vSAN Erasure Coding Failure Handling

I had a very interesting question recently about how vSAN handles a failure in an object that is running with an erasure coding configuration. In the case of vSAN this is either a RAID-5 or a RAID-6. On vSAN, a RAID-5 is implemented with 3 data segments and 1 parity segment (3+1), with parity striped across all four components. RAID-6 is implemented as 4 [...]

Read more

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) [...]

vSphere 5.1 Storage Enhancements – Part 4: All Paths Down (APD)

All Paths Down (APD) is a situation which occurs when a storage device is removed from the ESXi host in an uncontrolled manner, either due to administrative error or device [...]

vSphere 5.1 Storage Enhancements – Part 3: vCloud Director

In this post, I want to highlight a number of storage improvements made in vSphere 5.1 that are going to be leveraged by the next release of vCloud Director. [...]

vSphere 5.1 Storage Enhancements – Part 2: SE Sparse Disks

This is possibly the most exciting new storage feature in the vSphere 5.1 release. Space Efficient Sparse Virtual Disks (or SE Sparse Disks for short) were designed to [...]