Yesterday, I decided to upgrade my Linode hosted, Xen virtualized server from Debian 6.0 “Squeeze” to Debian 7.0 “Wheezy“. Usually this process is quite easy, just adding some software channels and upgrading the software. This time, however, I ran into some nasty bug with different Xen host/guest Linux kernels and how they handle disk-io write-barriers. Continue reading
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