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General software and network General OS-independent software and network questions, X11, MTA, routing, etc. |
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Virtualization maybe not such a great idea
Even the most advanced file system in existence might not save your data from buggy virtualizatin
http://lists.dragonflybsd.org/piperm...ch/207570.html |
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It should be mentioned that most uses of virtualization is for resource utilization and not security. Instead of buying 10 individual servers, 1 larger server can be purchased and "carved up" into 10 virtual machines.
Also, Mainframes have had virtual machines for decades and have been secure to my knowledge, unlike Xen, KVM, etc., but this may also be due to hardware. |
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As far as I understand, the cause of the data corruption, is that the virtual layer "lied" about having data being written to disk, while it was not, it was only cached.
An application of or a file system layer that is being lied, coupled with a crash, can cause data loss. For a mail server see Dan Bernstein's recommendation and explanation: http://cr.yp.to/qmail/faq/reliability.html#filesystems
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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump |
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In software, since 1972 with IBM's VM/370. In hardware since 1975 with Amdahl's Multiple Domain Facility (MDF).
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