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Merge pull request #116219 from shants123/patch-15
Some changes to reflect that Maintenance Control is GA
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articles/virtual-machines/maintenance-and-updates.md

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ms.service: virtual-machines
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ms.workload: infrastructure-services
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ms.topic: article
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ms.date: 11/18/2019
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ms.date: 05/22/2020
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ms.author: shants
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#pmcontact:shants
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---
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Updates rarely affect the hosted VMs. When updates do have an effect, Azure chooses the least impactful method for updates:
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- If the update doesn't require a reboot, the VM is paused while the host is updated, or the VM is live-migrated to an already updated host.
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- If maintenance requires a reboot, you're notified of the planned maintenance. Azure also provides a time window in which you can start the maintenance yourself, at a time that works for you. The self-maintenance window is typically 30 days unless the maintenance is urgent. Azure is investing in technologies to reduce the number of cases in which planned platform maintenance requires the VMs to be rebooted. For instructions on managing planned maintenance, see Handling planned maintenance notifications using the Azure [CLI](maintenance-notifications-cli.md), [PowerShell](maintenance-notifications-powershell.md) or [portal](maintenance-notifications-portal.md).
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- If maintenance requires a reboot, you're notified of the planned maintenance. Azure also provides a time window in which you can start the maintenance yourself, at a time that works for you. The self-maintenance window is typically 35 days unless the maintenance is urgent. Azure is investing in technologies to reduce the number of cases in which planned platform maintenance requires the VMs to be rebooted. For instructions on managing planned maintenance, see Handling planned maintenance notifications using the Azure [CLI](maintenance-notifications-cli.md), [PowerShell](maintenance-notifications-powershell.md) or [portal](maintenance-notifications-portal.md).
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This page describes how Azure performs both types of maintenance. For more information about unplanned events (outages), see [Manage the availability of VMs for Windows](./windows/manage-availability.md) or the corresponding article for [Linux](./linux/manage-availability.md).
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Memory-preserving maintenance works for more than 90 percent of Azure VMs. It doesn't work for G, M, N, and H series. Azure increasingly uses live-migration technologies and improves memory-preserving maintenance mechanisms to reduce the pause durations.
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These maintenance operations that don't require a reboot are applied one fault domain at a time. They stop if they receive any warning health signals.
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These maintenance operations that don't require a reboot are applied one fault domain at a time. They stop if they receive any warning health signals from platform monitoring tools.
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These types of updates can affect some applications. When the VM is live-migrated to a different host, some sensitive workloads might show a slight performance degradation in the few minutes leading up to the VM pause. To prepare for VM maintenance and reduce impact during Azure maintenance, try [using Scheduled Events for Windows](./windows/scheduled-events.md) or [Linux](./linux/scheduled-events.md) for such applications.
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There is also a feature, maintenance control, in public preview that can help manage maintenance that doesn't require a reboot. You must be using either [Azure Dedicated Hosts](./linux/dedicated-hosts.md) or an [isolated VM](../security/fundamentals/isolation-choices.md). Maintenance control gives you the option to skip platform updates and apply the updates at your choice of time within a 35-day rolling window. For more information, see [Control updates with Maintenance Control and the Azure CLI](maintenance-control-cli.md).
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For greater control on all maintenance activities including zero-impact and rebootless updates, you can use Maintenance Control feature. You must be using either [Azure Dedicated Hosts](./linux/dedicated-hosts.md) or an [isolated VM](../security/fundamentals/isolation-choices.md). Maintenance control gives you the option to skip all platform updates and apply the updates at your choice of time within a 35-day rolling window. For more information, see [Control updates with Maintenance Control and the Azure CLI](maintenance-control.md).
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### Live migration
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## Next steps
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You can use the [Azure CLI](maintenance-notifications-cli.md), [Azure PowerShell](maintenance-notifications-powershell.md) or the [portal](maintenance-notifications-portal.md) to manage planned maintenance.
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You can use the [Azure CLI](maintenance-notifications-cli.md), [Azure PowerShell](maintenance-notifications-powershell.md) or the [portal](maintenance-notifications-portal.md) to manage planned maintenance.

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