Exchange Backup failing with VSS error (4033582)

Exchange backups fail with VSS error in binary logs, also logging error in Event Viewer on the Exchange node.

The NV Binary logs will not give much info other than showing it is a VSS error, but when looking at the Event Logs on the Exchange node to diagnose, we see the following:

Log Name:      Application
Source:        EqualLogic
Date:          12/5/2013 10:52:26 AM
Event ID:      4002
Task Category: VSS
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      test.net
Description:
Error 0x80070490 opening SNMP connection to \\.\PHYSICALDRIVE2 (0-1cb196-eec76a056-55b0000001952495).
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="EqualLogic" />
    <EventID Qualifiers="49154">4002</EventID>
    <Level>2</Level>
    <Task>3</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2013-12-05T09:52:26.000000000Z" />
    <EventRecordID>1363924</EventRecordID>
    <Channel>Application</Channel>
    <Computer>test.net</Computer>
    <Security />
  </System>
  <EventData>
    <Data>0x80070490</Data>
    <Data>\\.\PHYSICALDRIVE2</Data>
    <Data>0-1cb196-eec76a056-55b0000001952495</Data>
  </EventData>
</Event>

The event error above was happening at the exact same time as the Exchange Backup had failed on schedule.

We found that the cause of this was that Dell Equalogic AutoSnapshot Manager was also running at the same time, causing this VSS conflict.

If the Dell EqualLogic Auto Snapshot Manager cannot be disabled, the make sure the schedule is changed to not run during the NetVault Backup window on the affected machine.