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authorB. Wilson <elaexuotee@wilsonb.com>2021-04-20 11:49:27 +0900
committerLeo Famulari <leo@famulari.name>2021-04-24 12:30:01 -0400
commit2c93df3d11bf8ceeb5c203416a2533cf32275e1a (patch)
tree6b79a3eef9b8acd66064a36dc0e305526674f972 /doc
parent794e26fda7c61d61fffe2ae778fdd3953bea3c60 (diff)
downloadguix-2c93df3d11bf8ceeb5c203416a2533cf32275e1a.tar
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services: Add a service for rasdaemon.
* gnu/services/linux.scm (rasdaemon-configuration, rasdaemon-configuration?, rasdaemon-configuration-record?, rasdaemon-service-type): New variables. * doc/guix.texi (Linux Services): Document it. Signed-off-by: Leo Famulari <leo@famulari.name>
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--- a/doc/guix.texi
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@@ -88,6 +88,7 @@ Copyright @copyright{} 2020 John Soo@*
Copyright @copyright{} 2020 Jonathan Brielmaier@*
Copyright @copyright{} 2020 Edgar Vincent@*
Copyright @copyright{} 2021 Maxime Devos@*
+Copyright @copyright{} 2021 B. Wilson@*
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -31442,6 +31443,86 @@ parameters, can be done as follow:
@end lisp
@end deffn
+@cindex rasdaemon
+@cindex Platform Reliability, Availability and Serviceability daemon
+@subsubheading Rasdaemon Service
+
+The Rasdaemon service provides a daemon which monitors the platform Reliablity,
+Availability and Serviceability (RAS) reports from the Linux kernel trace
+events, logging them to syslogd.
+
+Reliability, Availability and Serviceability is a concept used on servers meant
+to measure their robustness.
+
+@strong{Relability} is the probability that a system will produce correct
+outputs:
+
+@itemize @bullet
+@item Generally measured as Mean Time Between Failures (MTBF), and
+@item Enhanced by features that help to avoid, detect and repair hardware
+faults
+@end itemize
+
+@strong{Availability} is the probability that a system is operational at a
+given time:
+
+@itemize @bullet
+@item Generally measured as a percentage of downtime per a period of time, and
+@item Often uses mechanisms to detect and correct hardware faults in runtime.
+@end itemize
+
+@strong{Serviceability} is the simplicity and speed with which a system can be
+repaired or maintained:
+
+@itemize @bullet
+@item Generally measured on Mean Time Between Repair (MTBR).
+@end itemize
+
+
+Among the monitoring measures, the most usual ones include:
+
+@itemize @bullet
+@item CPU – detect errors at instruction execution and at L1/L2/L3 caches;
+@item Memory – add error correction logic (ECC) to detect and correct errors;
+@item I/O – add CRC checksums for transferred data;
+@item Storage – RAID, journal file systems, checksums, Self-Monitoring,
+Analysis and Reporting Technology (SMART).
+@end itemize
+
+By monitoring the number of occurrences of error detections, it is possible to
+identify if the probability of hardware errors is increasing, and, on such
+case, do a preventive maintenance to replace a degraded component while those
+errors are correctable.
+
+For detailed information about the types of error events gathered and how to
+make sense of them, see the kernel administrator's guide at
+@url{https://www.kernel.org/doc/html/latest/admin-guide/ras.html}.
+
+@defvr {Scheme Variable} rasdaemon-service-type
+Service type for the @command{rasdaemon} service. It accepts a
+@code{rasdaemon-configuration} object. Instantiating like
+
+@lisp
+(service rasdaemon-service-type)
+@end lisp
+
+will load with a default configuration, which monitors all events and logs to
+syslogd.
+@end defvr
+
+@deftp {Data Type} rasdaemon-configuration
+The data type representing the configuration of @command{rasdaemon}.
+
+@table @asis
+@item @code{record?} (default: @code{#f})
+
+A boolean indicating whether to record the events in an SQLite database. This
+provides a more structured access to the information contained in the log file.
+The database location is hard-coded to @file{/var/lib/rasdaemon/ras-mc_event.db}.
+
+@end table
+@end deftp
+
@cindex zram
@cindex compressed swap
@cindex Compressed RAM-based block devices