Skip to content

Commit 3f200df

Browse files
authored
Revert "Update deploy-vsan-stretched-clusters.md"
1 parent 8c6f356 commit 3f200df

File tree

2 files changed

+11
-18
lines changed

2 files changed

+11
-18
lines changed

articles/azure-vmware/deploy-vsan-stretched-clusters.md

Lines changed: 11 additions & 16 deletions
Original file line numberDiff line numberDiff line change
@@ -1,13 +1,13 @@
11
---
2-
title: Deploy vSAN stretched clusters (Preview)
2+
title: Deploy vSAN stretched clusters
33
description: Learn how to deploy vSAN stretched clusters.
44
ms.topic: how-to
55
ms.service: azure-vmware
66
ms.date: 09/02/2022
77
ms.custom: references_regions
88
---
99

10-
# Deploy vSAN stretched clusters (Preview)
10+
# Deploy vSAN stretched clusters
1111

1212
In this article, you'll learn how to implement a vSAN stretched cluster for an Azure VMware Solution private cloud.
1313

@@ -27,7 +27,7 @@ Stretched clusters allow the configuration of vSAN Fault Domains across two AZs
2727

2828
To protect against split-brain scenarios and help measure site health, a managed vSAN Witness is created in a third AZ. With a copy of the data in each AZ, vSphere HA attempts to recover from any failure using a simple restart of the virtual machine.
2929

30-
The following diagram depicts a vSAN cluster stretched across two AZs.
30+
**vSAN stretched cluster**
3131

3232
:::image type="content" source="media/stretch-clusters/diagram-1-vsan-witness-third-availability-zone.png" alt-text="Diagram shows a managed vSAN stretched cluster created in a third Availability Zone with the data being copied to all three of them.":::
3333

@@ -36,24 +36,19 @@ In summary, stretched clusters simplify protection needs by providing the same t
3636
It's important to understand that stretched cluster private clouds only offer an extra layer of resiliency, and they don't address all failure scenarios. For example, stretched cluster private clouds:
3737
- Don't protect against region-level failures within Azure or data loss scenarios caused by application issues or poorly planned storage policies.
3838
- Provides protection against a single zone failure but aren't designed to provide protection against double or progressive failures. For example:
39-
- Despite various layers of redundancy built into the fabric, if an inter-AZ failure results in the partitioning of the secondary site, vSphere HA starts powering off the workload VMs on the secondary site.
40-
41-
The following diagram shows the secondary site partitioning scenario.
39+
- Despite various layers of redundancy built into the fabric, if an inter-AZ failure results in the partitioning of the secondary site, vSphere HA starts powering off the workload VMs on the secondary site. The following diagram shows the secondary site partitioning scenario.
4240

4341
:::image type="content" source="media/stretch-clusters/diagram-2-secondary-site-power-off-workload.png" alt-text="Diagram shows vSphere high availability powering off the workload virtual machines on the secondary site.":::
4442

45-
- If the secondary site partitioning progressed into the failure of the primary site instead, or resulted in a complete partitioning, vSphere HA would attempt to restart the workload VMs on the secondary site. If vSphere HA attempted to restart the workload VMs on the secondary site, it would put the workload VMs in an unsteady state.
46-
47-
48-
The following diagram shows the preferred site failure or complete partitioning scenario.
43+
- If the secondary site partitioning progressed into the failure of the primary site instead, or resulted in a complete partitioning, vSphere HA would attempt to restart the workload VMs on the secondary site. If vSphere HA attempted to restart the workload VMs on the secondary site, it would put the workload VMs in an unsteady state. The following diagram shows the preferred site failure or complete partitioning scenario.
4944

5045
:::image type="content" source="media/stretch-clusters/diagram-3-restart-workload-secondary-site.png" alt-text="Diagram shows vSphere high availability trying to restart the workload virtual machines on the secondary site when preferred site failure or complete partitioning occurs.":::
5146

52-
It should be noted that these types of failures, although rare, fall outside the scope of the protection offered by a stretched cluster private cloud. Because of those types of rare failures, a stretched cluster solution should be regarded as a multi-AZ high availability solution reliant upon vSphere HA. It's important you understand that a stretched cluster solution isn't meant to replace a comprehensive multi-region Disaster Recovery strategy that can be employed to ensure application availability. The reason is because a Disaster Recovery solution typically has separate management and control planes in separate Azure regions. Azure VMware Solution stretched clusters have a single management and control plane stretched across two availability zones within the same Azure region. For example, one vCenter Server, one NSX-T Manager cluster, one NSX-T Data Center Edge VM pair.
47+
It should be noted that these types of failures, although rare, fall outside the scope of the protection offered by a stretched cluster private cloud. Because of this, a stretched cluster solution should be regarded as a multi-AZ high availability solution reliant upon vSphere HA. It's important you understand that a stretched cluster solution isn't meant to replace a comprehensive multi-region Disaster Recovery strategy that can be employed to ensure application availability. The reason is because a Disaster Recovery solution typically has separate management and control planes in separate Azure regions. Azure VMware Solution stretched clusters have a single management and control plane stretched across two availability zones within the same Azure region. For example, one vCenter Server, one NSX-T Manager cluster, one NSX-T Data Center Edge VM pair.
5348

