Hi Adam, (sorry dropped the ball on this one :() On 10/31/18 13:12, Adam Goryachev wrote: > I know I've used internal "boxes" to convert from 3 x 5.25" bays to > multiple 3.5" bays and/or 2.5" bays, but I seem to be having a lot of > trouble finding the right terms to search for now. Could you point me in > the direction of something that you have used in the past? Trying to fit > 16x2.5" drives into a single system might be a squeeze otherwise. Even though we run servers by quite a range of manufacturers, for individual systems we usually go with Supermicro based boxes, e.g. https://www.supermicro.com/products/chassis/2U/213/SC213AC-R1K23LPB or https://www.supermicro.com/products/chassis/2U/216/SC216BE1C-R920WB depending, how many disks you want to cram inside - these come with a SAS backplane, i.e. you just run the HBA cables to the backplane itself which will "convert" this to standard SATA for the SSDs > I'll be using RAID6 across the 16 x 800G drives to give 11.2TB usable > space, with a possible 11.4TB using 7 x 1.9TB SSD in RAID5 on the > primary servers (so we would need to make sure we don't provision more > than the 11.2TB on the backup server). > Sounds like a viable approach except I would not want to endorse RAID5 without an extra layer of checksums on top of it as we had at least one system in the (distant) past where the then used hardware RAID controller told us that a stripe was faulty, but could not decide which disk was faulty which totally hosed our file system afterwards. For that reason we only use RAID6 or if we need to go with a RAID5 like approach (for size/performance), we usually go with ZFS's raidz system where this should not happen - knocking on wooden 8-ball ;). Cheers Carsten -- Dr. Carsten Aulbert, Max Planck Institute for Gravitational Physics, Callinstraße 38, 30167 Hannover, Germany Phone: +49 511 762 17185
