<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">
<div class="">
<div dir="auto" style="caret-color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">
<div dir="auto" style="caret-color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">
<div dir="auto" style="caret-color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">
<div dir="auto" style="caret-color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">
<div>
<div class="ContentPasted0" style="border: 0px; font-stretch: inherit; line-height: inherit; margin: 0px; padding: 0px; vertical-align: baseline;">
<div dir="auto" class="" style="font-family: Calibri; font-size: 16px; word-wrap: break-word; line-break: after-white-space;">
This is an announcement of <span class="outlook-search-highlight"><span class="outlook-search-highlight">Varsha</span></span> <span class="outlook-search-highlight"><span class="outlook-search-highlight">Rao</span></span>'s MS Presentation<br class="">
===============================================<br class="">
Candidate: <span class="outlook-search-highlight"><span class="outlook-search-highlight">Varsha</span></span> <span class="outlook-search-highlight"><span class="outlook-search-highlight">Rao</span></span><br class="">
<br class="">
<span style="background-color: rgb(255, 255, 255);" class="">Date: Wednesday, May 15, 2024</span><br class="">
<br class="">
<span style="background-color: rgb(255, 255, 255);" class="">Time: 9:30 am CT</span><br class="">
<br class="">
<span style="background-color: rgb(255, 255, 255);" class="">Location: JCL 298</span></div>
<div dir="auto" class="" style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0); font-family: Calibri; font-size: 16px; word-wrap: break-word; line-break: after-white-space;">
<br class="">
</div>
<div dir="auto" class="" style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 0); font-family: Calibri; font-size: 16px; word-wrap: break-word; line-break: after-white-space;">
Remote Location: <a href="https://urldefense.com/v3/__https://uchicago.zoom.us/j/98092551443?pwd=M2VWT3FlbVBQQ3dGQjhGMW9QT2QvQT09__;!!BpyFHLRN4TMTrA!-0U_WnHbRXbvKacJx3mhKCazqHArIQv44JmndOCKQG751thxwO7mMtaIsYN0DhTOKb3OJfrmkKLERKi8vMgIYJw7WxICzVKXPxiQgUq6Pw$" class="" title="https://urldefense.com/v3/__https://uchicago.zoom.us/j/98092551443?pwd=M2VWT3FlbVBQQ3dGQjhGMW9QT2QvQT09__;!!BpyFHLRN4TMTrA!-0U_WnHbRXbvKacJx3mhKCazqHArIQv44JmndOCKQG751thxwO7mMtaIsYN0DhTOKb3OJfrmkKLERKi8vMgIYJw7WxICzVKXPxiQgUq6Pw$" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif;">https://uchicago.zoom.us/j/98092551443?pwd=M2VWT3FlbVBQQ3dGQjhGMW9QT2QvQT09</a>
<div class="" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif;">
<br class="">
</div>
<div class="" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif;">
Meeting ID: 980 9255 1443</div>
<div class="" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif;">
Passcode: 937540</div>
<br class="">
Title: Characterizing the Opportunity for Reducing the Operational Carbon Footprint of Storage Systems<br class="">
<br class="">
Abstract: Data center power consumption and its carbon emissions are increasing rapidly. Storage<br class="">
systems are an important contributor to this problem. While storage technology and<br class="">
management techniques have improved rapidly, the growth of storage capacity used has grown<br class="">
faster, so improving efficiency is not enough. On the other hand, the efforts to decarbonize<br class="">
power grids have increased the variability in average carbon intensity, creating an opportunity to<br class="">
reduce carbon emissions by moving the flexible computing workload to low carbon periods.<br class="">
We study the University of Chicago’s high energy physics storage system, to identify<br class="">
opportunities to flex storage power consumption to reduce operational carbon footprint. First, we<br class="">
build a workload model for the background tasks, characterizing their IO, compute and power<br class="">
costs. Projecting to different data center scenarios shows these tasks consume ~2-4% of data<br class="">
center power and ~12-21% of data center storage power annually. Projections for varying<br class="">
hardware configuration show the shift to SSDs decreases the data center power consumption,<br class="">
while the power consumption of background tasks increases relative to data center storage<br class="">
power.<br class="">
Second, we consider power grid ACI variation, studying several Independent System Operators<br class="">
(ISOs) as settings. In one scenario, Hyperscale Data Center Worldwide (aggregate) in the<br class="">
California Independent System Operator (CAISO), the background tasks' carbon emissions are<br class="">
equivalent to the annual electricity use of ~323k US homes. By using carbon-optimized<br class="">
scheduling policies, these emissions can be reduced by ~60%. Even greater reductions (up to<br class="">
~81%) are possible as grids become more variable in the future. These results highlight the<br class="">
potential of background tasks for reducing storage system emissions. Our study is the first to<br class="">
show that data growth increases the power cost for data reliability, durability, availability and<br class="">
efficient storage space utilization faster than overall storage system power cost.<br class="">
<br class="">
Advisors: Andrew Chien<br class="">
<br class="">
Committee Members: Andrew Chien, Haryadi Gunawi, and Sanjay Krishnan<br class="">
<div class=""><br class="">
</div>
</div>
</div>
<div style="color: rgb(0, 0, 0);" class=""><br class="">
</div>
</div>
</div>
</div>
<br class="">
</div>
</div>
<br class="Apple-interchange-newline">
</div>
<br class="">
</body>
</html>