On Mon, 18 Apr 2016, Valdis.Kletnieks@xxxxxx wrote:
> On Sun, 17 Apr 2016 10:47:55 -0400, "Robert P. J. Day" said:
> > i figure this is as good a place as any to ask ... is anyone here
> > aware of anyone using a linux config and install that, for the
> > purposes of reliability or high availability or whatever you want to
> > call it, relies on a second, completely independent installation of
> > linux on the same hard drive?
>
> IBM's AIX has for a long time had the concept of an 'alternate boot
> volume', which can be another logical volume on the same physical
> hard drive. But it's not intended for high-availability, it's for
> "if this software upgrade goes pear-shaped I have an easy backout
> procedure". And it avoids most of the "you have to keep two
> version" issues by providing a tool to copy your *current* system
> onto the alternate boot. I'm sure some Linux distros have stolen
> the concept.
that makes sense -- a *minimal* bootable system for recovery and
troubleshooting. but not a fully independent previous install.
> Most implementations of "high availability" would see the phrase "on
> the same hard drive" and start pointing and laughing at the single
> point of failure.
trust me, i'm aware of that. :-) perhaps i shouldn't have used the
phrase "high availability", this proposal was more for just the
ability to back out of a botched or flawed upgrade.
rday
--
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Robert P. J. Day Ottawa, Ontario, CANADA
http://crashcourse.ca
Twitter: http://twitter.com/rpjday
LinkedIn: http://ca.linkedin.com/in/rpjday
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