STO1297BE Stretched Clusters or VMware Site Recovery or ... · What are VMware Metro Storage...

STO1297BE

Stretched Clusters or VMware Site Recovery Manager? We Say Both!

Jeff Hunter, VMware, @jhuntervmwareGS Khalsa, VMware, @gurusimran

#VMworld #STO1297BE

VMworld 2017 Content: Not fo

r publication or distri

bution

• This presentation may contain product features that are currently under development.

• This overview of new technology represents no commitment from VMware to deliver these features in any generally available product.

• Features are subject to change, and must not be included in contracts, purchase orders, or sales agreements of any kind.

• Technical feasibility and market demand will affect final delivery.

• Pricing and packaging for any new technologies or features discussed or presented have not been determined.

Disclaimer

2#STO1297BE CONFIDENTIAL



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What are VMware Metro Storage Clusters - vMSC

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– Applications are protected against localized site failures

– Proactive live migrations of applications for continuous availability

– Automated recovery of workloads after host failures

– Single Management console for all workloads

Stretched vSphere Cluster

Stretched Storage

Site A (Active)

Site B (Active)

HA Restart

Live Migration

< 100 KM distance

vCenter



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What you need for an Active-Active datacenter model

• Stretched Storage solution

– Stretched L2 Network

– Storage clustering solution that supports distributed data mirroring

– Read/write access to the same volumes from both sites

– Some tie-break mechanism to avoid split-brain

– Examples: VMware vSAN, EMC VPLEX, IBM SVC, NetApp MetroCluster

Backend Arrays

Site 2

Storage

Controllers

Stretched Volumes Across Sites

Storage

Controllers

Backend Arrays

Site 1

Stretched Volumes



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Keep in mind

• HA

• DRS

• SDRS

• Maintenance/Management

• Cost

• Complexity

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VMware HCI addresses typical challenges of Stretched Clusters

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Complex configuration and management

Expensive to deploy and operate

Creates silos of specialized hardware

COMPUTE STORAGE COMPUTESTORAGE

Typical Stretched Cluster

vSphere

Storage and Replication Management

Simplifies management: policy-based, app-level

Lowers TCO: server economics

Eliminates Silos: your choice of hardware

COMPUTE + SERVER-ATTACHED STORAGE

COMPUTE + SERVER-ATTACHED STORAGE

vSphere vSAN

vSAN Stretched Cluster



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vSAN stretched cluster spans two sites

• Standard x86 hardware

• Up to 15 hosts per site

• 10Gbps recommended

• L2 recommended

– L3 supported

• 5ms or less RTT required

• No multicast in vSAN 6.6.x

• Automated failover using HA

Today

vSphere vSAN

3rd site for

witness

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vSphere vSAN

3rd site for

witness

vSAN stretched cluster witness host deployed at third site

• ESXi virtual appliance

• Deployed from OVA

• Stores metadata only

• Third site latency requirements

– 1-10 hosts/site <200ms RTT

– 11-15 hosts/site <100ms RTT

• 100Mbps, L3 to main sites

5ms RTT, 10GbE

vESXi

Witness Host

VM

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Demo – Configuring a vSAN Stretched Cluster is easy




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Witness

Cache

Capacity Capacity Capacity

Cache

Capacity Capacity Capacity

Preferred Site Secondary Site

Tertiary Site

VM

VMDK

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Stretched cluster component placement

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Stretched cluster local failure protection

• Redundancy against host failure and site failure

• If site fails, vSAN maintains local redundancy in surviving site

• No change in stretched cluster configuration steps

• Minimized I/O traffic across sites

– Local reads, local resyncs

– Single inter-site writes

New in vSAN 6.6




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Stretched Cluster Local Failure Protection – RAID-5

Witness


Tertiary Site

VM

VMDK

New in vSAN 6.6




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New in vSAN 6.6




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Witness


Tertiary Site

VM

VMDK

New in vSAN 6.6




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New in vSAN 6.6




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vSAN stretched cluster

Witness


Tertiary Site

VM VM VM VM VM VM VM VM




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Network partition or site failure

Witness


Tertiary Site

VM VM VM VM

X

X

X

VM VM VM VM




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vSphere HA restarts VMs at the other site

Witness


Tertiary Site

VM VM VM VM

VM VM VM VM

X

X

X

HA Restart




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Witness


Tertiary Site





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Inter-site network disconnected

Witness


Tertiary Site


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X




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vSphere HA powers off VMs at Secondary Site

Witness


Tertiary Site


X

HA Power Off




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vSphere HA restarts VMs at Preferred Site

Witness

Tertiary Site

VM VM VM VM

VM VM VM VM

X

HA Restart





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Witness


Tertiary Site





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Witness host network disconnected

Witness


Tertiary Site


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X




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Witness host leaves cluster, VMs continue to run

Witness


Tertiary Site


X

Witness host leaves cluster




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Witness host is offline, VMs continue to run

Witness


Tertiary Site


X




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Changing the witness host is easy

New in vSAN 6.6




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• Easy and less expensive to deploy

• Lowers complexity with standard x86 server hardware

• Provides local and cross-site availability

However…

• Main data sites must be located no more than 5ms apart

• Large disasters, power grid failure, etc. can take both sites offline

Stretched clusters require a disaster recovery solution




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What is Site Recovery Manager?

