Viavi Apex Enterprise G3-APEX-ENT-32T, User Manual

Page: 246 / 380

Searching for microbursts
246 GigaStor (23 Feb 2018) — Archive/Non-authoritative version
connections.) For this reason, you will likely see fewer microbursts than when
any of the Full Duplex options are selected because the utilization threshold is
higher.
Note: The Data type option is unavailable when doing Microburst
analysis because Microburst analysis shows the number of times or
percentage of time when a microburst occurs within a duration and
utilization threshold. Because the charts show only microbursts and no
other type of information, you cannot choose to show bytes, bits or
packets for data type.
Percent of duration intervals with microbursts : The Detail Chart shows
bursts as a percentage. It uses four variables to determine the percentage.
Each bar (assuming your chart is configured to show bars instead of lines)
represents one interval. Within each slice are smaller chunks of time, which
are the durations (although they are not visible on the Detail Chart). The
percentage is calculated by:
1 Screen resolution interval
Duration
= Maximum number of intervals
2 Number of duration intervals with
microbursts
Maximum number of intervals
= Percent of interval durations with
microbursts
Number of duration intervals with microbursts : The Detail Chart shows
the count of microbursts that occurred in each duration interval. There can
only be one microburst per duration interval This number is also used to
calculate the percent of duration intervals with microbursts.
Table 8 (page 246) shows how changing one variable changes the
calculations and can affect what you see in your charts.
Table 8. Changing interval, duration, or MB Utilization
Interval
5 ms
1
,
2
,
3
Interval
200
ms1,2,3
Interval
1 s1,2,3 Duration
1
ms1,3,
4
Duration
100
µs1,3,4
Duration
10
µs1,3,4
MB
Util
10%1,2,4,
5
MB
Util
50%1,2,4
MB
Util
90%1,2,4
Bits/sec in Interval 2,500,000100,000,0005,000,000 5,000,0005,000,000 5,000,000 5,000,0005,000,0005,000,000
Bytes/sec in Interval 309,672 12,338,304 61,688,484 617,826 617,826 617,826 617,826 617,826 617,826
Bytes/sec in Interval
with IFG
319,500 12,500,000 625,000,000625,000 625,000 625,000 625,000 625,000 625,000
Megabytes/sec 0.298 11.921 59.605 0.596 0.596 0.596 0.596 0.596 0.596
# of packets/
Interval
204 8,128 40,638 407 407 407 407 407 407
Max # of
microbursts in
Interval
5 200 1,000 10 100 1,000 10 10 10
Max bits of duration
from Utilization
Threshold
500,000 500,000 500,000 500,000 50,000 5,000 500,000 500,000 500,000
# of bits per
Duration for
microburst
250,000 250,000 250,000 250,000 25,000 2,500 50,000 250,000 450,000