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Open Vault storage building blocks offer high disk densities, with 30 drives in a 2U [[Open Rack]] chassis designed for easy [[disk drive]] replacement. The 3.5 inch disks are stored in two drawers, five across and three deep in each drawer, with connections via [[serial attached SCSI]].<ref>{{Cite web |title= Open Vault Storage Hardware V0.7 OR-draco-bueana-0.7 |author= Mike Yan and Jon Ehlen |date= January 16, 2013 |url= http://www.opencompute.org/wp/wp-content/uploads/2013/01/Open_Compute_Project_Open_Vault_Storage_Specification_v0.7.pdf |access-date= July 9, 2013 |archive-date= May 21, 2013 |archive-url= https://web.archive.org/web/20130521151714/http://www.opencompute.org/wp/wp-content/uploads/2013/01/Open_Compute_Project_Open_Vault_Storage_Specification_v0.7.pdf |url-status= dead }}</ref> This storage is also called Knox, and there is also a cold storage variant where idle disks power down to reduce energy consumption.<ref>{{Cite web |title=Under the hood: Facebook's cold storage system|date=May 4, 2015|url=https://code.facebook.com/posts/1433093613662262/-under-the-hood-facebook-s-cold-storage-system-/|access-date=May 13, 2016}}</ref> Another design concept was contributed by Hyve Solutions, a division of [[Synnex]] in 2012.<ref>{{Cite web |title= Hyve Solutions Contributes Storage Design Concept to OCP Community |work= News release |date= January 17, 2013 |url= http://ir.synnex.com/releasedetail.cfm?ReleaseID=733922 |access-date= July 9, 2013 |archive-url= https://web.archive.org/web/20130414055759/http://ir.synnex.com/releasedetail.cfm?ReleaseID=733922 |archive-date= April 14, 2013 |url-status= dead }}</ref><ref>{{Cite web |title= Torpedo Design Concept Storage Server for Open Rack Hardware v0.3 ST-draco-chimera-0.3 |first= Conor |last= Malone |date= January 15, 2012 |url= http://www.opencompute.org/wp/wp-content/uploads/2013/01/Open_Compute_Project_Storage_Server_for_Open_Rack_Specification_v0.3.pdf |access-date= July 9, 2013 |archive-url= https://web.archive.org/web/20130521143229/http://www.opencompute.org/wp/wp-content/uploads/2013/01/Open_Compute_Project_Storage_Server_for_Open_Rack_Specification_v0.3.pdf |archive-date= May 21, 2013 |url-status= dead }}</ref> At the OCP Summit 2016 Facebook together with Taiwanese ODM Wistron's spin-off Wiwynn introduced Lightning, a flexible NVMe JBOF (just a bunch of flash), based on the existing Open Vault (Knox) design.<ref>{{Cite web |title=Introducing Lightning: A flexible NVMe JBOF|first=Chris|last=Petersen|date=March 9, 2016|url=https://code.facebook.com/posts/989638804458007/introducing-lightning-a-flexible-nvme-jbof/|access-date= May 13, 2016}}</ref><ref>{{Cite web |title=Wiwynn Showcases All-Flash Storage Product with Leading-edge NVMe Technology|date=March 9, 2016|url=http://www.wiwynn.com/english/company/newsinfo/23|access-date= May 13, 2016}}</ref>
===Rack and Power designs ===
The designs for a mechanical mounting system have been published, so that open racks have the same outside width (600 mm) and depth as standard [[19-inch rack]]s, but are designed to mount wider chassis with a 537 mm width (21 inches). This allows more equipment to fit in the same volume and improves air flow. Compute chassis sizes are defined in multiples of an [[Open Rack#OpenU|OpenU]], which is 48 mm, slightly taller than the typical 44mm [[rack unit]]. The most current base mechanical specifications were defined and published as the Open Rack V3 Base Specification in 2022, with significant contributions from [[Google]] and [[Rittal]]<ref>{{cite web |last1=Charest |first1=Glenn |last2=Mills |first2=Steve |last3=Vorreiter |first3=Loren |title=Open Rack V3 Base Specification |url=https://www.opencompute.org/documents/open-rack-base-specification-version-3-pdf |website=opencompute.org |publisher=Meta |access-date=25 September 2024}}</ref>.
===Energy efficient data centers ===
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