SIPB Machine Room Tour It turns out there are interesting things about the machine room to talk about from the outside: there is a thing on the window with debathena sign up keys just in case you don't trust the website Machine room rules: Remember that it is a live production environment So don’t touch stuff you aren’t told to it is loud don't step on cables there is a security system needs to be disabled within 60 seconds will need to rearm the machine room security after *disables security* *group enters the machine room* *issues with security probably ikdc's fault* It is kinda loud and cold look behind you there is a fan pointing to the cluster but it is off if main cooling fails then fan is a backup - this was a hack when chilled water failed and never put grate in if you look near fan there are yellow cables, what are they? - 1 gigabit connected to mit's backbone (40 gigabit) fiber optic - if you go to mit's peering connection, it’s over 200 gbit - this room has as much bandwidth as a single dorm - there is also a pile of hardware (talk to vice chair if you REALLY want to use it): - senator bedfellow a sun microsystem server from 2000 - an hdd from a server looks same as desktop - every now and then mysterious IS&T guy takes these disks to the "shredder in the sky" - good if you need data destroyed - pulls white machine labelled Seagate, what is this? it is a single hard drive, a single gigabyte - has a scsi terminator, you’re supposed to daisy chain them and put that thing on the back to end the chain - systems back then were awful, systems these days are awful in a different way - the ancient 4U 1kw machine, maybe 200 megs of RAM - the tape drive, we used to have tape back ups (large white cabinets) - tapes are actually still very reliable for storage - each tape in the modern drives (at IS&T) are 6 terabytes 2 air handlers -set point at 63 and 65 degrees - they are huge should work - for redundancy but they suck - whenever chilled water cuts out, problems occur, it becomes 50c - have scary looking cables going into beige things? they are battery packs. - they are like early 90s - spare parts shelf, switches hdd, empty box from chromebook that is on the server rack floor: this is a raised floor - has tile puller - plops tile puller onto floor then pulls floor - pulls out floor tile - scary thicknet cables, thinnet cables, ethernet cables, and scary power cables, - thick and thinnet cables had vampire clamps to connect into it. - scary things in floor: device that says do not remove giant hdd, 85 megabytes - remember to stomp on the floor tile after your done air handlers are pushing air into the floor, and special tiles allow for servers to get cool air - get people to pull floor tiles up - we have no idea why there is a hdd in the floor, so we put it back floor tile puller lives on top of pile of junk this table belongs to IS&T don’t trust the computer on it IS&T used to have servers in here the Art why is the art the single most important thing in there - you make you feel better when surrounded by machines - it also hides the rack screws the screws used to screw servers to the rack this piece of art used to be in N42 N42 vacated by IS&T after novartis moved into the neighborhood. student employees rescued art and put it in the machine room - "I have authorized ---- and ---- to move things from n42, don't be alarmed if you see two students moving art" - to MIT campus police remnants from the previous great heat incident the lightbulb - we don’t know about the power distribution in this building - we have emergency power, so if W20 power goes out were still running - taped out space designated to place servers down onto - also a terminal to log into servers - another UPS - 5 kilowatt - cannot go above 50% - don’t want to cause a power cascade problem - we don’t know what the power capabilities of this room LAMP was decommissioned nov 2016 library access to music project developed by Keith Winston (author of MOSH) designed to work around the digital millennium copyright act (DMCA) spotify before spotify How it worked: MIT has a radio license MIT has a coaxial cable tv network skirted the law to broadcast music over tv, lamp let people select a playlist to play a fuck you to DMCA no one uses lamp anymore the CD changers are still there you can reach right in and press buttons, except there is a lock lock there because insurance, insurance required two points of security - the outer door and the silly padlock any problem with the sprinkler? - water? In a machine room? (gasp) water is better for fires than halon which will kill you Servers: we have a lot of servers Talk about what’s interesting instead of any particular logical order multics: a sun