Nom Nom Nom
Regretfully not burger related – but related to an error (I think) in the upgrade of Ubuntu 14.10 Utopic from 15.04.
In trying to figure out what it was that was causing iowait of 50% on an otherwise idle box, I was checking over processes with a fine toothed comb.
I discovered that for some reason the grub menu had launched with the same (unfamiliar) modules a lot of times.
This was teh reason why it sat in the process list thus….
/sbin/init nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw
Removing this previously unnoticed command from the boot sequence ended in badness.
Adding it back just the once resulted in the following….
/sbin/init nomdmonddf nomdmonisw
My understanding it is related to dmraid and mdadm. As this is a software RAID1 installation that would add up – but three times – really?
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In case it helps, the repetition of “nom nom nom” seems to be caused by /etc/default/grub.d/dmraid2mdadm.cfg appending the entries to the kernel command line without checking and dpkg-reconfigure grub-pc picking those up and writing them into /etc/default/grub — so each reconfigure of grub-pc will add one more iteration :-(
See my blog post (http://ewen.mcneill.gen.nz/blog/entry/2015-06-14-ubuntu-lucid-to-trust-in-two-larger-steps/) for some more details/links.
Ewen
Ewen – many thanks – much appreciated… I was getting that ‘it’s just me feeling‘. Indeed this is an MD configuration – and this appears to be the issue.