vSAN Erasure Coding Failure Handling
I had a very interesting question recently about how vSAN handles a failure in an object that is running with an erasure coding configuration. In the case of vSAN this is either a RAID-5 or a RAID-6. On vSAN, a RAID-5 is implemented with 3 data segments and 1 parity segment (3+1), with parity striped across all four components. RAID-6 is implemented as 4 [...]
VMware vSAN 6.7U1 deep dive book now available
I am delighted to announce the availability of our newly updated VMware vSAN 6.7U1 Deep Dive book. This is the 3rd edition of the book. As the title states, this book's [...]
NFS TCP Connections on vSphere revisited
Some time back, nearly 6 years ago in fact, I wrote about how you might hit the NFS maximum value for the number of connections you can have per IP address when mounting a lot [...]
Kubernetes, Hadoop, Persistent Volumes and vSAN
At VMworld 2018, one of the sessions I presented on was running Kubernetes on vSphere, and specifically using vSAN for persistent storage. In that presentation (which you can [...]
Fun with PKS, K8s, VCP, StatefulSets and Couchbase
After just deploying the newest version of Pivotal Container Services (PKS) and rolling out my first Kubernetes cluster (read all about it here), I wanted to try to do [...]
vSAN 6.7U1 – Capacity History – Unable to query charts data
A very quick heads-up to let you know about an issue some of us experienced with vSAN 6.7U1 and about how to resolve it. We noticed that after upgrading to vSAN 6.7U1, the new [...]
PKS deployment revisited – some changes in v1.2.2
It is almost 6 months since I last rolled out a deployment of Pivotal Container Service (PKS). I just did a new deployment this week using some of the more later builds of [...]
A primer on First Class Disks/Improved Virtual Disks
A First Class Disk (FCD), also referred to as Improved Virtual Disk (IVDs), is one of the more recent features in vSphere that may have escaped your notice. FCDs were created [...]