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Frame vs. frame-less storage

28 July 2015
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Reading Time: 2 minutesOne old (and now quite not used anymore) storage concept was about the Frame vs. frame-less architectures. Those terms are from the past decades and where used (especially from Dell-EqualLogic) to identify how storage controllers are dedigned and how they can scale: Frame-based storage contain individual components that scale independently (you can add more cache, network connections, disks, software, etc.) until it’s maxiums and until the product is still supported. Usually you have two storage controllers and one ore more shelves of disks. Frame-less storage is modular where each “module” include it’s own storage processors, […]

Highlights, vStorage

Dell EqualLogic VSM – Introduction

21 July 2015
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Reading Time: 3 minutesDell EqualLogic Virtual Storage Manager (VSM) for VMware is a VMware vCenter plug-ins that allows administrators to manage their EqualLogic groups and coordinate data protection and recovery within their vSphere environment. The Dell VSM is a virtual appliance that is downloaded as part of the all-inclusive Dell EqualLogic software support and can be installed into an existing VMware vCenter environment. The management can be done both within the vSphere Client (for old versions) or the vSphere Web Client (basically VSM management it’s just a web oriented interface). Actually exist two main versions of this product:

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iSCSI strikes back in Nutanix storage

30 June 2015
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Reading Time: 3 minutesHistorically, Nutanix was built around iSCSI but then they have add the ability to run NFS as well as other front-end IP based protocols. Starting from version 2.5, NFS/NDFS has become the preferred protocol for the Nutanix cluster. Although the Nutanix Distributed File System (NDFS) is stretched across all nodes and build on the pool of each local storage resource, all I/O for a VM is served by the local CVM. The storage can be presented via iSCSI, NFS or SMB3 (introduced in NOS 3.5) to the hypervisor from the CVM (not only the local, […]

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Nutanix Erasure Coding-X

29 June 2015
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Reading Time: 3 minutesOne of the big announces at the .NEXT Conference, was the introduction of erasure coding across nodes (in RAIN configuration) in Nutanix Operating System (NOS) version 4.1.3 (actually it’s a tech preview). Nutanix Erasure Coding–X (EC-X) is a proprietary, native, patent pending, implementation of Erasure Coding. With EC-X, Nutanix customers are able to increase their usable storage capacity by up to 70%. As written in a previous post, Erasure Coding (EC) is a way to implement data proctection in storage systems instead of using RAID techniques.

Nutanix, vStorage none

What are Erasure Coding and RAIN?

26 June 2015
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Reading Time: 4 minutesWhen you talk about data protection against hardware failure in storage system, probably RAID (Redundant Array of Independent Disks) is the first technology that you think. RAID could be hardware or software based, and in the second case it can be implemented (with functions similar to RAID, but not necessary the same) also at the filesystem level (think about ZFS, for example). But with the new hard disk drive (HDD) capacities edging upwards (6TB HDDs are now available) the traditional RAID is becoming increasingly problematic both for the rebuild time and the bottleneck related to each single […]

Highlights, vStorage

Deprecated VMFS volume warning in ESXi 6.0

11 June 2015
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Reading Time: 2 minutesRecently I’ve got a strange issue on ESXi 6.0: after an host reboot the ESXi hosts display a false positive warning: Deprecated VMFS volume(s) found on the host. Please consider upgrading volume(s) to the latest version Starting with vSphere 6.0 the VMFS3 version is now deprecated, but in my case all block based datastores were already at VMFS version 5!

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DellEMC HCI portfolio

Reading Time: 2 minutesDell Storage portfolio has grown in those years, also from some acquisitions (EqualLogic and Compellent) and some partnership (like the recent with Nutanix for the XC Series) becoming more complete and spread. Actually there are three main lines in the “traditional” storage world that include: MD3 series (based on NetApp technologies), PS series (based on EqualLogic) and SC series (based on Compellent). And new solutions for the hyper-converged world, including the XC series and VMware EVO:RAIL appliances (but also other partnership, like the one with Nexenta or RedHat).

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