Categories
iSCSI VMware VSAN vSphere

iSCSI on vSAN Stretched Cluster

vSAN readers will most likely be aware that we introduced support for iSCSI on vSAN way back in vSAN 6.5. That is to say, we had the ability to create iSCSI targets and LUNs using vSAN objects, and present the LUNs to external iSCSI initiators. That release also supported Persistent Group Reservations (PGRs) but it […]

Categories
stretched cluster VMware VSAN vSphere

vSAN Stretched Cluster and Horizon View interop update

This question has come up a number of times in the past. However, there have been some updates that I personally was not aware of until last week. To cut to the chase, Horizon View 7 (all clone types) is supported with vSAN stretch cluster. This is good news. However, it is very important that […]

Categories
Flash Storage VVols

Big news from Pure Storage

There was lots of big news yesterday from our friends over at Pure Storage. First of all, we had an announcement about their Virtual Volume (VVol) implementation going GA. This is very exciting for me, and I look forward to testing it out in our lab. The implementation is a VASA 3.0 implementation, which means […]

Categories
fault tolerance Storage VMware VSAN vSphere

Supporting Fault Tolerance VMs on vSAN Stretched Cluster

During one of our many discussions at VMworld 2017, I was asked about supporting Fault Tolerance on vSAN Stretched Clusters, more specifically SMP-FT. Now to be clear, we can support SMP-FT on vSAN since version 6.1. The difficulty with supporting SMP-FT on vSAN stretched cluster has always been the possible latency between the data sites, […]

Categories
Storage stretched cluster VMware VSAN vSphere

How many hosts are needed to implement SFTT in vSAN Stretched Cluster?

Many of you who are well versed in vSAN will realize that we released a Secondary Failures To Tolerate (SFTT) feature with vSAN 6.6. This meant that not only could we tolerate failures across sites, but that we could also add another layer of redundancy to each copy of the data maintained at each of […]

Categories
stretched cluster VMware VSAN vSphere witness host

New vSAN Stretched Cluster Topology now supported

After publishing the vSAN Networking Guide earlier this year, Paudie O’Riordain and I received numerous questions regarding support on having different stretched clusters hosting each other’s witness appliances. These queries arose because we discussed a 2-node (ROBO) topology which allowed this to sort of configuration (i.e. the cross hosting of witnesses) via special request. But […]

Categories
erasure coding stretched cluster VM Storage Policies VMware VSAN vSphere witness host

Erasure Coding and Quorum on vSAN

I was looking at the layout of RAID-5 object configuration the other day, and while these objects were deployed on vSAN with 4 components, something caught my eye. It wasn’t the fact that there were 4 components, which is what one would expect since we implement RAID-5 as a 3+1, i.e. 3 data segments and […]