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Update maintenance-and-updates.md
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articles/virtual-machines/maintenance-and-updates.md

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Most nonzero-impact maintenance pauses the VM for less than 10 seconds. In certain cases, Azure uses memory-preserving maintenance mechanisms. These mechanisms pause the VM, typically for about 30 seconds, and preserve the memory in RAM. The VM is then resumed, and its clock is automatically synchronized.
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Memory-preserving maintenance works for more than 90 percent of Azure VMs. It doesn't work for G, L, 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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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 from platform monitoring tools. Maintenance operations that do not require a reboot may occur simultaneously in paired regions or Availability Zones. For a given change, the deployment are mostly sequenced across Availability Zones and across Region pairs, but there can be overlap at the tail.
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### Live migration
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Live migration is an operation that doesn't require a reboot and that preserves memory for the VM. It causes a pause or freeze, typically lasting no more than 5 seconds. Except for G, M, N, and H series, all infrastructure as a service (IaaS) VMs, are eligible for live migration. Eligible VMs represent more than 90 percent of the IaaS VMs that are deployed to the Azure fleet.
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Live migration is an operation that doesn't require a reboot and that preserves memory for the VM. It causes a pause or freeze, typically lasting no more than 5 seconds. Except for G, L, M, N, and H series, all infrastructure as a service (IaaS) VMs, are eligible for live migration. Eligible VMs represent more than 90 percent of the IaaS VMs that are deployed to the Azure fleet.
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> [!NOTE]
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> You won't recieve a notification in the Azure portal for live migration operations that don't require a reboot. To see a list of live migrations that don't require a reboot, [query for scheduled events](./windows/scheduled-events.md#query-for-events).

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