5449
## Deploy a stretched cluster private cloud
5550

56-
Currently, Azure VMware Solution stretched clusters is in the (preview) phase. While in the (preview) phase, you must contact Microsoft to request and qualify for support.
51+
Currently, Azure VMware Solution stretched clusters is in a limited availability phase. In the limited availability phase, you must contact Microsoft to request and qualify for support.
5752

5853
## Prerequisites
5954

@@ -125,7 +120,7 @@ Azure VMware Solution stretched clusters are available in the following regions:
125120

126121
As of now, the only 3 regions listed above are planned for support of stretched clusters.
127122

128-
### What kind of SLA does Azure VMware Solution provide with the stretched clusters (preview) release?
123+
### What kind of SLA does Azure VMware Solution provide with the stretched clusters limited availability release?
129124

130125
A private cloud created with a vSAN stretched cluster is designed to offer a 99.99% infrastructure availability commitment when the following conditions exist:
131126
- A minimum of 6 nodes are deployed in the cluster (3 in each availability zone)
@@ -142,12 +137,12 @@ No. A stretched cluster is created between two availability zones, while the thi
142137
- Scale out and scale-in of stretched clusters can only happen in pairs. A minimum of 6 nodes and a maximum of 16 nodes are supported in a stretched cluster environment.
143138
- Customer workload VMs are restarted with a medium vSphere HA priority. Management VMs have the highest restart priority.
144139
- The solution relies on vSphere HA and vSAN for restarts and replication. Recovery time objective (RTO) is determined by the amount of time it takes vSphere HA to restart a VM on the surviving AZ after the failure of a single AZ.
145-
- Preview and recent GA features for standard private cloud environments aren't supported in a stretched cluster environment.
140+
- Preview features for standard private cloud environments aren't supported in a stretched cluster environment. For example, external storage options like disk pools and Azure NetApp Files (ANF), Customer Management Keys, Public IP via NSX-T Data Center Edge, and others.
146141
- Disaster recovery addons like, VMware SRM, Zerto, and JetStream are currently not supported in a stretched cluster environment.
147142

148143
### What kind of latencies should I expect between the availability zones (AZs)?
149144

150-
vSAN stretched clusters operate within a 5-milliseconds round trip time (RTT) and 10 Gb/s or greater bandwidth between the AZs that host the workload VMs. The Azure VMware Solution stretched cluster deployment follows that guiding principle. Consider that information when deploying applications (with SFTT of dual site mirroring, which uses synchronous writes) that have stringent latency requirements.
145+
vSAN stretched clusters operate within a 5 minute round trip time (RTT) and 10 Gb/s or greater bandwidth between the AZs that host the workload VMs. The Azure VMware Solution stretched cluster deployment follows that guiding principle. Consider that information when deploying applications (with SFTT of dual site mirroring, which uses synchronous writes) that have stringent latency requirements.
151146

152147
### Can I mix stretched and standard clusters in my private cloud?
153148

@@ -159,7 +154,7 @@ Customers will be charged based on the number of nodes deployed within the priva
159154

160155
### Will I be charged for the witness node and for inter-AZ traffic?
161156

162-
No. While in (preview), customers won't see a charge for the witness node and the inter-AZ traffic. The witness node is entirely service managed, and Azure VMware Solution provides the required lifecycle management of the witness node. As the entire solution is service managed, the customer only needs to identify the appropriate SPBM policy to set for the workload virtual machines. The rest is managed by Microsoft.
157+
No. While in limited availability, customers won't see a charge for the witness node and the inter-AZ traffic. The witness node is entirely service managed, and Azure VMware Solution provides the required lifecycle management of the witness node. As the entire solution is service managed, the customer only needs to identify the appropriate SPBM policy to set for the workload virtual machines. The rest is managed by Microsoft.
163158

164159
### Which SKUs are available?
165160

articles/azure-vmware/toc.yml

Lines changed: 0 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -164,8 +164,6 @@
164164
href: azure-vmware-solution-horizon.md
165165
- name: Deploy Citrix on Azure VMware Solution
166166
href: azure-vmware-solution-citrix.md
167-
- name: Deploy vSAN stretched clusters
168-
href: deploy-vsan-stretched-clusters.md
169167
- name: Move resources
170168
items:
171169
- name: Move Azure VMware Solution subscriptions

0 commit comments

Comments
 (0)