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A common way for virtual machine cluster (VMC) to tolerate failures is to create distributed snapshot and then restore from the snapshot upon failure. However, restoring the whole VMC suffers from long restore latency due to large snapshot files. ...

Currently, there are important limitations in the abstractions that support creating and managing services in a cloud-based IT system. As a result, cloud users must choose between managing the low-level details of their cloud services directly (as in ...

The research literature on passwords is rich but little of it directly aids those charged with securing web-facing services or setting policies. With a view to improving this situation we examine questions of implementation choices, policy and ...

We present an in-depth study of over 200K log analysis queries from Splunk, a platform for data analytics. Using these queries, we quantitatively describe log analysis behavior to inform the design of analysis tools. This study includes state machine ...

Monitoring network traffic has become increasingly challenging in terms of number of hosts, protocol proliferation and probe placement topologies. Virtualised environments and cloud services shifted the focus from dedicated hardware monitoring devices ...

A new class of target link flooding attacks (LFA) can cut off the Internet connections of a target area without being detected because they employ legitimate flows to congest selected links. Although new mechanisms for defending against LFA have been ...

HTTP compression is an essential tool for web speed up and network cost reduction. Not surprisingly, it is used by over 95% of top websites, saving about 75% of webpage traffic.

The currently used compression format and tools were designed over 15 years ...

Solid-state drives (SSDs) are increasingly being considered as a viable alternative to rotational hard-disk drives (HDDs). In this paper, we investigate if SSDs improve the performance of MapReduce workloads and evaluate the economics of using PCIe SSDs ...

Historically, traces have been used by system designers for designing and testing their systems. However, traces are becoming very large and difficult to store and manage. Thus, the area of creating models based on traces is gaining traction. Prior art ...

System Administration is an emerging academic discipline, yet there remains no commonly accepted approach to teaching the core skill of troubleshooting system problems. Troubleshooting is considered by many in the field to be the single most important ...

Organizations develop and implement Electronic Knowledge Repositories (EKRs) to support the codification, storage and reuse of knowledge. EKRs are seeing increased use in expert technical professions, such as system administration. Sysadmin.nasa.gov is ...

System Administrators often need to have remote access to restricted networks that are separated for security reasons. The most common solution to this problem is to use a virtual private network (VPN) between the system administrator's client host to ...

In recent years data center operations have evolved into extensive infrastructures that can support of a wide range of computing paradigms, from traditional application hosting and data storage to service oriented architectures (SOAs) and emerging cloud ...

Large installations involve huge numbers of interacting components that are subject to a multitude of hardware failures, transient errors, software bugs, and misconfiguration. Monitoring the health, utilization, security, and/or configuration of such ...