What is installer.failurerequests in the root directory? I just noticed a file called installer.failurerequests in my root directory:

cd /
ls
Applications/              User Information@          cores/                     installer.failurerequests  sbin/
Library/                   Users/                     dev/                       net/                       tmp@
Network/                   Volumes/                   etc@                       opt/                       usr/
System/                    bin/                       home/                      private/                   var@


It's a plist of some sort and its contents read as:

&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"&gt;
&lt;plist version="1.0"&gt;
&lt;array&gt;
    &lt;dict&gt;
        &lt;key&gt;Operation&lt;/key&gt;
        &lt;string&gt;fsck target&lt;/string&gt;
        &lt;key&gt;CrashAtProgress&lt;/key&gt;
        &lt;integer&gt;0&lt;/integer&gt;
    &lt;/dict&gt;
&lt;/array&gt;
&lt;/plist&gt;


What is that file and what it is doing in /?  I am on OS 10.11.3
It's safe to delete this file.

It is a file left behind by the OS X installer in later versions. It seems to always be there after installation, so its existence does not indicate a failure in it self.

What the installer actually uses the file for is not known to me. It might be used if the installer fails/crashes, to indicate what the installer was doing at the time of the crash - but this is guesswork.