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...]

Changing advanced vSphere FT related settings, is that supported?

Advertise here with BSAThis week I received a question around changing the values for vSphere FT related advanced settings. This customer is working on an environment where uptime is key. Of course the application layer is one side, but they also want to have additional availability from an infrastructure perspective. … [Read more...]

Using a vSphere custom TCP/IP Stack for iSCSI

Advertise here with BSAI noticed a question today on an internal slack channel and it was about the use of custom TCP/IP stacks for iSCSI storage environments. Cormac and I updated a bunch of Core Storage whitepapers recently, and one of them was the iSCSI Best Practices white paper. It appears that this little section … [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...]

Unable to login because of a ESXi root account lockout

When starting one of my VMware ESXi 6.5 lab hosts I was unable to login using the vSphere Host Client. I tried to make an SSH session to the host but got an “Access Denied” message. When Using the Direct Console Interface (DCUI) I was able to login using the root account. In the log folder (under /var/log) … [Read more...]

Insufficient configured resources to satisfy the desired vSphere HA failover level

Advertise here with BSAI was going over some of the VMTN threads and I noticed an issue brought up with Admission Control a while ago. Completely forgot about it until it was brought up again internally. With vSphere 6.5 and vSphere HA there seems to be a problem with some Admission Control Policies. When you for … [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...]

vSphere and iSCSI storage best practices

Advertise here with BSAAnd here’s the next paper I updated. This time it is the iSCSI storage best practices for vSphere. It seems that we have now overhauled most of the core storage white papers. You can find them all under core storage on storagehub.vmware.com, but for your convenience I will post the iSCSI … [Read more...]