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IRIS

Instructional & Research Information Systems

DNS

Domain Name Service

rhea down time – no NIS, time or DNS service Tuesday April 24, 2018 7:15am-7:45am

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rhea will not be providing NIS, time and DNS services starting at 7:15 am Tuesday April 24, 2018.

A new server will become rhea shortly after 7:15 am.
This upgrade is similar to the cronus upgrade last month.

Though the scheduled downtime is 7:15am to 7:45am, we expect actual downtime to be less. Devices should be able to use
cronus for NIS, time and DNS services while rhea is down.

If you have any questions or notice any issues, please contact help@eecs aka the IRIS help desk (395 Cory M-F 9:30am-5pm, 642-7777)
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cronus.cs remains down after neighborhood power outage

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A power outage to Soda Hall which began around 12:30pm on June 21, 2017 took out many IRIS services.

At about 3:00pm, power was restored to Soda Hall and staff are bringing up network equipment now. The power conditioner in the main Soda machine room had problems recovering, and campus electricians required additional time to get it back online. Our IRIS staff then were able to begin bringing infrastructure online, including dhcp, fileservice, DNS, etc.

By 6:50pm, most IRIS services were restored.

cronus.cs, one of our DNS and NIS servers, remains down at this time. This may cause delays or timeouts for various machines and services.

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UPS Installation/Various System Outages

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Delivery is expected Monday for our new UPS which will be installed in the 290 Soda Hall server room. Some services will be down for short periods on Tuesday while they are moved off of room power and onto temporary power. Later in the week, there will be a second outage while those machines are moved onto the new UPS. Additionally, there may be a longer outage of our storage systems while some upgrades are done.

While I realize that this post is somewhat vague, a lot depends on exactly when the UPS is delivered and how long it takes to install it. I will be posting more refined notes to narrow down the scope of what services will be out (and when) as time goes on.

While we realize that there may be some inconveniences for some, please bear with us as we strive update our services and minimize outages for the future

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Unplanned Power Outage

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There was a loss of power to both Rhea and Cronus this afternoon. Unfortunately, due to the power renovations in preparation for the new UPS installation, both servers were connected to the same power source. This will be corrected as soon as possible. We regret this inconvenience.

Resolved as of 2011-03-10 15:10:00

December 28th Shutdown

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IMAP/mail, home/project, Windows services (AD/WINS/printing), LDAP/NIS/DNS, DHCP and most other IDSG and IMG services will be affected. We will try to keep some basic network services running (DHCP, DNS/NIS), possibly in a reduced capacity.

While EECS-Secure, EECS-Guest and EECS-Open wireless LANS will be out of service during this time, the EECS and AirBears wireless LANS will remain operational during the outage.

The reason for this extended downtime is multi fold. The first is to repair the UPS that failed a couple of weeks back. The repaired unit will be placed back on line and extensive testing must be done to ensure it’s operation before we can depend on the UPS again. The second is to move data around which will allow us to remove from service a piece of software used to manage storage. This software is no longer under development and we need to remove our dependency on it. Lastly, some routine maintenance will be done which can only be done when systems are down. These are the kind of things that can only be done between semesters and we ask for you understanding during this disruption in service.

While the stated outage is from 10:00AM to 9:00PM, it may not take that long. This is a worst case scenario. If possible, services will be brought up sooner than 9:00 PM.
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Network routing & DNS disruptions

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We experienced several related network disruptions Friday afternoon. Beginning with reports at noon of DNS outages from Sutardja Dai Hall, there initially appeared to be problems with that building’s router failing to forward packets correctly. Resetting the links to the DNS service switches initially appeared to solve the issue, but additional connectivity problems between Cory and S-D were discovered later.

While following error messages generated by the primary 10Gb line card in the Cory Hall router, some wired subnets in Cory were temporarily isolated from the rest of the network and the Internet. This outage from 4:20-4:30pm occurred when the suspect line card failed to resume forwarding traffic after running diagnostics. Network staff were immediately aware of that disruption and quickly reestablished basic connectivity on a different port.

While the symptoms have been mitigated, the root cause of the outage has not been fully diagnosed and network is running without full redundancy. Network personnel are planning followup work and are actively monitoring this problem in the event that it reoccurs.
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