Síťové prvky SIN on Sincoolka status page

[Resolved] Vypínáme prvky kvůli extrémnímu teplu

Sun, 28 Jun 2026 14:12:00 +0200

29.6. okolo 21:00 opět vše zapnuto / everything works again.

Kabelové připojení na většině 7. a 8. chodby (pokoje 45-65) je dočasně přerušeno z důvodu extrémního tepla a ochrany našeho vybavení. Wi-Fi by měla fungovat normálně. Snad jej budeme moci opět večer zapnout.

Due to extreme heat, cable connection was temporarily shut down for most of 7th and 8th corridor (rooms 45-65) to prevent equipment damage. Wi-Fi should function fine. We hope that we can turn it back on in the evening.

[Resolved] Víkendové práce / Weekend maintenance

Sat, 07 Feb 2026 11:25:00 +0100

Jedeme víkendovku. Očekávejte výpadky napříč všemi systémy.
Zejména očekávejte výpadky Wi-Fi a kabelu na 7. a 8. chodbě, kde dojde k pokusu o opravu switche.

We are doing “a weekend shift”. Expect outages across all of our systems.
A notable outage will occur at corridors 7 and 8, where we will attempt to repair and upgrade a switch housing the Wi-Fi access points.

[Resolved] Firmware update (SIN 13th, 14th corridor)

Sun, 21 Dec 2025 01:00:00 +0100

Maintenance - Na 13. a 14. chodbě bude docházet k aktualizaci firmwaru switchů, a to v době od 2:00 do 3:30 ráno. Nejprve dojde k dočasnému odpojení kabelového připojení, posléze Wi-Fi, a to zhruba na 10-20 minut.

Maintenance - On 13th and 14th corridor, switch firmware will be updated from 2:00am to 3:30am. First, cable connection will be temporarily interrupted, then Wi-Fi, for periods of approx. 10-20 minutes.

[Resolved] Services offline (internet resolved)

Wed, 14 May 2025 11:28:00 +0000

Update 15.5. 19:15: All of the services have been restored and are running again. Unfortunately we have lost data from 2025-05-14 4am to approx 13:17 due to the last backup being at approx. 4am of that day. This also concerns e-mails. If you were expecting an important e-mail, please check if you have received it, and ask the sender to resend, if necessary.
We will implement replication across the VM cluster on the critical services to prevent such major data loss in the future; the backups will also be performed more often.

16:10 SINIS and websites should be online, albeit a bit slower now due to DNS resolving only half-functional. All changes performed from 4am have been lost for the time being. The secondary DNS resolver is working but the primary is being restored; once that is up, operations should speed up significantly. E-mail restore will also be performed in the evening hours to recover e-mails sent/received from approx 4am to 1pm.

14:39 Connectivity should be up now; if not, please disable and then reconnect your Wi-Fi, or disconnect and reconnect your network cable. Other services will take longer to restore.

The internet is currently down because of a critical server drive malfunction. We are currently trying to restore the systems from backup but it might take time. Thank you for bearing with us.

E-mails @sin.cvut.cz are also down! Please, do not e-mail admin (at) sin.cvut.cz at this moment. We will only receive your messages once the services are back up, and the message delivery might be delayed by a few hours.

[Resolved] Plánovaná odstávka - 2am

Wed, 23 Mar 2022 01:00:00 +0000

Plánovaná odstávka - V noci 23. 3. v 02:00-03:30 proběhne upgrade firmware switchů, v důsledku čehož bude krátkodobě vyřazeno připojení k síti na Sinkuleho i Dejvické koleji.

Planned downtime - We will upgrade the switch firmware during the night of March 23 from 02:00 to approx. 03:30. Both cable connections and Wi-Fi will be down on both Sinkuleho and Dejvická dormitories.

[Resolved] Reconnection to UPS

Sat, 10 Jul 2021 20:43:52 +0000

UPS reconnection - Corridors 11-14 will be disconnected for approx. 15 minutes due to a UPS reconnection.

[Resolved] Switch down, rooms SIN 45–65

Mon, 21 Jun 2021 10:38:57 +0000

13:52 - The issue was caused by a misbehaving optical transciever in the core switch, which we replaced. Soon the network should become stable again.

12:38 - Investigating - Switch is down at 7th corridor of Sinkuleho, rooms 45-65 have no working cable connection. We are investigating the root cause.

[Resolved] Downtime – firmware (up/down)grade

Sat, 01 May 2021 23:55:00 +0000

Scheduled Downtime - Plánovaný výpadek

Počátek: 2021-05-01, cca od 01:55 GMT+2
Trvání: cca 30 minut

Upgraduji, resp. downgraduji firmware na switchích. Na všech najednou.
(Mohl jsem říct, že sjednocuji. Možná příště.)

I will be upgrading, or downgrading, the firmware version of our network appliances. All at once.
(I could have said that I am unifying them. For the aesthetic effect, anyway.)

[Resolved] Outage – Switch upgrade (SIN, corridors 13-14)

Fri, 18 Dec 2020 21:00:53 +0000

Outage - We are finally replacing some old 3com switches, which power the cable connection for the whole 13th and 14th corridors.

From 10pm today, the cable internet will be off for approx. 15-30 minutes while we exchange the boxes.

Wi-Fi should work fine throughout the outage.

Thanks for your patience.

