Stochastic Models for Fault Tolerance: Restart, Rejuvenation by Katinka Wolter

By Katinka Wolter

As smooth society depends upon the fault-free operation of complicated computing platforms, method fault-tolerance has develop into an necessary requirement. accordingly, we want mechanisms that warrantly right provider in situations the place approach elements fail, be they software program or parts. Redundancy styles are favourite, for both redundancy in area or redundancy in time.

Wolter’s e-book information tools of redundancy in time that have to be issued on the correct second. specifically, she addresses the so-called "timeout choice problem", i.e., the query of selecting the correct time for various fault-tolerance mechanisms like restart, rejuvenation and checkpointing. Restart shows the natural procedure restart, rejuvenation denotes the restart of the working surroundings of a role, and checkpointing comprises saving the method kingdom periodically and reinitializing the approach on the most modern checkpoint upon failure of the process. Her presentation encompasses a short advent to the tools, their distinct stochastic description, and in addition facets in their effective implementation in real-world systems.

The booklet is focused at researchers and graduate scholars in method dependability, stochastic modeling and software program reliability. Readers will locate the following an up to date review of the major theoretical effects, making this the one accomplished textual content on stochastic types for restart-related difficulties.

Show description

Read or Download Stochastic Models for Fault Tolerance: Restart, Rejuvenation and Checkpointing PDF

Best networking books

LDAP System Administration

Be extra effective and make your existence more straightforward. That's what LDAP process management is all about.

System directors frequently spend loads of time dealing with configuration details positioned on many various machines: usernames, passwords, printer configurations, e-mail shopper configurations, and community filesystem configurations, to call a couple of. LDAPv3 presents instruments for centralizing the entire configuration info and putting it lower than your keep an eye on. instead of preserving numerous administrative databases (NIS, energetic listing, Samba, and NFS configuration files), you can also make adjustments in just one position and feature all of your structures instantly "see" the up to date information.

Practically platform self sufficient, this ebook makes use of the commonly to be had, open resource OpenLDAP 2 listing server as a premise for examples, displaying you ways to take advantage of it that will help you deal with your configuration info successfully and securely. OpenLDAP 2 ships with so much Linux® distributions and Mac OS® X, and will be simply downloaded for many Unix-based structures. After introducing the workings of a listing carrier and the LDAP protocol, all facets of establishing and fitting OpenLDAP, plus key ancillary applications like SASL and OpenSSL, this publication discusses:

• Configuration and entry control
• disbursed directories; replication and referral
• utilizing OpenLDAP to interchange NIS
• utilizing OpenLDAP to control e mail configurations
• utilizing LDAP for abstraction with FTP and HTTP servers, Samba, and Radius
• Interoperating with diverse LDAP servers, together with lively Directory
• Programming utilizing Net::LDAP

with a view to be a grasp of your area, LDAP method management can help you wake up and working quick despite which LDAP model you employ. After interpreting this booklet, in spite of no past LDAP event, you'll have the ability to combine a listing server into crucial community providers reminiscent of mail, DNS, HTTP, and SMB/CIFS.

Network Control and Optimization: First EuroFGI International Conference, NET-COOP 2007, Avignon, France, June 5-7, 2007. Proceedings

This quantity 4465 of the Lecture Notes in laptop technological know-how sequence is a coll- tion of the papers of the NET-COOP 2007 convention, a ? rst-of-a-series Euro- NGI/FGI convention on community keep watch over and Optimization. the development happened within the attractive urban of Avignon, France, June 5–7, 2007, used to be together or- nized through INRIA and the college of Avignon and was once hosted through the latter.

Formal Methods and Testing: An Outcome of the FORTEST Network, Revised Selected Papers

This e-book constitutes the completely refereed and peer-reviewed consequence of the Formal equipment and checking out (FORTEST) community - shaped as a community proven below united kingdom EPSRC investment that investigated the relationships among formal (and semi-formal) tools and software program trying out - now being a topic team of 2 BCS distinct curiosity teams: Formal features of Computing technology (BCS FACS) and certain curiosity crew in software program checking out (BCS SIGIST).

Extra info for Stochastic Models for Fault Tolerance: Restart, Rejuvenation and Checkpointing

Sample text

In most systems typical downtimes are much shorter than the uptimes. 100 ∗ γ is very common. This range is not shown in Fig. 3 for better visibility of all curves. All curves can easily be extended to obtain realistic numbers. g. the uniform distribution. 5 3 Fig. 2 Cumulative Uptime To obtain the probability of completing a task the system lifetime is not needed. Instead the cumulative uptime is used, which is computed similarly to the system lifetime. The cumulative uptime is the sum of n uptimes, under the condition of observing exactly n downtimes.

The uniform distribution. 5 3 Fig. 2 Cumulative Uptime To obtain the probability of completing a task the system lifetime is not needed. Instead the cumulative uptime is used, which is computed similarly to the system lifetime. The cumulative uptime is the sum of n uptimes, under the condition of observing exactly n downtimes. Yn = nU. 16) Similar as for the system lifetime, taking the LST and removing the conditioning on n gives FY∼ (s) = (1 − FD (b))FU∼ (s) . 17) must be inverted numerically.

8) is a necessary and sufficient condition for any number of restarts to be useful as well, a result that is not necessarily obvious at first hand. 8), for at least one value of τ . Generally speaking, first, distributions with heavy tails have the required behaviour. For such distributions, the tail decreases at polynomial pace, leaving considerable probability mass at high 44 3 Applicability Analysis of Restart values of T . Heavy-tailed and similar distributions commonly arise when studying Internet applications, see for instance [86].

Download PDF sample

Rated 4.32 of 5 – based on 16 votes