vSAN Stretched Cluster: PFTT and SFTT what happens when a full site fails and multiple hosts fail?

Advertise here with BSAThis question was asked on the VMTN community forum and it is a very valid question. Our documentation explains this scenario, but only to a certain level and it seems to be causing some confusion as we speak. To be honest, it is fairly complex to understand. Internally we had a discussion with … [Read more...]

New whitepaper available: vSphere Metro Storage Cluster Recommended Practices (6.5 update)

Advertise here with BSAI had many requests for an updated version of this paper, so the past couple of weeks I have been working hard. The paper was outdated as it was last updated around the vSphere 6.0 timeframe, and it was only a minor update. I looked at every single section and added in new statements and guidance … [Read more...]

Sizing a vSAN Stretched Cluster

Advertise here with BSAI have had this question a couple of times already, how many hosts do I need per site when the Primary FTT is set to 1 and the Secondary FTT is set to 1 and RAID-5 is used as the Failure Tolerance Method? The answer is straight forward, you have a local RAID-5 set locally in each site. RAID-5 is … [Read more...]

vSAN 6.6 Stretched Cluster Demo

Advertise here with BSAI had one more demo to finish and share and that is the vSAN 6.6 stretched cluster demo. I already did a stretched clustering demo when we initially released it, but with the enhanced functionality around local protection I figured I would re-record it. In this demo (~12 minutes) I will show you … [Read more...]

VMware vSAN 6.6 demo

Advertise here with BSAI was playing around with a vSAN 6.6 environment yesterday and I figured I would record a quick demo of some of the new functionality introduced. Took me a bit longer than expected, but here it is. I hope you will find it useful, a 1080p version can be viewed on youtube. "VMware vSAN 6.6 demo" … [Read more...]

vSAN needs 3 fault domains

Advertise here with BSAI have been having discussions with various customers about all sorts of highly available vSAN environments. Now that vSAN has been available for a couple of years customers are starting to become more and more comfortable around designing these infrastructures, which also leads to some … [Read more...]

Two host stretched vSAN cluster with Standard license?

Advertise here with BSAI was asked today if it was possible to create a 2 host stretched cluster using a vSAN Standard license or a ROBO Standard license. First of all, from a licensing point of view the EULA states you are allowed to do this with a Standard license: A Cluster containing exactly two Servers, commonly … [Read more...]

How HA handles a VSAN Stretched Cluster Site Partition

Advertise here with BSAOver the past couple of weeks I have had some interesting questions from folks about different VSAN Stretched failure scenarios, in particular what happens during a VSAN Stretched Cluster site partition. These questions were in particular about site partitions and how HA and VSAN know which VMs … [Read more...]

vMSC and Disk.AutoremoveOnPDL on vSphere 6.x and higher

Advertise here with BSAI have discussed this topic a couple of times, and want to inform people about a recent change in recommendation. In the past when deploying a stretched cluster (vMSC) it was recommended by most storage vendors and by VMware to set Disk.AutoremoveOnPDL to 0. This basically disabled the feature … [Read more...]

Removing stretched VSAN configuration?

Advertise here with BSAI had a question today around how to safely remove a stretched VSAN configuration without putting any of the workloads in danger. This is fairly straight forward to be honest, there are 1 or 2 things though which are important. (For those wondering why you would want to do this, some customers … [Read more...]