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Peter Velikin

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Top Stories by Peter Velikin

This blog starts a series of blogs we will post regarding Virtual Desktop Infrastructure or VDI.  To directly quote wikipedia "VDI is a desktop-centric service that hosts user's desktop environments on remote servers and/or blade PCs, which are accessed over a network using a remote display protocol."  Basically, VDI means a user can access their desktop from any terminal device capable of running the remote display protocol.  Further, VDI runs a complete implementation of a typical desktop OS (e.g., Windows XP, Windows 7, etc.) as a virtual machine on the host server.  There is no sharing of OS resources between individual VDI clients as with other remote desktop implementations. VDI History VDI history traces back to 2002, before it was even called VDI.  An excellent timeline of the evolution of VDI can be found on Vittorio Viarengo's mobilityjourney blog.  VMwar... (more)

Doggin’ It with VDI

Hey there; the IT Dog back with some color commentary on our VDI experience. When I first heard the name, I thought VDI was the latest model Volkswagen diesel, but as the guy with the suit explained in the last blog, VDI is Virtual Desktop Infrastructure.  Now that you know what VDI means, I am sure you know all there is to know about it, right?  Well, I wish it was that easy for me. Where Do I Begin? I guess I’ll start from the beginning.  At my company, my IT guys were at their wits end trying to manage the 1000 or so desktops, spread out over four different locations, with va... (more)

What Happens When an SSD Wears Out

What To Expect When Flash Stops Flashing We all know that SSDs are made up of NAND-Flash memory chips and that flash memory eventually will wear out.  So, to prepare for the inevitable, we offer you a little up front advice on what to expect when your flash stops flashing. What’s In The Box? We have posted several blogs in the past about NAND-Flash memory and SSDs so I am not going to get into it too deep here.  Basically, SSDs are made up of NAND-technology flash memory chips.  It is a well known and widely discussed fact that flash memory wears out.  There is a limit to the numb... (more)

TRIM Command and the SSD Write Cliff

Well, we may have recently avoided the ‘fiscal cliff’ in Washington DC, but some cliffs cannot be avoided.  Just ask Norm of the TV show “Cheers” how many times he wished he could avoid Cliff Clavin.  In the world of SSDs, the cliff that we want to avoid is the SSD “write cliff.” Why the Write Cliff Matters The SSD write cliff is the effect where SSD write performance drops off after all the free flash memory pages in an SSD have been initially written to and the device cannot provide enough free pages to keep up with subsequent write requests.  Each new write request then require... (more)

Maximize the Advantage of SSD Caching

File System Alignment for SSDs There are many techniques and methods that can be used to tune an IT system to improve overall system performance.  SSD caching is widely being used as a low cost, easy to implement method to quickly increase performance with little or no impact on existing operations.  One thing that needs to be considered when choosing SSD caching is how to configure a file system to maximize the performance increase SSD caching provides. Operating Systems and Block Size In the past few years, the sector size of HDDs has increased from 512 bytes to 4k bytes.  Relat... (more)