uptime record?
Dave Stevens
geek at uniserve.com
Sat Oct 23 18:18:19 UTC 2004
In Eric Raymond's recent report on Windows vs Linux security at:
http://www.theregister.co.uk/security/security_report_windows_vs_linux/
he states that:
Astute observers who examine the Netcraft web site URL will note that all 50
servers in the Netcraft uptime list are running a form of BSD, mostly BSD/OS.
None of them are running Windows, and none of them are running Linux. The
longest uptime in the top 50 is 1,768 consecutive days, or almost 5 years.
This appears to make BSD look superior to all operating systems in terms of
reliability, but the Netcraft information is unintentionally misleading.
Netcraft monitors the uptime of operating systems based on how those
operating systems keep track of uptime. Linux, Solaris, HP-UX, and some
versions of FreeBSD only record up to 497 days of uptime, after which their
uptime counters are reset to zero and start again. So all web sites based on
machines running Linux, Solaris, HP-UX and in some cases FreeBSD "appear" to
reboot every 497 days even if they run for years. The Netcraft survey can
never record a longer uptime than 497 days for any of these operating
systems, even if they have been running for years without a reboot, which is
why they never appear in the top 50.
This makes me wonder WHY Linux, Solaris, etc only record 497 days of uptime?
Does anyone know?
Dave
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