A change to sub-blocks on VMFS-6

Something that I only just recently noticed is that we have made a change to the sub-blocks structure on VMFS-6, compared to VMFS-5. Sub-blocks are small allocations on a VMFS volume, and they are used to back small files. They were introduced as a space-saving measure to prevent using a full file block to back a very small file. To put this simply, when a [...]

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vSphere 5.1 Storage Enhancements – Part 9: Storage DRS

This post will look at Storage DRS enhancements in vSphere 5.1. [...]

Heads Up! vSphere 5.1 & EMC Storage

In this post, I want to call out two important matters related to the vSphere 5.1 release & EMC storage. The first is related to Round Robin Path Policy changes, and the [...]

vSphere 5.1 Storage Enhancements – Part 8: Storage I/O Control

Storage I/O Control (SIOC) was initially introduced in vSphere 4.1 to provide I/O prioritization of virtual machines running on a cluster of ESXi hosts that had access to  [...]

Heads Up! ESXi cannot distinguish between EagerZeroedThick & LazyZeroedThick

VAAI NAS introduced the ability to create LazyZeroedThick & EagerZeroedThick disks on NFS datastores. Without VAAI NAS, one can only create thin VMDKs on NFS datastores. [...]

vSphere 5.1 Storage Enhancements – Part 7: Storage vMotion

Let's begin this post with a recap of the Storage vMotion enhancements made in vSphere 5.0. Storage vMotion in vSphere 5.0 enabled the migration of virtual machines with [...]

vSphere 5.1 Storage Enhancements – Part 6: IODM & SSD Monitoring

To build on 5.0 enhancements to make the life of a vSphere administrator easier from a storage perspective, vSphere 5.1 includes additional command for the diagnosis of [...]

vSphere 5.1 Storage Enhancements – Part 5: Storage Protocols

There are a number of storage protocol enhancements in vSphere 5.1. Boot from Software FCoE vSphere 5.0 introduced a new software Fibre Channel over Ethernet (FCoE) [...]