server that is purple sun had three eras of computers - beige, purple, and silver purple = kinda old named after multics - one of the first multi user systems - doesn't run multics, runs solaris has been on continuously since achernya was a freshman, server has been on for at least two undergrad generations - survived the several power outages and machine room heat disasters - "athinfo multics uptime" to figure out how long it’s been up - running 4 peoples barnowls - one of the benefits of membership , can ask for a login on it, send email to multics maintainers charon - only 150 day uptime, Basically the twin of multics except it crashed before other two purple servers bonfire of the manatees (BOTTOM) it needs to die same as the 4u ones it is one of the AFS backup hasn’t changed because no one knows how to do it {{SOME OTHER SERVER I DON’T REMEMBER}} a better multics that can handle more than 4 barn owls primary-key.mit.edu foreign-key.mit.edu 1tb ssd received from csail, nikolai is the sipb faculty sponsor wanted to do homeomorphic data encryption AFS - servers: arsenic hall used to be a scripts server got in 2011 beefiest servers we ever got we have 5 of them scripts servers are now in IS&T’s vimwarey stuff scripts vms are somewhere in NJ or boston sql is here and load balancers are still here limekiller uninteresting machine a sun, but not beige or silver or purple sun made one line of servers that were "black" still has a floppy drive it is a ipv6 router MIT has every ip address that starts with 18 MIT predates the internet MIT help created the internet every ip address with 18 is MIT Example: every one that is 17 is apple Jeff Schiller asked ARIN (American Registry of Internet Numbers) for IPv6s - ARIN wanted 18 back, Jeff said NO - sipb wanted ipv6 - we have a bunch of v6s - you need a AS number, mit also picked and AS number of 3 Maybe because MIT is obsessed with PI (3.1415..) Maybe because kerberos has 3 heads too whatever variation of that story you want to tell, just be interesting - SIPB "can we announce MIT ipv6 on 3" Jeff: “sure!” - google has 15169 LOL - MIT and ARIN, IS&T will actually work with ARIN - limekiller actually broadcasts a different number, no one remembers what it is though sentry no one knows about some sort of information processy thingy the woman on the turtle story: woman says world is on the backs of four elephants, which are on the back of four turtles “It’s turtles all the way down” The guy might be richard feynman? twilight zone - xvm dev server What is xvm? press button to get your own virtual machines xvm is now in w91 this machine is a hypervisor for four more machines that are hypervisor for four more machines each - turtle story somehow involved senator bedfellow - connected to “bloom beacon” - disk tray - 18 9 gigabyte disk tray on raid 0 {{not sure what the original words were around this?}} Meaning if raid fails you lose your data - usenet the thing people used before google groups existed an email mailing thing mandalay bay xkcd the one about virus aquarium we have a virus aquarium running windows xp browses every sketchy link it get IS NOT INFECTED either no one targets it anymore or the shit on it is so bad that no can detect it sipb-noc used to be christmas tree to notice when things are broken it blinks like crazy {{I think?}} some switches debathena arm build servers people trying to bring solaris back make linux athena run on solaris - kernel panic accidentally pressed enter and the thing actually worked only one of the cpus actually panicked Moral of the story: don’t run linux on a spark dename Used by andersc for pgp trust things last rack is the least interesting A sipb vpn so people can maintain stuff without going into the machine room also linerva solaris.dialup servers linux dialup everyone was using linerva was the second largest afs client in the world largest was scripts ran a bunch of barn owls it got burnt out because everyone used it kicked everyone off and reinstalled as a vm got is&t to run dialup {{I think?}} some old scripts maintainers pressed control alt delete to do a scripts thing, broke linerva blade servers if you have a project idea that needs storage we got you fam. newest vps Thingy (cable) you can connect to the kvm with they are pretty great if you have a server rack turn around, there is a pikachu it watches over the machine room, belongs to Garry who is old SIPB member, now IS&T He will get mad at you for touching it applesauce from la verde’s, at least a decade old Like Random Hall, we also keep really old food Also fruit snacks that are really hard and peanuts that seemed to have vacuum sealed themselves THERE ARE ACTUAL TERMINALS HERE TOO *returns to the sipb office*