<div>
Event ID and Source of the posted info, please.<br />
What version of Exchange server you're trying to backup?<br />
Post the results of:<br />

<pre><code class="code-1 nolinks" id="code-20-42410610-1"><span>Get-Command ExSetup | ForEach {$_.FileVersionInfo} </span>
</code></pre>
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<blockquote>
Event ID and Source of the posted EVENT ENTRY, please.
</blockquote>
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As per error reported in event viewer.( attached-capture2.png)<br />
<br />
I ran following on EMS:<br />
<br />
Didn’t find any issue with vssadmin list writers . In our case, the VSS writers were fine.<br />
<br />
Typed: vssadmin list providers . This will show the VSS writers capable of taking a system snapshot when backing.<br />
Next typed: disk shadow &nbsp;. Once that comes up typed: &nbsp;list providers . &nbsp;one will now see the hardware ID for each VSS writer that you have. <br />
<br />
Took note of what VSS error said in your event log. For mine I noticed that a VSS writer with the ID of { 819e044d3..} was giving lots of errors. I matched up the ID number of the event log to the ID number of command prompt output. I noticed that the HW Provider was the culprit<br />
<br />
My question is do we really require that writer from Commvault perspective?
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event ID 13 and event ID 12292
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<div class="content wysiwyg-content">
we are experiencing vss backup failures on exchange servers which are having passive copies of databases.<br />
<br />
attached errors. <br />
<br />
but when we rebooted the server, backups were successful but the errors )attached still shows<br />
<br />
any clue how rebooting got it corrected even if the error shows<br />
<a href="https://filedb.experts-exchange.com/incoming/2017/12_w51/1216046/vss1.png" target="_blank" class="file-inline" title="vss (2 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>vss1.png</a><br />
<a href="https://filedb.experts-exchange.com/incoming/2017/12_w51/1216047/Capture2.png" target="_blank" class="file-inline" title="vss error (1 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>Capture2.png</a>
</div>
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vss1.png

Capture2.png

we are experiencing vss backup failures on exchange servers which are having passive copies of databases.

attached errors. 

but when we rebooted the server, backups were successful but the errors )attached still shows

any clue how rebooting got it corrected even if the error shows

EXCHANGE 2010 DAG

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

The term "Backup" means the methods and processes involved to copy computer data (system data as well as application data) to media other than the ones where the data originally live (disk, tape, optical, cloud). "Restore" in turn means the methods and processes involved in data recovery, i. e., bringing back copied computer data to their original location. Backup/Restore primarily serves as a means of protection against data loss, be it due to disaster, corruption or sabotage. It can also be used for recovering data from an earlier point in time and even for cloning machines or applications. There is a wide variety of backup/restore software available, from expensive commercial products to free or open source tools.

Storage Software

Databases are organized collections of data, most commonly accessed through management systems including schemas, tables, queries and processes that allow users to enter and manipulate the information or utilize it in other fashions, such as with web applications or for reporting purposes.