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The Utah Emulab cluster has 16 **d820** PC nodes (**pc601-pc616**) consisting of:
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* [Dell r820](http://i.dell.com/sites/doccontent/shared-content/data-sheets/en/Documents/Dell_PowerEdge_R820_Spec_Sheet.pdf) 2U servers
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* Four 2.2 GHz 64-bit 8-Core [E5-4620 "Sandy Bridge"
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processors](http://ark.intel.com/products/64607/), 7.20 GT/s bus speed,
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16 MB cache, and VT (VT-x, EPT, and VT-d) support
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* 128 GB 1333 MHz DDR3 RAM (8 x 16GB modules)
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* 4 Broadcom NetXtreme BCM5720C GbE NICs builtin to motherboard (only one in use)
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* 2 dual-port Intel X520 PRO/10GbE PCI-Express NICs
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* 250GB 7200 rpm SATA disk, 6 x 600GB 10000 rpm SAS disks
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### Switch Configuration
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The experiment backplane consists of **four** 10Gb interfaces connected to
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an [Arista 7504](http://www.aristanetworks.com/media/system/pdf/Datasheets/7500_Datasheet.pdf)
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switch.
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**Important**: The interfaces in the d820 nodes are not capable of
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operating at speeds lower than 10Gb, so make sure to request link speeds of
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"10Gb" or "*" in your NS file.
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### Images and Kernel Support
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Currently, the following Emulab standard images are supported on these
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machines:
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* Ubuntu: 64-bit: UBUNTU14-64-STD, UBUNTU16-64-STD
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* CentOS: 64-bit: CENTOS7-64-STD
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* FreeBSD: 64-bit: FBSD102-64-STD
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* Xen 4.6 with Ubuntu "dom0": 64-bit: XEN46-64-STD
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Many of the other standard Emulab images will likely work as well, though
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older FreeBSD and Fedora images will not work.
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### Caveats
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* **No support for 32-bit OS images.** No technical reason here, just low
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priority. 32-bit OSes would allow access to only 4GB of the 128GB of
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RAM, so there is no good reason to use them.
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* **Limited configuration of local storage.** Each of the nodes has six
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600GB hard drives in addition to the 250GB system disk. While these
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drives are connected to a hardware RAID controller, we have them
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configured as "non-RAID" in the BIOS for the time being. You will need
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to use a software RAID solution (e.g., LVM or ZFS) if you want very
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large or very fast local storage. We suggest you look at [Emulab
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Blockstores](http://resolveuid/cd1a09e530154d0eaaf4486042496ecb) as a
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way of configuring the extra disk space. |