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These disks were connected using two or four QLogic ISP-2322 FC disk controllers. Unfortunately, unlike the TPC benchmarks, SFS does not normalize for different price configurations.

SPECMail is a benchmark to help evaluate performance of mail servers at an Internet service provider. SPECMail2001 is based on the standard Internet protocols SMTP and POP3, and it measures throughput and user читать далее time while scaling the number of users from 10,000 to 1,000,000. SPECWeb is a benchmark for evaluating the performance of World Wide Web servers, measuring number of simultaneous user sessions.

The SPECWeb2005 workload simulates accesses to a Web service provider, where the server supports home pages orgasm video women several organizations.

It has three workloads: Banking (HTTPS), E-commerce (HTTP orgasm video women HTTPS), and Support (HTTP).

Examples of Benchmarks of Dependability The TPC-C benchmark does in fact have a dependability requirement. The benchmarked system must be able to handle a single disk failure, which means in practice that all submitters are running some Orgasm video women organization in their storage смотрите подробнее. Efforts that are more recent have focused on the effectiveness of fault tolerance in orgasm video women. For a Web server, the obvious metrics are performance (measured as requests satisfied per second) and degree of fault tolerance (measured as the number of faults that can be tolerated by the storage subsystem, network connection topology, and so forth).

The example compared software RAID implementations provided by Orgasm video women, Solaris, and Windows 2000 Server. SPECWeb99 was used to provide a workload and to measure performance. To inject faults, one of the SCSI disks in the software RAID volume was replaced with an emulated disk. It was a PC running software using a SCSI controller that appears to other devices on the SCSI bus as a disk.

The disk emulator allowed the injection of faults. The faults injected included libido wife variety of transient disk faults, such as correctable read orgasm video women, and permanent faults, such as disk media failures on writes.

The two top graphs show Linux (on the left) and Solaris (on the right). As RAID systems can lose data if a second orgasm video women fails before reconstruction completes, the longer the reconstruction (MTTR), the lower the availability. Thus, there is a policy choice between taking a performance hit during reconstruction or lengthening the window of vulnerability and orgasm video women lowering the продолжение здесь MTTF.

Note the difference in philosophy on speed of reconstruction of Linux versus Windows and Solaris. The y-axis is behavior in hits per second running SPECWeb99. The arrow indicates time приведенная ссылка fault insertion.

Although none of the tested systems documented their reconstruction policies outside of the source code, even a single fault injection was able to give insight into those policies. The experiments revealed that both Linux and Solaris initiate automatic reconstruction of the RAID volume onto a hot spare when an active disk is taken out of service due to a failure.

Although Windows supports RAID D. Thus, without human intervention, a Windows system that did not rebuild after a first failure remains susceptible to a second failure, which increases the window of vulnerability.

It does repair quickly once told to do so. The fault injection experiments also provided insight into other availability policies of Linux, Solaris, and Windows 2000 concerning automatic spare orgasm video women, reconstruction rates, transient errors, and so on. Again, no system documented their policies.

The Linux implementation is paranoid-it would rather shut down a disk in a controlled manner at the first error, rather than wait orgasm video women see if the error is transient. In contrast, Solaris and Windows are more forgiving-they ignore most transient faults with the expectation that they will not recur. Thus, these systems are substantially more robust to transients than the Linux system. Note that both Windows and Solaris do log the transient faults, ensuring that the errors are reported even if not acted upon.

When faults were permanent, the systems behaved similarly. Full-scale simulation is also much more accurate and much more work to calculate expected performance.

This helpful orgasm video women is called queuing theory. Since there are many books and courses on the subject, this orgasm video women serves only as a first introduction to the topic. We are usually interested in the long term, or steady state, of a system rather than in the initial start-up conditions.

Although there is a mathematics that helps (Markov chains), except for a few cases, the only way to solve the resulting equations is simulation. This leads to a simple but important observation: If the system is in steady state, then the number of tasks entering the system must equal the number of tasks leaving the system. This flow-balanced state is necessary but not sufficient for перейти на страницу state.

If the system has been observed or measured for a sufficiently long time and mean waiting times stabilize, then we say that the system has reached steady state.

We also assume there is a steady supply of tasks independent for how long they wait for service. In many real systems, such as TPC-C, the task consumption rate is determined by other system characteristics, such as memory capacity.

Note that the arrival rate and the response time must use the same time unit; inconsistency in time units is a common cause of errors.

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Comments:

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