iSCSI is more operating system compatibility then Splunk. Its really just another drive.
As Splunk goes its all about IOPS.
Here is another post that I found on this.
link:(http://www.splunk.com/support/forum:SplunkAdministration/3206"iSCSI")
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There is a Splunk app for exchange, but as far as monitoring a straight SMTP queue, you could use WMI to get the values, then graph them in Splunk. That is what I did.
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