Monitoring in a grid cluster

The monitoring of a grid cluster (or of any piece of reasonably scaled IT infrastructure) is a key element in the robust and consistent running of that site. There are several factors which are important to the selection of a useful monitoring framework, which include ease of use, reliability, data input and output. It is critical that data can be drawn from different instrumentation packages and collected in the framework to allow for a uniform view of the running of a site. It is also very useful to allow different views and transformations of this data to allow its manipulation for different purposes, perhaps unknown at the initial time of installation. In this context, we present the findings of an investigation of the Graphite monitoring framework and its use at the ScotGrid Glasgow site. In particular, we examine the messaging system used by the framework and means to extract data from different tools, including the existing framework Ganglia which is in use at many sites, in addition to adapting and parsing data streams from external monitoring frameworks and websites

Analysis and improvement of data-set level file distribution in Disk Pool Manager

Of the three most widely used implementations of the WLCG Storage Element specification, Disk Pool Manager[1, 2] (DPM) has the simplest implementation of file placement balancing (StoRM doesn't attempt this, leaving it up to the underlying filesystem, which can be very sophisticated in itself). DPM uses a round-robin algorithm (with optional filesystem weighting), for placing files across filesystems and servers. This does a reasonable job of evenly distributing files across the storage array provided to it. However, it does not offer any guarantees of the evenness of distribution of that subset of files associated with a given "dataset" (which often maps onto a "directory" in the DPM namespace (DPNS)). It is useful to consider a concept of "balance", where an optimally balanced set of files indicates that the files are distributed evenly across all of the pool nodes. The best case performance of the round robin algorithm is to maintain balance, it has no mechanism to improve balance.<p></p> In the past year or more, larger DPM sites have noticed load spikes on individual disk servers, and suspected that these were exacerbated by excesses of files from popular datasets on those servers. We present here a software tool which analyses file distribution for all datasets in a DPM SE, providing a measure of the poorness of file location in this context. Further, the tool provides a list of file movement actions which will improve dataset-level file distribution, and can action those file movements itself. We present results of such an analysis on the UKI-SCOTGRID-GLASGOW Production DPM

A voyage to Arcturus: a model for automated management of a WLCG Tier-2 facility

With the current trend towards "On Demand Computing" in big data environments it is crucial that the deployment of services and resources becomes increasingly automated. Deployment based on cloud platforms is available for large scale data centre environments but these solutions can be too complex and heavyweight for smaller, resource constrained WLCG Tier-2 sites. Along with a greater desire for bespoke monitoring and collection of Grid related metrics, a more lightweight and modular approach is desired. In this paper we present a model for a lightweight automated framework which can be use to build WLCG grid sites, based on "off the shelf" software components. As part of the research into an automation framework the use of both IPMI and SNMP for physical device management will be included, as well as the use of SNMP as a monitoring/data sampling layer such that more comprehensive decision making can take place and potentially be automated. This could lead to reduced down times and better performance as services are recognised to be in a non-functional state by autonomous systems

Race Gaps in School Trust: Where They Come from and How to Resolve Them

Trust in American institutions varies widely among adults from different racial-ethnic backgrounds. This brief, from PRC faculty research associate David Yeager and colleagues, demonstrates that unjust treatment causes minority adolescents to lose trust in school, but a respectful "wise feedback" intervention can repair distrust.Population Research Cente

Population attributable risk of breast cancer in white women associated with immediately modifiable risk factors

BACKGROUND: Estrogen/progestin replacement therapy (EPRT), alcohol consumption, physical activity, and breast-feeding duration differ from other factors associated with breast cancer in being immediately modifiable by the individual, thereby representing attractive targets for future breast cancer prevention efforts. To justify such efforts, it is vital to quantify the potential population-level impacts on breast cancer considering population variations in behavior prevalence, risk estimate, and baseline incidence. METHODS: For each of these four factors, we calculated population attributable risk percents (PARs) using population-based survey (2001) and cancer registry data (1998–2002) for 41 subpopulations of white, non-Hispanic California women aged 40–79 years, and ranges of relative risk (RR) estimates from the literature. RESULTS: Using a single RR estimate, subpopulation PARs ranged from 2.5% to 5.6% for hormone use, from 0.0% to 6.1% for recent consumption of >= 2 alcoholic drinks daily, and 4.6% to 11.0% for physical inactivity. Using a range of RR estimates, PARs were 2–11% for EPRT use, 1–20% for alcohol consumption and 2–15% for physical inactivity. Subpopulation data were unavailable for breastfeeding, but PARs using published RR estimates ranged from 2% to 11% for lifetime breastfeeding >= 31 months. Thus, of 13,019 breast cancers diagnosed annually in California, as many as 1,432 attributable to EPRT use, 2,604 attributable to alcohol consumption, 1,953 attributable to physical inactivity, and 1,432 attributable to never breastfeeding might be avoidable. CONCLUSION: The relatively feasible lifestyle changes of discontinuing EPRT use, reducing alcohol consumption, increasing physical activity, and lengthening breastfeeding duration could lower population breast cancer incidence substantially

Ask For It: Development of a Health Advocacy Intervention for Adults with Intellectual Disability and Their General Practitioners

Two per cent of people in Australia have intellectual disability and the adults in this population often have poor health status. This poor health can be partly attributed to communication difficulties encountered by people with intellectual disability and also health professionals in consultation settings. The design and development processes of an educational intervention to improve communication between patients, general practitioners (GPs) and also advocates in a population of adults with intellectual disability are described. The design process was collaborative and involved adults with intellectual disability, GPs, parents, support workers and other professionals. It was a nine-step development process and led to the final communication tool package, the ask (advocacy skills kit) 5-year health diary and educational session. As a result of the collaborative design and development processes, this diary included qualities not found in most other medical record keeping systems: visual appeal, advice on how to be a health advocate, utility for a range of users, privacy, portability and sufficient capacity to record personal patient information which enhanced communication between doctor, patient and advocate. It is proving to be very popular. Clear implications were found for applying established criteria and incorporating the needs of users in the design of educational interventions in the intellectually disabled population. Health promotion tools aiming to improve the current poor health status of adults with intellectual disability should be developed further

Editorials

Continuing medical education in obstetrics and gynaecologyThe present and future of obstetrics and gynaecology in South AfricaThe case for an increased tobacco tax in South AfricaImplications of bacterial resistance for the use of beta-lactam agents in clinical practiceQuality of care - and debateAlcohol and brain damag