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...]

Doing maintenance on a Two-Node (Direct Connect) vSAN configuration

Advertise here with BSAI was talking to a partner and customer last week at a VMUG. They were running a two node (direct connect) vSAN configuration and had some issues during maintenance which were, to them, not easy to explain. What they did is they placed the host which was in the “preferred fault … [Read more...]

vSAN Adaptive Resync, what does it do?

Advertise here with BSAI am starting to get some more questions about vSAN Adaptive Resync lately. This was introduced a while back, but is also available in the latest versions of vSAN through vSphere 6.5 Patch 02. As a result various folks have started to look at it and are starting to wonder what it is. Hopefully by … [Read more...]

Where is the vSAN storage performance proactive test in vSphere 6.5 U1 patch 02?

Advertise here with BSAI had some customers asking where the storage performance proactive test and the multicast proactive test was in the latest release of vSAN. In the past this is what the UI looked like when they would go to the Proactive Test section: But now it looks like this: What happened? Well, two tests … [Read more...]

Can I use a custom TCP/IP stack for the vSAN Network?

Advertise here with BSAI got this question today if you can use a¬†custom TCP/IP stack for the vSAN Network, and I had this before. This question is usually asked by customers who have a stretched cluster as the stretched cluster forces them to create different routes in an L3 network. Especially with a large number of … [Read more...]

Holiday gift: vSAN Essentials book available for free

Advertise here with BSAChristmas is coming so Cormac and I figured we would do something special for everyone, after a long debate we decided to make the vSAN Essentials book available for free. Note that this is the “Essential Virtual SAN” book which was published by VMware Press / Pearson and is based on … [Read more...]

Using HA VM Component Protection in a mixed environment

Advertise here with BSAI have some customers who are running both traditional storage and vSAN in the same environment. As most of you are aware, vSAN and VMCP do not go together at this point. So what does that mean for traditional storage, as in with traditional storage for certain storage failure scenarios you can … [Read more...]

Isolation Address in a 2-node direct connect vSAN environment?

Advertise here with BSAAs most of you know by now, when vSAN is enabled vSphere HA uses the vSAN network for heartbeating. I recently wrote an article about the isolation address and relationship with heartbeat datastores. In the comment section Johann asked what the settings should be for 2-Node Direct Connect with … [Read more...]

vSphere HA heartbeat datastores, the isolation address and vSAN

Advertise here with BSAI’ve written about vSAN and vSphere HA various times, but I don’t think this has been explicitly called out before. Cormac and I were doing some tests this week and noticed something. When we were looking at results I realized I described it in my HA book a long time ago, but it is so … [Read more...]

The difference between an isolation and a partition with vSphere

Advertise here with BSAI have a lot of discussions with customers on the topic of stretched clusters, but also regular vSphere clusters. Something that often comes up is the discussion around what happens in an isolation or partition scenario. Fairly often customers (but also VMware employees) use those words … [Read more...]