vCenter 5.0U2 and ESXi 5.0U2 Released

Hi all, Prior to the holidays, VMware released new versions of vCenter & ESXi on December 20th. There were new releases for both vSphere 5.0 & 5.1. In this post, I want to discuss release 5.0 Update 2. There were a number of notable fixes specific to storage which I wanted to highlight. I will follow-up with a look at storage enhancements in the new 5.1 release in a future post.

Heads Up! NimbleOS Maintenance Release

Folks, if you are a Nimble Storage customer, and I know many of my readers are, then you need to be aware of a new NimbleOS release. A new maintenance update, NimbleOS, was released last week and has a number of fixes which one might deem critical. Nimble are advising all customers to move to this new build to avoid running into these issues. From a VMware perspective, this new release also gives new performance improvements, & Nimble have asked us to urge our mutual customers to upgrade to this new release. For further information, including prerequisites, etc, refer…

New updates from Nutanix – NOS 3.0 and NX-3000

Yesterday I had the opportunity to catch up with a very good friend of mine, Ray Hassan, who is now part of the Nutanix team in the UK. Ray took some time out of his very busy schedule to give me an overview of the new Nutanix platform, the NX-3000. He also gave me the low-down on the new Nutanix OS (NOS) 3.0 features. I don’t think Nutanix need much of an introduction these days. Although they are still a relatively young company, they have already made a significant impression in the storage space, and have won many awards for…

NFS Best Practices – Part 4: Sizing Considerations

Welcome to the next installment of NFS Best Practices. In this fourth and final best practice section on NFS, I asked a number of our major NAS storage partners some sizing questions. The questions basically fell into 3 different categories: Do you have a recommended NFS volume size/sweet-spot recommendation? Do you have a volume block size recommendation that should be configured on the array? Do you have a recommended number of VMs per NFS datastore? In fact, the responses from the vendors were all pretty similar. Let’s take a look at what they had to say.

Could not detect setting of sitpua for device Error Not supported.

I recently received a question about the following message appearing in the VMkernel logs of an ESXi host: 2012-12-07T12:15:58.994Z cpu17:420151)ScsiDeviceIO: 6340: Could not detect setting of sitpua for device Error Not supported. So what does that mean? Firstly, it isn’t anything to be greatly concerned about. SITPUA, short for Single Initiator Thin Provisioning Unit Attention, is related to Out Of Space (OOS) conditions on Thin Provisioned LUNs. To ensure that an Out Of Space (OOS) warning is sent to just one host using the affected LUN,  the SITPUA bit in the Thin Provisioning Mode Page must be set to…

NFS Best Practices – Part 3: Interoperability Considerations

Welcome to part 3 of the NFS Best Practices series of posts. While part 1 looked at networking and part 2 looked at configuration options, this next post will look at interoperability with vSphere features. We are primarily interested in features which are in some way related to storage, and NFS storage in particular. While many of my regular readers will be well versed in most of these technologies, I’m hoping there will still be some items of interest. Most of the interoperability features are tried and tested with NFS, but I will try to highlight areas that might be…

An Introduction to Flash Technology

As many of you are aware, VMware made a number of announcements at VMworld 2012. There were three technical previews in the storage space. The first of these was on Virtual Volumes (VVols), which is aimed at making storage objects in virtual infrastructures more granular. The second was Virtual SAN (VSAN), previously known as Distributed Storage, a new distributed datastore using local ESXi storage. The final one was Virtual Flash (vFlash). However, rather than diving into vFlash, I thought it might be more useful to take a step back and have a look at flash technologies in general.