Getting Started with VMware Virtual SAN电子书

Getting Started with VMware Virtual SAN

Table of Contents

Getting Started with VMware Virtual SAN

Credits

About the Author

About the Reviewers

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Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. An Introduction to Software-defined Storage and VSAN

What is a Software-defined Data Center?

The significance of Software-defined Storage

The storage choices and form factors of Software-defined Storage

Traditional storage

Software-based storage

Hyper-converged solutions

An introduction to VMware Virtual SAN

Summary

2. Understanding Virtual SAN

Why should I use VSAN?

What is VSAN?

Building blocks of VSAN

Disk groups

VMFS-L

Storage Policy-based Management

Where do I start? Back to the drawing board

Software requirements

Disk boot device

Local storage and boot from SAN

USB and SD card as boot devices

Disk controller

Disk flash devices

Magnetic disks

Network requirements

Some simpler options

Virtual SAN ready nodes

EVO: RAIL

Summary

3. Workload Profiling and Sizing

Capacity planning guidelines

Profiling workloads

Virtual SAN sizing utility

Virtual SAN shapes and sizes

Custom built

VSAN ready nodes

EVO: RAIL

VMware guidelines for sizing and assumptions

Summary

4. Getting Started with VSAN – Installation and Configuration

Key concepts

Disk groups

Virtual SAN network

Prerequisite checklist

Installation workflow

Hardware specifications

Server node

Cluster layout

Network layout

Setting up a VSAN cluster

VSAN ready nodes – installation

Summary

5. Truly Software-defined, Policy-based Management

Why do we need policies?

Understanding SPBM

VSAN datastore capabilities

Accessing the VSAN datastore capabilities

Number of disk stripes per object

Number of failures to tolerate

Scenario based examples

Scenario 1

Scenario 2

Scenario 3

Flash read cache reservation

Force provisioning

Object space reservation

Under the hood – SBPM

vSphere APIs for Storage Awareness

Managing Virtual SAN storage providers

Summary

6. Architecture Overview

Why such an architecture?

Anatomy of I/O

Write buffer

Destaging data to a magnetic disk

The read cache

The READ I/O workflow

Objects, components, and witnesses

What is an object?

A swap object

The virtual machine home namespace

Virtual disks and snapshot delta-disks

Components

A witness

Connecting the dots

Internal building blocks of VSAN

Reliable datagram transport

Cluster monitoring, membership, and directory services

Cluster level object manager

The distributed object manager

The local log structured object manager

VSAN and high availability

A magnetic disk failure

A flash device failure

A host failure

Summary

7. Design Considerations and Guidelines

Network optimizations

Jumbo frames

Speed of the network interface

Network IO control

Isolation, shares, and limits

Quality of Service

Storage configuration optimizations

A flash device

Magnetic disks

I/O controllers

Cache-to-capacity ratio

Capacity

Performance

Availability

A scale-out design

Backing up your VSAN workloads

Creating a local backup through VDP

Creating a local backup to VMFS/NFS through VDP

Creating a remote backup through VDP

vSphere Replication to protect VSAN

Summary

8. Troubleshooting and Monitoring Utilities for Virtual SAN

Troubleshooting workflow

Validating the hardware and configuration limit

Understanding the software components of VSAN

The log structured object manager

The distributed object manager

Cluster monitoring, membership, and directory services

The ESXCLI namespace

Datastore

Network

Storage

Cluster

Policy

Other useful namespaces

esxcli vsan maintenancemode

esxcli vsan trace

cmmds-tool

vdq

Ruby vSphere Console

Manoeuvring around RVC

Command-line options with RVC

Enabling and disabling VSAN

Disk-related commands

Viewing the virtual machine layout

Viewing the physical disk layout

cmmds_find

resync.dashboard

VSAN Observer

Monitoring live statistics

Offline diagnosis

Interpreting VSOB data and key metrics

Summary

9. What's New in VSAN 6.0?

VSAN architecture types

Hybrid VSAN

All-flash VSAN

Disk group creation for an all-flash setup

Tagging flash capacity devices through ESXCLI

Tagging flash capacity devices through Ruby vSphere Client

Validation

Points to remember with all-flash VSAN

The new on-disk format

Snapshot enhancements

The fault domain

JBOD support

Serviceability improvements

LED locators

A what-if scenario

The rebalance operation

Scalability

Summary

Index