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Storage scale-up vs. scale-out

11 June 2014
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Reading Time: 5 minutesIn an old post about storage architectures is described in a simple way some basic concepts, including the scale-in (or scale-up) vs. the scale-out approach. They are different approaches in scaling with different implications. Unfortunately there is a simple an well accepted definition on what is a scale-out storage is (or not is): some are limited in specific contests (like this one only for NAS or this SNIA tutorial still applied to a NAS storage), other are too much vendor specific. But usually a scale-out storage imply: Multi-device (or multi-array) storage systems (aggregated in a […]

Highlights, vStorage

How to handle the APD issue in vSphere

15 November 2013
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Reading Time: 4 minutesIn VMware ESXi the All Paths Down (APD) or Permanent Device Loss (PDL) condition is what occurs on an ESX/ESXi host when a storage device is removed in an uncontrolled manner from the host (or the device fails), and the VMkernel core storage stack does not know how long the loss of device access will last. A typical way of getting into APD would be a Fiber Channel switch failure or (in the case of an iSCSI array) a network connectivity issue. But there are also other scenarios that we will discuss later. VMware vSphere […]

Highlights, VMware, vStorage

VMware related acronyms

10 September 2013
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Reading Time: 3 minutesDuncan Epping has wrote (on 2010) a nice post with the meaning of several, not too obvious, VMware acronyms used sometime in some product name, but usually in the internal process or file name. In those post you can found also some interesting facts about the meaning and the origin of some names. Now I’ve just put a copy here and short the list alphabetically and also added some new entries:

Highlights, VMware none

IaaS vs. PaaS vs. SaaS

23 July 2013
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Reading Time: 7 minutesOne of the several interesting topics discussed in the recent event Cloud Communities Day, held on Monday 22 in Milan and with the presence of various communities, as well as analysts and academics, was which could be the most interesting type of cloud. If we limiting to the three basic types: Infrastructure as a Service (IaaS), Platform as a Service (PaaS) or Software as a service (SaaS)… Which one could be the more interesting? As often “it depends” could be the answer, but paradoxically, many have very clear opinions about it (though it is not […]

General, Highlights

The “IT divide” problem

Reading Time: 7 minutesThis was a guest post on vDestination. Usually (especially in Country like mine) we common talk about the Digital divide that bring not equity, or at least not same opportunity, between different group. But this is mainly focused on the connectivity aspects and how accessing to broadband networks could be different and limited for somebody. But this it’s only one aspect and there are also others that must be considered!

General, Highlights none

ESXi Installable vs. ESXi Embedded

Reading Time: 2 minutesESXi is the unified version of the VMware hypervisor, but it could be installed on a host in different way: Embedded: is a OEM version usually shipped with the host Installable: is the one available from the VMware download site PXE: is used in the AutoDeploy environment If could be obvios know if you have a PXE type, how is possible find if you have an Installable or Embedded version? The destination media is not enough because you can install ESXi also over the vendor’s SD card used for the embedded versions.

Highlights, VMware

Virtualization products comparison

26 June 2013
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Reading Time: 4 minutesVirtualization products comparisons are almost common, but usually are too much (single) vendor oriented and each try to bring better conclusion on its products. So it’s difficult find something that it’s really independent. Also customer experiences could be polarized by their knowledge and the experience itself, or (and this could be worst) by a better design or architecture choice. I’ve write something one year ago (see this post), but of course products change so things also change. So part is still valid and part must be updated.

Highlights, Microsoft, VMware, vProducts , , , ,
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