Is there an app to monitor disk writes on a particular drive or drives?

We have 650 GB of high-availability SAN space at our data center. We just received a bill for "overage" on our SAN space usage, which was odd, because we've never had more than 650 GB of data on the drive.

After much back and forth, we've determined that they implemented a proprietary monitor which records writes to the SAN space, and have started billing for overage when you exceed 650 GB of disk WRITES rather than 650 GB of data at rest, which is how they've handled things before.

They offered no warning about the change, and gave us no advanced notice. They have no tools, no apps in their portal, and no reporting system to notify us when we are close to exceeding our monthly usage total.

I've used apps before which monitor if a disk is full, but I've never needed a tool that monitors total writes to a hard disk.

Does such a tool exist?
molonelAsked:
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Laroy ShtotlandIT Security ConsultantCommented:
You can try free standart version of SNMP Informant to use your SNMP Network Management Station (NMS) to collect disk metrics from Microsoft Windows servers and even get SNMP MIBs.
http://www.snmp-informant.com/snmp-informant-standard.htm
And of course there is a lot of special pricy enterprise solutions for that (like ManageEngine, Cloudera or Solarwinds for e.g.).
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JohnBusiness Consultant (Owner)Commented:
Try Windows Resource Monitor and use the Disk tab. It tracks disk writes (byte/second). You may be able to work out your measurement by letting resource monitor run.
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Gerald ConnollyCommented:
i think i would be looking at acquiring my own disks rather than pay this ridiculous charge.

650GB is tiny by todays standard, and would fit on what is now a small disk of 1TB, adding a mirrored set of SSD's would pay for itself in a short period of time.
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molonelAuthor Commented:
Laroy, this is what we are going with. Thank you!

All were good solutions, as always.
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