VMware Virtual SAN (or VSAN) is getting lots of attention, just like many other software defined storage solutions. In short, VSAN aggregates local storage consisting of SSD and HDD to a distributed storage pool. Some of the advantages are simplified management, lower costs and more agility compared to traditional storage solutions.
A collection of many URLs with info on VSAN is to be found at vSphere-Land.
While VMworld is only a couple of days away VMware released an online tool called ‘Virtual SAN sizing too’l.
Virtual SAN sizing tool can be used to determine the hardware specifications of VSAN nodes based on performance, capacity and availability requirements of the virtual machines to be hosted in the cluster.
According to a blogpost of Rawlinson Rivera these important assumptions should be understood before using this tool:
All hosts in the cluster are assumed to have an identical hardware profile, i.e. numbers of hard drives and flash devices, amount of physical RAM, and number of CPU cores
All virtual machines are assumed to be identical in storage characteristics, i.e. number of VMDKs, size of VMDKs (assumed identical for all disks), number of snapshots, and virtual memory size
All virtual machines are assumed to have the same Virtual SAN policy, i.e. number of failures to tolerate and number of disk stripes per object