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/Use/DatesStartEnd
Admin Applications (CalTABS - PeopleSoft)System MaintenanceWednesdays - 1700Wednesdays - 2300
AIX Servers (including HACMP)All Preventative Maintenance is coordinated directly with our customers.
CalCloudSecurity Patches and RebootsFridays - 1900 Saturdays - 0600
CAWeb PublishingSystem MaintenanceMondays - 0900Mondays - 1100
CAWeb PublishingSystem MaintenanceWednesdays - 0900Wednesdays - 1100
Child Welfare Services (CWS) - SCT1 (IPL)
System Maintenance/IPL for zSystems
Second Saturday of Month

01/13/24, 02/10/24, 03/09/24, 04/13/24
05/11/24, 06/08/24, 07/13/24, 08/10/24
09/14/24, 10/12/24, 11/09/24, 12/14/24
Saturdays - 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

01/13/24, 03/09/24, 04/13/24, 06/08/24
07/13/24, 09/14/24, 10/12/24, 12/14/24
Saturdays - 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

01/18/24, 03/21/24, 04/18/24, 06/20/24
07/18/24, 09/19/24, 10/17/24, 12/19/24
Thursdays - 0200Thursdays - 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

02/04/24, 05/05/24, 08/04/24, 11/03/24
Sundays - 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

02/25/24, 03/24/24, 05/26/24, 06/23/24
08/25/24, 09/22/24, 11/24/24, 12/22/24
Sundays - 0300 Sundays - 0500
Child Welfare Services (CWS) - SOCP/SCT1 (IML) System Maintenance/IML for zSystems
Fourth Sunday of January, April, July, October

01/28/24, 04/28/24, 07/28/24, 10/27/24
Sundays - 0300 Sundays - 0500
COLA - CCCC/DDDD (IPL) System Maintenance/IPL for zSystems
Third Sunday of each month

01/21/24, 02/18/24, 03/17/24, 04/21/24
05/19/24, 06/16/24, 07/21/24, 08/18/24
09/15/24, 10/20/24, 11/17/24, 12/15/24
Sundays - 0400Sundays - 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, ZLX9
Sundays - 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, ZLX3DR
Sundays - 2300 Mondays - 0145
Linux ServersAll Preventative Maintenance is coordinated directly with our customers.
MS SQL ServerSystem MaintenanceSaturdays - 0700 Saturdays - 1200
NetworkNetwork Normal PMs

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, 12/29/24
Sundays - 0400Sundays - 0700
NetworkSuper Sundays

05/19/2024,10/13/2024
Sundays - 0000Sundays - 0700
NetworkNetwork Extended PMs

01/21/24, 02/25/24, 03/17/24, 04/14/24
06/23/24, 07/14/24, 08/11/24, 09/15/24
11/17/24,12/15/24
Sundays - 0200Sundays - 0700
NetworkNetwork Maintenance
Non-disruptive and coordinated single customer changes

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, 12/18/24
Wednesdays - 0000Wednesdays - 0600
NetworkNetwork Patching Window

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, 12/19/24
Thursdays - 2000Thursdays - 2400
OET Applications - CAMS, COLD/CSTD, SharePoint and BPAS Web ApplicationsSystem MaintenanceWednesdays - 1700Wednesdays - 2300
Open Systems Backup/RestoreBackup/Restore for AIX, Linux, Solaris, and Windows StorageTuesdays - 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 for zSystems
Monday after the second Sunday of February, May, August, November

02/12/24, 05/13/24, 08/12/24, 11/11/24
Mondays - 0001Mondays - 0200
S1S1/S2S2 (IPL)
Shared Mainframe System
System Maintenance/IPL for zSystems
Monday after the second and fourth Sunday of each month

01/15/24, 01/29/24, 02/12/24, 02/26/24
03/11/24, 03/25/24, 04/15/24, 04/29/24
05/13/24, 05/27/24, 06/10/24, 06/24/24

07/15/24, 07/29/24, 08/12/24, 08/26/24
09/09/24, 09/23/24, 10/14/24, 10/28/24
11/11/24, 11/25/24, 12/09/24, 12/23/24
Mondays - 0001Mondays - 0200
S2S2 (IML) System Maintenance/IML for zSystems
Monday after the second Sunday of March, June, September, December

