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Arunraj Subramanian, VMwareTrung Hua, VMware

HCI Lessons from the Field

©2019 VMware, Inc.

Disclaimer

This presentation may contain product features or functionality 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 features/functionality/technology discussed or presented, have not been determined.

This information is confidential.

The information in this presentation is for informational purposes only and may not be incorporated into any contract. There is no commitment or obligation

to deliver any items presented herein.

©2019 VMware, Inc.

Agenda

3

Key lessons from the Field

• Design and Configuration

• Performance

• Capacity Management

• Maintenance & Operations

• Troubleshooting

4©2019 VMware, Inc.

Design and Configuration

©2019 VMware, Inc. 5

Key things to consider when you start a HCI deployment

1. Design to HCL

2. Firmware/drivers up to date

3. Storage Class Network Switches; I.e. 25Gbps NICs

4. Choose appropriate Storage Policy and No. of Nodes

5. Design for resilience and performance


Performance


Achieve the Best Performance from HCI

1. Don’t oversubscribe – use NIOC on vDS

2. Right Size Disk groups and select NVMe for Cache and Capacity

3. Dedicated Controllers for Disk Groups

4. Enable only required services –Encryption, Deduplication and Compression t

5. Mirror vs Erasure Coding

Storage and Networking devices and configurations are key


Capacity Management


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Free (Slack) Space Is Critical to a vSAN EnvironmentvSAN relies on free capacity for ongoing redistribution of object components

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Capacity for object components

Slack for component movement (~30%)

Cluster Capacity

Hot spare capacity (e.g. N+1)

1. Use the appropriate Storage Policy

2. Slack space considerations –30 % recommended

3. Hot Spare Capacity - N + 1 or N + 2 (beyond slack space needs)

4. Monitor usable capacity via vSAN capacity views

5. Add capacity by scaling out or up


Maintenance and Operations


Maintenance Considerations

1. Ensure vSAN Health Checks are green during regular maintenance

2. Choose the correct Maintenance Mode

3. Leverage vSphere Update Manager (VUM)

4. Avoid Parallel remediation of vSANNodes

5. Perform Proactive Disk rebalancing

Enhanced VUM integration is very popular

Custom BaselineCustom Baseline Custom Baseline

Release Catalog

HCL Database

vmware.com

vSphere Update Manager

ControllerDriver Recommendations

ControllerFirmware Recommendations

System Baseline

1. Update I/O Controller

firmware & Drivers2. Update Software

based on HCL


Troubleshooting


Key Troubleshooting Tips

1. Perform vSphere, vSANand Hardware Health Checks

2. Configure “Persistent” logging for performing RCA

3. Enable vSANPerformance services and vSAN Support Insight (CEIP)

4. Leverage VMware Skyline for vSphere and vSANHealth and Best Practices notifications

Approach the problem using a logical and defined approach

Built-in health checks

Non-vSAN Env.

checks

Cluster svcs. & storage policies

Clustertopology

Hardware

Environment

InfrastructureAdministrators

VMware GSS

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06

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