vSphere 7: Persistent Memory (PMEM)

Persistent Memory (PMEM) aka Non-Volatile Memory (NVM) is a type of non-volatile DRAM (NVDIMM) that has the speed of DRAM and it retains the contents through power cycles. Persistent memory (PMEM) is a solid-state high-performance byte-addressable memory device that resides on the memory bus. PMem provides new storage tier that can be used by enterprise … Continue reading vSphere 7: Persistent Memory (PMEM)

NFS 3.0 vs NFS 4.1 Locking mechanism

NFS 3 locking on ESXi does not use the Network Lock Manager (NLM) protocol. Instead, VMware does provide it's own locking protocol. NFS 3 locks are implemented by creating lock files on the NFS server. Lock files are named .lck-file_id.NFS 4.1 uses share reservations as a locking mechanism. File locking mechanisms are used to restrict … Continue reading NFS 3.0 vs NFS 4.1 Locking mechanism

What is VMware VMFS 5?

VMFS5:  VMware proprietary file system that is virtualization aware and optimized for virtualization. Supports concurrent access to shared storage. Can be expanded dynamically. Uses a 1 MB regular block size, for storing large virtual disk files. Uses sub-block addressing, storing small files: the sub-block size is 8 KB. If file size is less than 1 … Continue reading What is VMware VMFS 5?

iSCSI Naming convention

Terminologies IQN iSCSI Qualified Name, an identifier format defined by the iSCSI protocol T10 A technical committee within INCITS that develops standards and technical reports on I/O interfaces, particularly the series of SCSI (Small Computer Systems Interface) standards.  See http://www.t10.org. T11 A technical committee within INCITS responsible for standards development in the areas of Intelligent Peripheral … Continue reading iSCSI Naming convention