03/11/24, 06/10/24, 09/09/24, 12/09/24
Mondays - 0001Mondays - 0200
Secure Automated File Exchange (SAFE)System Maintenance

01/20/24, 02/24/24, 03/30/24, 04/20/24
05/18/24, 06/22/24, 07/20/24, 08/24/24
09/21/24, 10/19/24, 11/23/24, 12/14/24
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 ServersAll 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 (02/04/24, 05/05/24, 08/04/24, 11/03/24)

01/07/24, 01/21/24, 02/18/24, 03/03/24
03/17/24, 04/07/24, 04/21/24, 05/19/24
06/02/24, 06/16/24, 07/07/24, 07/21/24
08/18/24, 09/01/24, 09/15/24, 10/06/24
10/20/24, 11/17/24, 12/01/24, 12/15/24
Sundays - 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

02/04/24, 05/05/24, 08/04/24, 11/03/24
Sundays - 2000 Sundays - 2300
SY3 (SCO) (IPL) IPL for zSystems
Weekly on Sundays*
*Except Sundays when SY2 box is scheduled for IML (02/04/24, 05/05/24, 08/04/24, and 11/03/24)

01/07/24, 01/14/24, 01/21/24, 01/28/24
02/11/24, 02/18/24, 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

05/12/24, 05/19/24, 05/26/24, 06/02/24
06/09/24, 06/16/24, 06/23/24, 06/30/24
07/07/24, 07/14/24, 07/21/24, 07/28/24
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
11/10/24, 11/17/24, 11/24/24, 12/01/24
12/08/24, 12/15/24, 12/22/24, 12/29/24
Sundays - 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 (01/07/24 (SY4), 03/03/24 (SY5), 04/07/24 (SY4), 06/02/24 (SY5), 07/07/24 (SY4), 09/01/24 (SY5), 10/06/24 (SY4))

01/21/24, 02/04/24, 02/18/24, 03/17/24
04/21/24, 05/05/24, 05/19/24, 06/16/24
07/21/24, 08/04/21, 08/18/24, 09/15/24
10/20/24, 11/03/24, 11/17/24, 12/01/24
12/15/24
Sundays - 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 ZLX2

01/07/24, 04/07/24, 07/07/24, 10/06/24
Sundays - 2300 Mondays - 0145
SY5 Box (IML) System Maintenance/IML for zSystems
First Sunday of March, June, and September
Includes the following LPAR: SY7

03/03/24, 06/02/24, 09/01/24
Sundays - 2300 Mondays - 0145
SY8/SY8BCMC Roll to Backup for zSystems (when needed)

01/07/24, 03/03/24, 04/07/24, 06/02/24
07/07/24, 09/01/24, 10/06/24, 12/01/24
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))

01/07/24, 02/04/24, 04/07/24, 05/05/24
07/07/24, 08/04/24, 10/06/24, 11/03/24
12/01/24
Sundays - 2300Mondays - 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))

01/07/24, 03/03/24, 04/07/24, 06/02/24
07/07/24, 09/01/24, 10/06/24, 12/01/24
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

01/27/24, 02/24/24, 03/23/24, 04/27/24
05/25/24, 06/29/24, 07/27/24, 08/31/24
09/28/24, 10/26/24, 11/30/24, 12/28/24
Saturday - 0600
Saturday - 1000
Windows ResourcesSystem Maintenance

01/12/24, 01/19/24, 02/16/24, 02/23/24
03/15/24, 03/22/24, 04/12/24, 04/19/24
05/17/24, 05/24/24, 06/14/24, 06/21/24
07/12/24, 07/19/24, 08/16/24, 08/23/24
09/13/14, 09/20/24, 10/11/24, 10/18/24
11/15/24, 11/22/24, 12/13/24, 12/20/24
Fridays - 1800Saturdays - 0100
www.ca.govSystem MaintenanceFridays - 0600 Fridays - 0800
ZLX1 & ZLX4 zSystems
First Sunday of each month
Sundays - 2030 Sundays - 2130
ZLX2 & ZLX3 zSystems
Second Sunday of each month at 20:30-21:30
*except Sundays when SY4 box is scheduled for IML
Sundays - 2030 Sundays - 2130