<div dir="ltr"><div dir="ltr"><div dir="ltr">Saw this recently, a backplane for up to 5 rpi compute modules (rpi but lacking external ports).  It's pricey, but interesting for a contained little farm ($270 for the backplane, $30ea per pi3 compute).<div><br></div><div><a href="https://www.mininodes.com/product/5-node-raspberry-pi-3-com-carrier-board/">https://www.mininodes.com/product/5-node-raspberry-pi-3-com-carrier-board/</a><br><div><br></div><div>Shame none seem to include good wired ethernet options for the units, like this 16 rpi zero board, but sadly never went anywhere for production...</div></div><div><br></div><div><a href="https://www.cnx-software.com/2016/01/22/this-is-what-a-16-raspberry-pi-zero-cluster-board-looks-like/">https://www.cnx-software.com/2016/01/22/this-is-what-a-16-raspberry-pi-zero-cluster-board-looks-like/</a><br></div><div><br></div><div>I use pi's for anything from network testing units, to serial terminal servers (just add 2-4 port usb serial adapters), retropi gaming systems, or even home sprinkler 24v irrigation controllers, but clusters for academic research might be cool if so inclined, and cheaper/more portable than normal compute hardware to play with.</div><div><br></div><div>-mb</div><div><br></div><div><br></div><div><br></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Apr 19, 2019 at 3:01 PM Eric Oyen <<a href="mailto:eric.oyen@icloud.com">eric.oyen@icloud.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;">Well,<div>About all you need is the open_cl package, a small number of recent vintage supported GPU cards, small HDD’s (enough for the OS and some swap space) as much ram as you can stuff in each machine and a good network card and switch combo. The reason for the GPU’s? Bitcoin mining, password cracking/recovery and any other project that supports using multiple gpu cards. If your machines aren’t up to the task, start with a PXE booted cluster of RaspberryPi units (start with an odd number like 3 (one as the master control unit). I had plans to do this myself, but my fixed income here just isn’t up to the task of doing more than paying for the basic bills.</div><div><br></div><div>-Eric</div><div>From the Central Offices of the Technomage Guild, Open Cluster Development and research Dept.</div><div><br><div><br><blockquote type="cite"><div>On Apr 16, 2019, at 7:36 PM, Harold Hartley <<a href="mailto:wheelie207@ownmail.net" target="_blank">wheelie207@ownmail.net</a>> wrote:</div><br class="gmail-m_4861249414527469934Apple-interchange-newline"><div><div style="font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;font-family:Arial">I’m looking at building a cluster and I know there are different types. I haven’t fully decided on what I would be using it for.<br></div><div style="font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;font-family:Arial">Well, I have 4 computers about 3 or 4 years old and all have i5 processing with 8 gigs ram in each. I am not sure what size hard drives I want in them. I am looking at doing animations making my own small video movie like and then post on my blog. Even thought of other uses as well.<br></div><div style="font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;font-family:Arial">Would anyone have an idea what type of cluster I should go with. Thanks</div><div style="font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none;font-family:Arial"><br></div><div id="gmail-m_4861249414527469934sig4468849" style="font-family:AppleSymbols;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none"><div class="gmail-m_4861249414527469934signature">--<br></div><div class="gmail-m_4861249414527469934signature">  Harold Hartley<br></div><div class="gmail-m_4861249414527469934signature">  17632 N. 5th place<br></div><div class="gmail-m_4861249414527469934signature">  Phoenix, AZ 85022<br></div><div class="gmail-m_4861249414527469934signature"> <span class="gmail-m_4861249414527469934Apple-converted-space"> </span><a href="mailto:wheelie207@ownmail.net" target="_blank">wheelie207@ownmail.net</a><br></div><div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