SCALABILITY TESTING AND RESULTS Sample Clauses

SCALABILITY TESTING AND RESULTS. 31 4.1. Approach and Rational of Testing 31 4.2. Adding federation layers 32 4.3. Transfer protocols 33 4.4. Remote testing between sites 33 4.5. Results 34 4.5.1. Namespace Scalability Results 34 4.5.2. Parallel Write Tests 36 4.5.3. Parallel Read Tests 38 4.5.4. Parallel Read/Write Tests 40 4.5.5. Volume Tests 41 4.5.6. Inter-Site Testing 43 4.5.7. Other Tests 44
Sample 1
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SCALABILITY TESTING AND RESULTS. 4.1. Approach and Rational of Testing This section describes more details of the scalability test plan, an explanation and justifications of why, how the tests are performed and which centres are involved, and the challenge of testing scalability. As a part of the initial work the organisations involved in this task defined a set of tests which are to believe to meet some of the scalability issues likely to occur in the archival of large volumes of data. Details of the test plan are given in Annex B of this report. These cover the aspects previously mentioned including transfer rate testing when systems are under load and the impact of adding federation layers to access underlying storage, and namespace scalability tests. In order to meaningfully assess scalability limitations imposed by federation technologies, it is first necessary to understand the scalability and performance limitations of the underlying storage technologies. Within this task, six sites representing data centres have been involved (q.v. below) which cover a range of different storage technologies. In setting up these tests, each site has made their test storage infrastructure as similar as possible to that which is run in production. Accepting that there are differences between sites, we have endeavoured to capture these differences as part of the process; so for example we recorded the TCP/IP settings for each site, the specification of the hardware such as network cards and physical memory, whether the hardware is being run on physical or virtual machines, and so on. These could have an impact on the results obtained from each site and so are necessary for a full understanding of the results. It should also be noted that this ‘baseline testing’ did not include any federation tests; we did not try to replicate data between sites. This was a conscious decision since agreeing on a transfer technology would have been an arduous task and is not really relevant to understanding the scalability limitations of the storage systems themselves. We have also elected not to look at the scalability of any offline or nearline archives that may be associated with the storage system. While many data centres use such archives (for example tape robots or ‘green’ disks), accessing data on them needs to be controlled to ensure that efficient use is made of this facility. Within WLCG access is to the archival system is restricted to production managers; normal users typically do not have rights to trigger...
Sample 1

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