vSAN Operations: Disk Failure Impact

Using vSAN as vSphere storage has many advantages, it's cheap, performs well and it's easy to configure. What hasn't been widely discussed are the operational impacts of running vSAN (or any HCI for that matter). This is especially relevant for large organisations, with separate storage, virtualization and datacenter server teams.…

Turn on Disk LED on HP P840 Storage Contoller

A feature of the ESXi 6 host is the ability for the VMware admin to turn on the LED of a physical disk from the web client (or command line), which enables them to indicate disks to datacenter staff. Running a vSAN cluster with HP Proliant DL380 G9s using a…

vSAN Host Capacity Design

Designing a vSAN cluster from scratch poses a lot of challenges. One of the challenges I encountered is to ensure that resources (memory, CPU and storage) in the cluster gets utilized evenly, and that you for instance don't run out of memory while having plenty of remaining storage capacity. I…

vSAN VM Write Latency Bug

Having recently had the opportunity to do a bit of performance analysis of a hybrid vSAN cluster, I recently found a bug, causing high VM write latency and reduced read cache hit rate. Configuration The vSAN environment analysed is a 6 host cluster running ESXi 6.0U2 (vSAN 6.2)…