vSAN 6.5 was announced along with the vSphere 6.5 and it has also come with many enhancements and this post is to run you through the most important of them. vSAN is growing day by day and there are around 5500 customers now and that’s awesome. Well, to begin with, Virtual SAN is now vSAN; although you still see some VMware press releases mentioning Virtual SAN, remember that’s gonna go away soon. Let’s now review those ‘new’ things.
In this post, we will take a look at the escli commands that can be used to find information of the VSAN cluster. Sometimes it is very helpful to use esxcli commands rather than navigating around different options in web client. Let’s look at some of the frequently helpful esxcli commands for VSAN. esxcli commands are executed on the ESXi ssh console. Make sure SSH is enabled on ESXi host to execute the below commands. Refer my previous post on enabling SSH on ESXi host here. Continue reading
In this post, we will discuss about space efficiency techniques used by Virtual SAN to reduce the amount of space used and to protect the data. The two methods available are Deduplication and Compression and RAID 5/6 Erasure Coding. While Deduplication and compression reduces the space used, Erasure coding technique offers more protection and space-saving over the traditional RAID 1 mirroring. So let’s get into the details Continue reading
Hey there! In this post, we will discuss about the storage policies with respect to VSAN.
Storage policies define the capacity, performance and availability of a VM residing on the vsanDatastore. Once these Storage Policies are assigned to the VM, VM gets deployed based on the requirements mentioned in the storage policy. And how does vCenter know about the underlying storage information? well, that’s when Storage Providers are needed. Continue reading
Hey there! In this post we shall see how a Disk Group is created using the disks attached to the ESXi hosts. Before diving into the creation process, lets gain some understanding of the Role of Flash Disks, vsanDatastore and the Objects associated with a VM.
Flash Device Role
Each Flash Disk that is part of the VSAN cluster will either be used for Read Cache or Write Buffer.
Flash device used as a Read Cache Continue reading
In order for you to make use of latest features provided by VSAN, the On-Disk Format has to be kept updated. The procedure is pretty simple but time consuming if you have large amounts of data.
Once the version is upgraded, you cannot add the older version Hosts to the VSAN cluster. Continue reading
In this post, I am going to show you how to setup VSAN in lab. From my post on VSAN, it is required to have at least 3 ESXi hosts and each host contributing atleast one cache and capacity disk. I have three ESXi hosts in my lab setup configured with required disks, and hosts are part of HA,DRS enabled cluster. Continue reading