• Centralized recovery plans for 1000’s of VMs

• Non-disruptive recovery testing

• Automated DR workflows

• Integrated with the VMware product stack

• Eliminates complexity and risk of manual

processes

• Enables fast and highly predictable RTOs

• Provides policy-driven DR control for any

virtualized app

vSphere

vCenter ServerSite Recovery

ManagervCenter Server

Site Recovery

Manager

vSphere

Production Site Recovery Site

Servers ServersArray-based

replication

vSphere

Replication



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Transforms Management of Recovery And Migration Plans

❖ Weeks or months to set up recovery plans

❖ Unstructured and manual makes them error-prone

❖ Quickly fall out of sync with infrastructure changes

✓ Simple set up in minutes

✓ Software-defined workflows eliminate errors

✓ Simple to update and keep in sync with changes

From Complex Runbooks… …to Simple Recovery Plans



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SRM Demo




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What is vSphere Replication?

• Per-VM, host-based replication

• Network-efficient by replicating only changed data

• Included with vSphere Essentials Plus and higher editions

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OS

Data

App

OS

Data

App

SAN vSAN

vCenter

Server

vSphere

Replication

Only changes

are replicated

OS

Data

App

OS

Data

App



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vSphere Replication Features and Benefits

• Easy virtual appliance deployment

– Minimal time investment, no hardware procurement

• Integration with vSphere Web Client

– Ease of administration and monitoring

• Protect any VM regardless of OS and apps

– One solution reduces complexity and cost

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OS

Data

AppVMworld 2017 Content: Not fo


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• Flexible recovery point objective (RPO) policies – 5 mins to 24 hours

– Supports a wide variety of business requirements

• Compatible with vSAN, SAN, NAS, local storage

– One solution reduces complexity and cost

• Quick recovery for individual VMs

– Reduces downtime, minimizes resource requirements

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• End-to-end network compression

– Further reduces bandwidth requirements

• Network traffic isolation

– Control bandwidth, improve performance, security

• Windows VSS and Linux file system quiescing

– Increased reliability when recovering VMs

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Management

Replication WAN

LAN



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SRM or vMSC?

• What are the Benefits and Challenges?




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Challenges…

… with vMSC

• No Orchestration

• No non-disruptive testability

• DRS and HA are not site aware

• Availability of a single vCenter managing both sites

… with SRM

• No option for moving VMs without downtime

• Requires multiple vCenters

• Previously, no integration with stretched clusters

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Benefits…

… with vMSC

• Requires a single vCenter

• Zero downtime disaster avoidance

• No need to change IP addresses

• Zero RPO with potential RTO of minutes

… with SRM

• Orchestrated Recovery

• Non-disruptive Testing

• No requirement for stretched L2

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SRM + Stretched Storage

• The best of both

• Stretched storage with SRM

• Orchestrate cross-VC vMotion

• Unified plan for DR, migrations

• Zero-downtime migrations for planned maintenance, disaster avoidance

• Ability to non-disruptively test

• Enhanced reliability

• Lower RTO

vCenterSite

Recovery Manager

Sita A

Stretched Storage

Site B

vCenterSite

Recovery Manager

vSpherevSphere



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SRM integration with Active-Active storage solutions



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Stretched Storage

active-active datacenters with SRM

Site 1 vSphere cluster

vCenter SRM

ESXi ESXi ESXi


ESXi ESXi ESXi

Volume A at Site 1 (Full R/W access)


vCenter SRM

Stretched Networks



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Stretched Storage

scenario 1: local host failures in one site


vCenter SRM

ESXi ESXi ESXi


ESXi ESXi ESXi



vCenter SRMStretched Networks

HA handles local host failuresESXi



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Stretched Storage

scenario 2: disaster avoidance at one site


vCenter SRM

ESXi ESXi ESXi


ESXi ESXi ESXi



vCenter SRM

Stretched Networks

Execute SRM Planned Migration with vMotion

BEFORE disaster

SRM invokes vMotion as per VM priority and dependencies

in Recovery Plan

SRM gives you the “easy button” for handling planned downtime in Active-Active datacenters



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Stretched Storage

scenario 3: faster recovery from unplanned failures


vCenter SRM

ESXi ESXi ESXi


ESXi ESXi ESXi



vCenter SRM

Stretched Networks

Use SRM’s test capability to prepare for site-wide

failures

In a site failure scenario, execute SRM Recovery Plan

at other Active site.

Can be automatically triggered by an external

system

SRM enables a reliable, testable and low RTO solution for handling unplanned failures in Active-Active datacenters



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Stretched Storage Planned Migration

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vMotion in Stretched Storage Recovery Plan

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Stretched Storage in DR Mode

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Stretched Storage in DR Mode

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High availability with stretched cluster, automated DR with SRM


VC VR SRM VM VM VM VM VM

vSAN vSAN

Tertiary Site

VC VR SRM WH

vSAN

Site Recovery Manager

vSAN Stretched Cluster



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Demo – vSAN Stretched Cluster and SRM

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Questions

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STO1297BE Stretched Clusters or VMware Site Recovery or ... · What are VMware Metro Storage...

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Transcript of STO1297BE Stretched Clusters or VMware Site Recovery or ... · What are VMware Metro Storage...