VMware vSphere Flash Read Cache (vFRC) is a feature in vSphere 5.5 that utilizes the vSphere Flash Infrastructure layer to provide a host-level caching functionality for virtual machine I/Os using flash storage. The goal of introducing the vFRC feature is to enhance performance of certain I/O workloads that exhibit characteristics suitable for Caching
When using the HotAdd transport mode you are unable to back up disks that are 2 TB or larger in size – KB(2068424)
VMware vCenter Server 5.5.0b – Release Notes
VMware vCenter Server Appliance 5.5.0b (vCSA) – Release Notes
If you are using E1000 adapters in your virtual machines you should take a look at KB 2059053. If the operating system is using Receive Side Scaling (RSS) it is possible that your VMware vSphere 5.0/5.1/5.5 host will die with a purple screen of death (PSOD) with errors containing E1000PollRxRing and E1000DevRx
Resolution:
As long as there is no patch for this bug the only workaround is to use the VMXNET3 adapters instead of the E1000. If you really want to disable RSS in your W2k8/W2k12 Server operating System you can use this command
netsh int tcp set global rss=disabled
There is a new beta release of VMware Virtual SAN available today
VMware Virtual SAN 1.0 is a new storage solution from VMware that is fully integrated with vSphere 5.5. It automatically aggregates server disks in a cluster to create shared storage that can be rapidly provisioned from VMware vCenter during VM creation
You can monitor virtual machine performance using a command-line tool named esxtop. A great reason to use esxtop is the immediate feedback it gives you after you adjust a virtual machine. Using esxtop, you can monitor all four major resource types (CPU, disk, memory, and network) on a particular ESX host
Die einfachste Variante für das Simulieren von SSDs ( z.B.: für VMware Virtual SAN 1.0 mit VMware vSphere 5.5 ) besteht darin dass man die .vmx-Konfigurationsdatei um einen entsprechenden Eintrag ergänzt
Mastering VMware Vsphere 5.5 (Scott Lowe) – Regardless of whether you are a beginner or an virtualization expert – the book will convince the reader and will help to install, configure, manage and monitor a virtual environment
VMware vSphere 5.5 vCenter Appliance – the embedded vPostgres database supports 100 hosts and up to 3000 VMs
