VMWare image backup - change-blocks sertors

Hi,

Can somebody help me to underspend behavior of backup big VM on VMware image level.

We recently reset CBT for VMs which size is more 127Gb (http://www.veeam.com/kb1940)

So the logs after the first backup showed that only sectors <=4194304 have been changed and backuped. But the next backup shows another picture. As result for the fist backup %New data was much bigger.

What do these records mean?

1st backup:

2014-12-10 07:16:50 avvcbimage Info <17792>: Wrap-Up Stats:

Disk Number 2000:

  Completed(MB) Perf(MB/min) Duration

  VDDK-IO: 40960.00 27006.6 00:01:31

  Output-IO: 40960.00 5425.2 00:07:33

  Total-IO: 40960.00 3976.7 00:10:18 (+00:00:00 idle/loading/preparing)

  Extent statistics: (Change-Blocks)

  sectors <= 8: 0 0.00%

  sectors <= 16: 0 0.00%

  sectors <= 32: 0 0.00%

  sectors <= 64: 0 0.00%

  sectors <= 128: 0 0.00%

  sectors <= 256: 0 0.00%

  sectors <= 512: 0 0.00%

  sectors <= 1024: 0 0.00%

  sectors <= 2048: 0 0.00%

  sectors <= 4096: 0 0.00%

  sectors <= 8192: 0 0.00%

  sectors <= 16384: 0 0.00%

  sectors <= 32768: 0 0.00%

  sectors <= 65536: 0 0.00%

  sectors <= 131072: 0 0.00%

  sectors <= 262144: 0 0.00%

  sectors <= 524288: 0 0.00%

  sectors <= 1048576: 0 0.00%

  sectors <= 2097152: 0 0.00%

  sectors <= 4194304: 20 100.00%

  Disk Number 2001:

  Completed(MB) Perf(MB/min) Duration

  VDDK-IO: 1433600.00 25418.4 00:56:24

  Output-IO: 1433600.00 6906.7 03:27:34

  Total-IO: 1433600.00 4729.3 05:03:08 (+00:00:00 idle/loading/preparing)

  Extent statistics: (Change-Blocks)

  sectors <= 8: 0 0.00%

  sectors <= 16: 0 0.00%

  sectors <= 32: 0 0.00%

  sectors <= 64: 0 0.00%

  sectors <= 128: 0 0.00%

  sectors <= 256: 0 0.00%

  sectors <= 512: 0 0.00%

  sectors <= 1024: 0 0.00%

  sectors <= 2048: 0 0.00%

  sectors <= 4096: 0 0.00%

  sectors <= 8192: 0 0.00%

  sectors <= 16384: 0 0.00%

  sectors <= 32768: 0 0.00%

  sectors <= 65536: 0 0.00%

  sectors <= 131072: 0 0.00%

  sectors <= 262144: 0 0.00%

  sectors <= 524288: 0 0.00%

  sectors <= 1048576: 0 0.00%

  sectors <= 2097152: 0 0.00%

  sectors <= 4194304: 700 100.00%

  Disk Number 2002:

  Completed(MB) Perf(MB/min) Duration

  VDDK-IO: 1638400.00 26054.6 01:02:53

  Output-IO: 1638400.00 4531.2 06:01:35

  Total-IO: 1638400.00 3428.1 07:57:56 (+00:00:00 idle/loading/preparing)

  Extent statistics: (Change-Blocks)

  sectors <= 8: 0 0.00%

  sectors <= 16: 0 0.00%

  sectors <= 32: 0 0.00%

  sectors <= 64: 0 0.00%

  sectors <= 128: 0 0.00%

  sectors <= 256: 0 0.00%

  sectors <= 512: 0 0.00%

  sectors <= 1024: 0 0.00%

  sectors <= 2048: 0 0.00%

  sectors <= 4096: 0 0.00%

  sectors <= 8192: 0 0.00%

  sectors <= 16384: 0 0.00%

  sectors <= 32768: 0 0.00%

  sectors <= 65536: 0 0.00%

  sectors <= 131072: 0 0.00%

  sectors <= 262144: 0 0.00%

  sectors <= 524288: 0 0.00%

  sectors <= 1048576: 0 0.00%

  sectors <= 2097152: 0 0.00%

  sectors <= 4194304: 800 100.00%

  Aggregate:

