Scott's Weblog The weblog of an IT pro specializing in virtualization, networking, open source, and cloud computing

Upcoming Podcasts

I’ve been invited to participate in a couple of upcoming podcasts and thought I’d post something here in case you are interested in listening in.

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Technology Short Take #6

Welcome to Technology Short Take #6, the latest collection of links, articles, and thoughts on virtualization, networking, storage, and the intersection of the three. I’m going to try a slightly new format for this post in my Technology Short Take series; I’m interested in knowing what you think about the format.

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SIOC Event with EMC MirrorView

Another topic arose over the last few days on the vSpecialist mailing list around an event that is logged by VMware vCenter Server when you use Storage I/O Control (SIOC) in conjunction with EMC MirrorView. (MirrorView, for those that don’t know, is a replication solution for the EMC CLARiiON arrays.) The focus on the discussion was around the fact that vCenter Server logs an event to the effect that an “external I/O workload has been detected on shared datastore running Storage I/O Control (SIOC) for congestion management”. This particular event is documented by VMware in this VMware KB article.

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RecoverPoint and VAAI Update

Last week I published a quick note about RecoverPoint-VAAI interoperability that outlined some potential concerns around the use of VAAI with RecoverPoint. In that post—which was based on current information from the RecoverPoint product management team—I called out the need to disable some VAAI functionality because it was our understanding that RecoverPoint ignored certain VAAI commands instead of rejecting them as not implemented. (Rejecting them is actually the preferred behavior, since it forces the VMware ESX/ESXi hosts to fall back to pre-VAAI operation.)

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Storage Integration Presentation from East TN VMUG

Last week I was invited to speak at a joint session of the East Tennessee VMware and EMC user groups in Knoxville. Despite some bad weather that kept some people from attending, the meeting was a great success. I’m posting a copy here, via SlideShare, of the presentation that I used for that meeting. Note that the actual presentation had some embedded videos in it that SlideShare won’t translate; these appear as blank slides.

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Disabling VAAI Using the CLI

As a quick follow-up to yesterday’s article about interoperability between RecoverPoint and the vStorage APIs for Array Integration (VAAI), I wanted to post a short “how to” on disabling VAAI for interoperability with RecoverPoint. I’ll show you how to disable all three VAAI primitives, but keep in mind that only the hardware-accelerated copy and hardware-accelerated zero functions need to be disabled if you are using array-based splitters (all three need to be disabled with fabric splitters).

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RecoverPoint and VAAI Interoperability

As most of you probably already know, the addition of the vStorage APIs for Array Integration (VAAI) was a major new feature of VMware vSphere 4.1. For those of you not familiar with VAAI, the short story is that these APIs enable VMware ESX/ESXi to offload certain types of storage operations to VAAI-compliant storage arrays in order to increase efficiency.

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Need Some Help With Subnetting?

Having recently re-certified as CCNA, I can definitely attest that subnetting is something you must master if you want to achieve a Cisco certification. Rightfully so; mastering subnetting is critical to being an effective network administrator, in my opinion.

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Netronome, 1 Year Later

In August 2009 I wrote about a company called Netronome and the network processor they were developing. Late last week I had another conversation with Netronome and was able to follow-up on last year’s discussion as well as get an idea of where they might be headed.

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Shortening URLs via bit.ly the Apple Way

A couple of days ago I wrote about how to use the UNIX CLI in Mac OS X to shorten a URL via bit.ly, while adding the URL to your link history in case you want to re-use it in the future. Now I’m going to take that information and show you how to further integrate this into your Mac’s environment using AppleScript and Automator.

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