after the second Sunday of February, May, August, November
11/13/2023Mondays - 0001 Mondays - 0200
S1S1/S2S2 (IPL)
Shared Mainframe System System Maintenance/IPL for zSystems
Monday after the second and fourth Sunday of each month
11/13/2023, 11/27/2023
12/11/2023, 12/25/2023Mondays - 0001 Mondays - 0200
S2S2 (IML) System Maintenance/IML for zSystems
Monday after the second Sunday of March, June, September, December
12/11/2023Mondays - 0001 Mondays - 0200
Secure Automated File Exchange (SAFE) System Maintenance
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 All Preventative Maintenance is coordinated directly with our customers.
SY2/SY7 (IPL) Duplex System Maintenance/IPL for zSystems
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)
11/05/2023, 11/19/2023
12/03/2023, 12/17/2023Sundays - 2000 Sundays - 2200
SY2 Box (IML) System Maintenance/IML for zSystems
First Sunday of February, May, August, November
Includes the following LPARs: SY2, SY3, SY6, SY8P, SOC, and SCT2
11/05/2023Sundays - 2000 Sundays - 2300
SY3 (SCO) (IPL) IPL for zSystems
Weekly on Sundays*
*Except Sundays when SY2 box is scheduled for IML (02/05, 05/07, 08/06, and 11/05)
11/12/2023, 11/19/2023, 11/26/2023
12/03/2023, 12/10/2023, 12/17/2023, 12/24/2023, 12/31/2023Sundays - 2030 Sundays - 2130
SY4/SY5/SY6 (IPL) System Maintenance/IPL for zSystems
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))
11/05/2023,11/19/2023
12/03/2023,12/17/2023Sundays - 2300 Mondays - 0145
SY4 Box (IML) System Maintenance/IML for zSystems
First Sunday of January, April, July, October
Includes the following LPARs: SY9, ZLX1 and ZLX2Sundays - 2300 Mondays - 0145
SY5 Box (IML) System Maintenance/IML for zSystems
First Sunday of March, June, and September
Includes the following LPAR: SY7Sundays - 2300 Mondays - 0145
SY8/SY8B CMC Roll to Backup for zSystems (when needed) Sundays - 0300 Sundays - 0400
SY8H (IPL) CMCH IPL for zSystems
First Sunday* of each month
*Except Sundays when SY5 box is scheduled for IML (SY5 - (03/05/2023, 06/04/2023, 09/03/2023))
11/05/2023
12/03/2023Sundays - 2300 Mondays - 0145
SY8P CMC IPL for zSystems
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))
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
11/25/2023
12/30/2023
Saturday - 0600
Saturday - 1000
Windows Resources System Maintenance
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 zSystems
First Sunday of each monthSundays - 2030 Sundays - 2130
ZLX2 & ZLX3 zSystems
Second Sunday of each month at 20:30-21:30
*except Sundays when SY4 box is scheduled for IMLSundays - 2030 Sundays - 2130