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Timing, Run Limits and Scan Windows

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In this lesson, you will learn:

  • How schedule time zones work
  • What max run time does
  • How SNWR fitted scans into windows

🔁 Quick look back: Last time: Quick Discovery for One Device. You learned how Quick Discovery scans one address on demand.

1 The Problem: A Scan Could Spill Into Monday Morning

SNWR Network Weekly starts Sunday 02:30 IST. If something slows it down:

  • It could still be running on Monday morning.
  • That breaks Farah’s scan window.

🎯 The problem: A slow scan could spill into business hours.

👉 The fix: Set the right time zone and a maximum run time on every schedule.

Table of schedules with time zone and limit.
Figure 1. SNWR schedules with time zones and run limits.

2 Time and time zones

A schedule runs at a time in a time zone. Set it to the site’s zone, so 01:00 means 01:00 for that site.

💡 Good to know: London changes clocks for summer time. Using the Europe/London zone handles that.

3 Max run time

Key term: Max run time

The longest a scan may run. When reached, Discovery stops the scan.

Set it inside the window with room to spare. If scans hit the limit, fix the cause instead of raising it.

4 Project Clear View: How We Implemented It

📍 Situation: Farah’s window is 22:00 to 06:00 local time.

🧭 Decision: Set each schedule’s time zone and a run limit that ends inside the window.

🛠️ Steps we took:

  1. Set Mumbai schedules to Asia/Kolkata and London to Europe/London.
  2. Put the network scan in SNWR Sunday maintenance at 02:30.
  3. Set a 3-hour limit on the big schedules.
  4. Checked each ends before 06:00.

✅ What we verified:

  • Every schedule ends inside its window.
  • Farah reviewed the times.

📁 Evidence: Times and limits recorded with the schedules. See ITSM Implementation › Change Risk › Maintenance Windows and Blackout Schedules for SNWR Sunday maintenance.

5 Quick recap

  • Set each schedule to its site’s time zone.
  • Max run time stops scans that run too long.
  • Keep limits inside the window.
  • If a scan hits its limit, fix the cause.

6 Check yourself

Think of your answer first. Then tap to check.

1 Why set London’s schedule to Europe/London? Show answer

So 01:00 is London time, including summer time changes.

2 What does max run time do? Show answer

Stops the scan when it runs too long.

3 A scan keeps hitting its limit. What do you do? Show answer

Find and fix the cause, rather than just raising the limit.

Nice work! SNWR’s scans stay in their windows. 🎉
Next up: Change Control for Schedules

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