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Licensing Storage VM Storage Policies VMware VSAN vSphere

VSAN 6.2 Part 12 – VSAN 6.1 to 6.2 Upgrade Steps

I’ve already written a few articles around this, notably on stretched cluster upgrades and on-disk format issues. In this post, I just wanted to run through the 3 distinct upgrade steps in a little more detail, and show you some useful commands that you can use to monitor the progress. In a nutshell, the steps […]

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Storage VMware VSAN vSphere

VSAN 6.2 Upgrade – Failed to realign objects

A number of customers have reported experiencing difficulty when attempting to upgrade the on-disk format on VSAN 6.2. The upgrade to vSphere 6.0u2 goes absolutely fine; it is only when they try to upgrade the on-disk format, to use new features such as Software Checksum, and Deduplication and Compression, that they encounter this error. Here […]

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Storage VMware VSAN vSphere

VSAN 6.2 Part 10 – Problematic Disk Handling

In this post, I want to talk about a feature called Problematic Disk Handling. Some history behind why we have such a feature can be found in this post. In VSAN 6.2/vSphere 6.0 U2, Problematic Disk Handling has been improved so that it will unmount a problematic disk/diskgroup for two reasons:

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Storage stretched cluster VMware VSAN vSphere witness host

VSAN 6.2 Part 9 – Replacing the witness appliance

There might be a reason in VSAN stretched cluster environments or in 2-node VSAN ROBO deployments to change the witness appliance. The one thing to keep in mind is that you must use a witness appliance that has the same on-disk format as the rest of the disk groups in the cluster. Right now, there […]

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deduplication Storage stretched cluster VM Storage Policies VMware VSAN vSphere witness host

VSAN 6.2 Part 8 – Upgrading VSAN Stretched Cluster from 6.1 to 6.2

This is an exercise that we ran through in our lab environment, and we thought that the steps would be useful to share here. By way of introduction, our 4 node cluster is split into a 2+2+1 configuration, where there are 2 ESXi hosts on site A (VLAN 4), 2 ESXi hosts on site B […]

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checksum erasure coding Storage VMware VSAN vSphere

VSAN 6.2 Part 7 – Capacity Views

If you’ve been following my series on VSAN 6.2 blog posts, you’ll be aware of a considerable number of new features, especially around space efficiency, such as deduplication and compression. On top of this, there is a new on-disk format (v3) and a new software checksum mechanism. All of these features introduce some capacity overhead […]

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Performance Storage vCenter Server VM Storage Policies VMware VSAN vSphere

VSAN 6.2 Part 6 – Performance Service

Many seasoned VSAN administrators will know how heavily we rely on VSAN Observer to get an understanding of the underlying performance of VSAN. While VSAN Observer is a very powerful tool, it does have some drawbacks. For one, it does not provide historic performance data, it simply gives a real-time view of the state of […]