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 [...]

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Does Software iSCSI on vSphere support IPsec?

This came up in a conversation today. Does VMware's Software iSCSI implementation support Internet Protocol Security (IPsec) in vSphere 5.1? Internet Protocol Security (IPsec) [...]

Heads Up! Valid Static Address Ranges in vSphere 5.1

If you are planning to upgrade to vSphere 5.1, you need to pay attention to this, especially if you have assigned static MAC addresses to your virtual machines. After [...]

Adaptive Queueing vs. Storage I/O Control

This post is to look at two different technologies available in vSphere to manage the queue depth on your ESXi host(s). A queue determines how many outstanding I/Os can be [...]

QLogic Mt. Rainier Technology Preview

I was fortunate enough yesterday to get an introduction to QLogic's new Mt. Rainier technology. Although Mt. Rainier allows for different configurations of SSD/Flash to be [...]

Heads Up! VOMA – ERROR: Trying to do IO beyond device Size

This is a short note on trying to use VOMA, the vSphere On-disk Metadata Analyzer, on a dump taken from a VMFS-5 volume which was upgraded from VMFS-3. This is not an issue if [...]

Condusiv V-locity 4 – New caching feature

I recently got hold of a copy of the new V-locity 4 product from Condusiv which was released last month. Condusiv is the new name for Diskeeper, whom you may have heard of [...]

Heads Up! Storage DRS scheduler removes rules

One of my friends over in VMware support just gave me a heads-up on this issue. It affects virtual machines with anti-affinity VMDK rules defined (for keeping virtual machine [...]