[Resolved] Core switch upgrade – network disruption

Sun, 15 Nov 2020 16:05:59 +0000

Downtime - Asi na 15 minut vypadne připojení k síti v důsledku upgradu softwaru na core switchi. Dělali jsme ISSU upgrade, který sice proběhl, ale nemám z něj dobrý pocit, proto po nějaké době provedu opět reset. Lze očekávat nedostupnost všech služeb.

Downtime - There’s going to be approx 15 minutes outage in the best scenario, due to a software upgrade of a core switch in the network. All our network services will be unreachable, except for status.sin.cvut.cz.

[Resolved] Výměna větráčků vol. 4 / Fan replacement No. 4

Fri, 28 Aug 2020 15:00:30 +0000

Odstávka / Downtime - Friday 28. 8. 2020, 17:00-19:00

Ztišování studoven, ale budeme k tomu potřebovat pár odstávek. Výpadky očekávejte na Sinkulce, na:

kabelu, na pokojích 77-109 a ve studovnách na 9. chodbě
Wi-Fi na 9., 10. chodbě,

a to cca na dobu 45 minut až 1 hodiny pro každou zasaženou oblast.

EN: We’ll be again making our study rooms at Sinkuleho more quiet, but we will need downtimes. Starting at 5pm, ending just before 7pm, hopefully. This is what will be affected:

Cable, rooms 77-109, study rooms in corridor 9,
Wi-Fi in corridors 9, 10,

and the outages will take around 45-60 minutes for each area where we do the work.

[Resolved] Výměna větráčků vol. 3 / Fan replacement No. 3

Wed, 26 Aug 2020 17:00:00 +0000

Update 20:35 - vše plně funkční, oproti původním plánům jsme dělali pouze 11. a 12. chodbu / everything operational, there was a slight deviation from the plan - we have only done corridors 11 and 12 tonight

Odstávka / Downtime - 26. 8. 2020, 19:00-21:00

Opět proběhne větší ztišování studoven, ale budeme k tomu potřebovat pár odstávek. Výpadky očekávejte na Sinkulce, na:

kabelu, na pokojích 110-142 a ve studovnách na 11. chodbě
Wi-Fi na 11., 12. chodbě,

a to cca na dobu 45 minut až 1 hodiny pro každou zasaženou oblast.

EN: We’ll be again making our study rooms at Sinkuleho more quiet, but we will need downtimes. Starting at 7pm, ending just before 9pm, hopefully. This is what will be affected:

Cable, rooms 110-142, study rooms in corridor 11,
Wi-Fi in corridors 11, 12,

and the outages will take around 45-60 minutes for each area where we do the work.

[Resolved] Výměna větráčků vol. 2 / Fan replacement No. 2

Mon, 17 Aug 2020 17:00:00 +0000

Odstávka / Downtime

Tentokrát řízneme do druhého switche na 7. chodbě. Začneme kousek po 7. hodině večerní a skončíme snad před úředkami. :-) Nepojede:

Sinkulka, kabel na pokojích 45-65

Wi-Fi by vypadávat neměla, ale kdyby náhodou…

EN: We’ll be replacing fans in the second switch at 7th corridor. Starting at 7pm, ending just before 8pm, hopefully. Cable will be out for:

Sinkuleho, rooms 45-65

Wi-Fi should stay fine, but never say never…

[Resolved] Práce na switchi / Switch maintenance

Fri, 31 Jul 2020 18:00:00 +0000

ONLINE 21:22 - Dokončili jsme výměnu větráku a nyní budeme stav pozorně sledovat. | Switch maintenance complete. We will monitor the switch status now.

Offline - Zkusíme něco udělat s hlučnými switchi, které si momentálně chováme v našich studovnách - vyměníme jim větráky. Dneska bychom začali na 7. chodbě a když to pomůže, rozšíříme kůru i na další patra. Již teď víme, že třeba na 5. chodbě bychom měli problém s chlazením a proto to budeme muset vyřešit jinak, ale studovny na 7., 9. a 11. chodbě by již brzy měly být znovu použitelné.

V průběhu odstávky, cca od 20 do 21h, nebude fungovat:

Wi-Fi AP na 7. a 8. chodbě
kabelové připojení na pokojích SIN 44, 66-76

EN - We will try to deal with our loud network switches, which are currently whining in the left study rooms in the odd corridors. We’re going to exchange their fans. Today we’ll begin with the 7th corridor and if successful, the others will follow. Currently we know that the heat dissipation in 5th corridor will be a challenge and we’ll have to think about a different solution. At the end, 7th, 9th and 11th corridors should be good to study in.

The maintenance, from 8-9pm, will affect the following

Wi-Fi AP in 7th, 8th corridors
cable connection in rooms SIN 44, 66-76

(image and walkthrough credit: https://www.reddit.com/r/Juniper/comments/esulh7/fan_swap_notes_for_ex2300/)

[Resolved] Výpadek - firmware upgrade

Sat, 18 Jul 2020 00:10:00 +0000

Downtime - dojde k aktualizaci firmware některých našich switchů, čímž se nám otevře např. Streaming Telemetry pomocí gRPC na našich access switchích. Tím budeme schopni sbírat data o provozu v reálném čase.

Zatím testujeme na omezeném okruhu switchů.

Výpadek se týká části 7. a 8. chodby a všech Wi-Fi AP na 7. a 8. chodbě Sinkuleho koleje.