David Hedley's Tech Talk -- Redundancy
- 1. David Hedley’s Tech Talks Redundancy Making failure something less than an emergency. © 2018 David M. Hedley All Rights Reserved.
- 2. David Hedley’s Tech Talks – Redundancy • Specific brands and models are for illustration purposes only. • They do not imply any endorsement by the vendor, in any way. • I only include equipment that I have experience with. • At the time of writing, I have not received any compensation, or inducement from any vendor. © 2018 David M. Hedley All Rights Reserved.
- 3. David Hedley’s Tech Talks – Redundancy • Definition • Engineering (of a device, circuit, computer system, etc.) having excess or duplicate parts that can continue to perform in the event of malfunction of some of the parts. – Dictionary.com © 2018 David M. Hedley All Rights Reserved.
- 4. David Hedley’s Tech Talks – Redundancy Logical AND F T F F F T F T Logical OR F T F F T T T T © 2018 David M. Hedley All Rights Reserved.
- 5. David Hedley’s Tech Talks – Redundancy • Purpose: Making failure something less than emergency. • Question: Is there anything in the current configuration that, if it fails, will take down my customer? © 2018 David M. Hedley All Rights Reserved.
- 6. David Hedley’s Tech Talks – Redundancy • Triple Constraints • Time • Quality or Scope • Money © 2018 David M. Hedley All Rights Reserved.
- 7. David Hedley’s Tech Talks – Redundancy • Power • Utility Power only • Uninterruptible Power Supply (UPS) • UPS + Generator • UPS + Utility Power © 2018 David M. Hedley All Rights Reserved.
- 8. David Hedley’s Tech Talks – Redundancy • Power • Utility Power only • IF you have redundant power supplies, don’t plug them in to the same breaker! • Uninterruptible Power Supply (UPS) • Make sure you monitor your UPS AND run regular self tests! • UPS + Generator • UPS + Utility Power • Half or your power supplies may not be protected from surge currents. © 2018 David M. Hedley All Rights Reserved.
- 9. David Hedley’s Tech Talks – Redundancy • Power (we’re not done) • Do you know if your batteries are still good? • If the room gets too hot, will your UPS shutdown? • Are all your power supplies on the same breaker? • Do I have redundant Power Distribution Units (PDU’s)? • Did I spread the load across the breakers on the UPS or PDU? • Does my device have redundant power supplies? • Is my power cable secured? • Is my UPS sized right? http://www.apc.com/tools/ups_selector/pso/zones/ • Do I have enough power for all my Power over Ethernet (PoE) devices? © 2018 David M. Hedley All Rights Reserved.
- 10. David Hedley’s Tech Talks – Redundancy Cisco Power Stack Introduced with the Catalyst 3750X Includes the Catalyst 3650, 3850, and 9300 series Stack members are connected via Power Stack cables. https://www.cisco.com/c/en/us/td/docs/swit ches/lan/catalyst3850/hardware/installation /guide/b_c3850_hig/b_c3850_hig_chapter_0 10.html © 2018 David M. Hedley All Rights Reserved.
- 11. David Hedley’s Tech Talks – Redundancy Liebert MicroPOD • Make sure all the cables are properly connected! • What if the cables aren’t long enough? • https://www.vertivco.com/globalassets/p roducts/critical-power/uninterruptible- power-supplies-ups/liebert-micropod- maintenance-bypass-and-output- distribution-accessory/liebert-micropod- brochure.pdf © 2018 David M. Hedley All Rights Reserved.
- 12. David Hedley’s Tech Talks – Redundancy • Network – if one is good, two are better! • Is the Server Remote Access iLo, DRAC, etc., cabled and configured? • If I have more than 1 NIC port, do they connected to different blades, stack members, or switches? • Are the NIC’s teamed? • If the switch is stackable, are both stack ports connected? • Does each switch have at least 2 physical uplinks to the cores, distribution, router, etc.? © 2018 David M. Hedley All Rights Reserved.
- 13. David Hedley’s Tech Talks – Redundancy • Network – cont. • Wherever possible are we using Port-Channels (EtherChannels)? • Redundancy, Layer 2 vs Layer 3 • Is Spanning Tree mode rapid? • Where needed, has the Hot Standby Router Protocol been configured on VLAN interfaces? • Cisco Virtual Switch System (VSS) • Cisco Nexus © 2018 David M. Hedley All Rights Reserved.
- 14. David Hedley’s Tech Talks – Redundancy Network Design Simplest Network (Layer 2 Switch) • If the VLAN interfaces are on the router, ALWAYS build as a trunk port! • Are you using media-type auto-failover? • If this is a stack, do you have redundant links connected to different stack members? • Did you configure a backup interface? • Declare the backup interface. • Build the sub-interfaces on the backup interface © 2018 David M. Hedley All Rights Reserved.
- 15. David Hedley’s Tech Talks – Redundancy Network Design Simplest Network (Layer 3 Switch) • Do you have at least 2 uplinks for the switch to the router? • If this is a stack, do you have redundant links connected to different stack members? • Do you have ip multicast multipath configured? © 2018 David M. Hedley All Rights Reserved.
- 16. David Hedley’s Tech Talks – Redundancy Network Design Simplest Network (Layer 3 Switch) • Are you using a port-channel between the switches? • Are you using diverse carriers? • Are the carries using diverse paths? © 2018 David M. Hedley All Rights Reserved.
- 17. David Hedley’s Tech Talks – Redundancy • Other considerations • If you have a secondary data center, do you know how to bring services online, or move them from the primary? • Do you have your clients configured to point to DNS servers, which are located in the same facility? • Do you have redundant DHCP servers? • Are they local to the sites? • If at the data centers, are they spread across the primary and backup datacenter? • Are the DHCP servers setup for failover? © 2018 David M. Hedley All Rights Reserved.
- 18. David Hedley’s Tech Talks – Redundancy • Other considerations (cont.) • If your WAN links are down, do you have the right services onsite to continue working? • What things can’t be duplicated? • Credit Card Processing? • How much is this outage costing us? © 2018 David M. Hedley All Rights Reserved.
- 19. David Hedley’s Tech Talks – Redundancy • Thanks for watching! • You can subscribe to my YouTube Channel https://www.youtube.com/channel/UCZ3pcIh5Zmbp3rdjhfR7BOg • You can follow me on Facebook https://www.facebook.com/david.hedley.940 • You can follow me on Twitter @David_M_Hedley • Or connect with me on Linkedin https://www.linkedin.com/in/david- hedley-541985/ • You can suggest topics in the comments! © 2018 David M. Hedley All Rights Reserved.