  Completed(MB) Perf(MB/min) Duration

  VDDK-IO: 3112960.00 25766.0 02:00:49

  Output-IO: 3112960.00 5397.7 09:36:43

  Total-IO: 3112960.00 3933.6 13:11:23

2nt backup:

2014-12-10 18:24:55 avvcbimage Info <17792>: Wrap-Up Stats:

Disk Number 2000:

  Completed(MB) Perf(MB/min) Duration

  VDDK-IO: 1747.00 3882.2 00:00:27

  Output-IO: 1747.00 627.7 00:02:47

  Total-IO: 40960.00 11325.3 00:03:37 (+00:00:00 idle/loading/preparing)

  Extent statistics: (Change-Blocks)

  sectors <= 8: 0 0.00%

  sectors <= 16: 0 0.00%

  sectors <= 32: 0 0.00%

  sectors <= 64: 0 0.00%

  sectors <= 128: 703 36.00%

  sectors <= 256: 452 23.00%

  sectors <= 512: 225 11.00%

  sectors <= 1024: 167 8.00%

  sectors <= 2048: 88 4.00%

  sectors <= 4096: 166 8.00%

  sectors <= 8192: 56 2.00%

  sectors <= 16384: 27 1.00%

  sectors <= 32768: 9 0.00%

  sectors <= 65536: 6 0.00%

  sectors <= 131072: 4 0.00%

  sectors <= 262144: 3 0.00%

  sectors <= 524288: 2 0.00%

  sectors <= 1048576: 0 0.00%

  sectors <= 2097152: 0 0.00%

  sectors <= 4194304: 0 0.00%

---------------------------------------------------------

  Disk Number 2001:

  Completed(MB) Perf(MB/min) Duration

  VDDK-IO: 931.00 3724.0 00:00:15

  Output-IO: 931.00 980.0 00:00:57

  Total-IO: 1433600.00 1048975.6 00:01:22 (+00:00:00 idle/loading/preparing)

  Extent statistics: (Change-Blocks)

  sectors <= 8: 0 0.00%

  sectors <= 16: 0 0.00%

  sectors <= 32: 0 0.00%

  sectors <= 64: 0 0.00%

  sectors <= 128: 0 0.00%

  sectors <= 256: 0 0.00%

  sectors <= 512: 0 0.00%

  sectors <= 1024: 0 0.00%

  sectors <= 2048: 463 81.00%

  sectors <= 4096: 63 11.00%

  sectors <= 8192: 16 2.00%

  sectors <= 16384: 8 1.00%

  sectors <= 32768: 10 1.00%

  sectors <= 65536: 3 0.00%

  sectors <= 131072: 2 0.00%

  sectors <= 262144: 0 0.00%

  sectors <= 524288: 0 0.00%

  sectors <= 1048576: 0 0.00%

  sectors <= 2097152: 0 0.00%

  sectors <= 4194304: 0 0.00%

---------------------------------------------------------

  Disk Number 2002:

  Completed(MB) Perf(MB/min) Duration

  VDDK-IO: 10379.00 4207.7 00:02:28

  Output-IO: 10379.00 1098.3 00:09:27

  Total-IO: 1638400.00 122573.6 00:13:22 (+00:00:02 idle/loading/preparing)

  Extent statistics: (Change-Blocks)

  sectors <= 8: 0 0.00%

  sectors <= 16: 0 0.00%

  sectors <= 32: 0 0.00%

  sectors <= 64: 0 0.00%

  sectors <= 128: 0 0.00%

  sectors <= 256: 0 0.00%

  sectors <= 512: 0 0.00%

  sectors <= 1024: 0 0.00%

  sectors <= 2048: 4,659 78.00%

  sectors <= 4096: 771 13.00%

  sectors <= 8192: 234 3.00%

  sectors <= 16384: 113 1.00%

  sectors <= 32768: 84 1.00%

  sectors <= 65536: 23 0.00%

  sectors <= 131072: 13 0.00%

  sectors <= 262144: 6 0.00%

  sectors <= 524288: 0 0.00%

  sectors <= 1048576: 0 0.00%

  sectors <= 2097152: 0 0.00%

  sectors <= 4194304: 0 0.00%

---------------------------------------------------------

  Aggregate:

  Completed(MB) Perf(MB/min) Duration

  VDDK-IO: 13057.00 4101.7 00:03:11

  Output-IO: 13057.00 990.4 00:13:11

  Total-IO: 3112960.00 169336.0 00:18:23

---------------------------------------------------------

Thanks!