Avamar backup performance of winclusterfs plug-in backup is poor after upgrading from 7.0 to 7.2

Summary: Avamar backup performance of winclusterfs plug-in backup is poor after upgrading from 7.0 to 7.2.

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Symptoms

The Avamar winclusterfs plug-in is used to back up data on a share. Versions from 7.2 onward show markedly lower performance for the same dataset, even where the same node always owns the disk.

Below is a comparison of how the backup performs for different versions.

v7.3.100-233:

2016-10-05 10:50:05 avtar Info <5156>: Backup #189 timestamp 2016-10-05 10:50:05, 115,807 files, 11,387 folders, 18.03 GB (88 files, 2.336 MB, 0.01% new)
2016/10/05-08:50:05.04600 [avtar]  backup expire prectime=131202155790000000
2016-10-05 10:50:05 avtar Info <7539>: Label "MOD-1475655580409#1", scheduled to expire after 10/06/16 (2016-10-06 08:19:39 UTC), none backup, backup type: level0_full
2016-10-05 10:50:05 avtar Info <6083>: Backed-up 18.03 GB in 30.35 minutes: 36 GB/hour (228,956 files/hour)

Avamar 7.2.101-32_HF254688:

2016-10-03 10:22:20 avtar Info <5156>: Backup #179 timestamp 2016-10-03 10:22:21, 115,587 files, 11,386 folders, 18.02 GB (222 files, 2.467 MB, 0.01% new)
2016/10/03-08:22:20.70300 [avtar]  backup expire prectime=131200408610000000
2016-10-03 10:22:20 avtar Info <7539>: Label "MOD-1475480862127#1", scheduled to expire after 10/04/16 (2016-10-04 07:47:41 UTC), none backup, backup type: level0_full
2016-10-03 10:22:20 avtar Info <6083>: Backed-up 18.02 GB in 34.58 minutes: 31 GB/hour (200,536 files/hour)


v7.0.102-47: 

2016-10-03 10:36:46 avtar Info <5156>: Backup #180 timestamp 2016-10-03 10:36:46, 115,573 files, 11,384 folders, 18.02 GB (81 files, 8,158 GB, 45284.56% new)
2016/10/03-08:36:46.44700 [avtar]  backup expire prectime=131200433480000000
2016-10-03 10:36:46 avtar Info <7539>: Label "MOD-1475483348319#1", scheduled to expire after 10/04/16 (2016-10-04 08:29:08 UTC), none backup, backup type: level0_full
2016-10-03 10:36:46 avtar Info <6083>: Backed-up 18.02 GB in 7.58 minutes: 143 GB/hour (915,385 files/hour)

 

Cause

In the Avamar v7.2 code, the scanning process was changed. Extra security checking steps were added to the backup. 

These security enhancements result in slower backup performance.

Resolution

If the reduced performance is unacceptable, the following flag can be added to the avtar.cmd file (in the avsar directory) to skip all reparse point handling:

--x31=+33554432

This flag should be handled with care, and used only if there are no reparse points in the dataset.

 

Affected Products

Avamar

Products

Avamar, Avamar Client for Windows
Article Properties
Article Number: 000063674
Article Type: Solution
Last Modified: 16 Apr 2025
Version:  4
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