> For the complete documentation index, see [llms.txt](https://docs.cw.crisisworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cw.crisisworks.com/security-and-support/maintenance-and-support/maintenance-windows.md).

# Maintenance Windows

Datalink uses standard and predictable maintenance windows for all planned system upgrades.

## Standard Maintenance <a href="#standard-maintenance" id="standard-maintenance"></a>

Most sites will follow the standard maintenance window.

| **When**   | Monday evenings                                                                                                                                                                                                                                   |
| ---------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Time**   | 6:00 p.m. until 10:00 p.m. Melbourne, Australia ([convert timezone](https://www.google.com/search?q=timezone+melbourne))                                                                                                                          |
| **Impact** | <ul><li>The majority of our maintenance within the maintenance window is conducted with zero downtime.</li><li>Some maintenance may have a small amount of downtime, typically measured in a few minutes during the maintenance period.</li></ul> |

## Early Access Program <a href="#early-access-program" id="early-access-program"></a>

Our early access program provides a faster stream of upgraded software. Administrators can opt their site in out of this program by contacting our Service Desk, and our Service Desk may involve your site in the EAP if working with you to resolve a technical issue.

| **When**   | <p>This varies according to the maintenance.</p><ul><li>Minor upgrades where no outage is expected may be conducted at any time</li><li>Major upgrades where an outage is expected will be Wednesday evening</li></ul>                                                                                                                           |
| ---------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| **Time**   | Wednesday evening 6:00 p.m. until 10:00 p.m. Melbourne, Australia ([convert timezone](https://www.google.com/search?q=timezone+melbourne))                                                                                                                                                                                                       |
| **Impact** | <ul><li>All upgrades conducted during business hours will have no downtime.</li><li>The majority of our maintenance within the maintenance window is conducted with zero downtime.</li><li>Some maintenance during the maintenance window may have a small amount of downtime, typically measured in a few minutes during this period.</li></ul> |

## Holdback Arrangement <a href="#holdback-arrangement" id="holdback-arrangement"></a>

During extreme high pressure events, some customers wish to remain on a previous version rather than be upgraded, in which case they can request to be put onto our holdback arrangement.

Under this arrangement, only critical maintenance is carried out, and major releases are withheld for a short period of time. This is useful if a major version is planned for release at a time when a customer is involved in a high-pressure event.

* The holdback arrangement is designed to defer major upgrades, not all maintenance.
* The holdback arrangement is an exceptional, temporary arrangement that will last only a few days.
* Datalink will work with you to seek a better time to upgrade your site out of the normal maintenance windows.

To request your site be placed onto the holdback arrangement, please email our Service Desk.


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