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A comment on Early Linux filesystem reliability. Parent comment

Re:Early Linux filesystem reliability by kbaker on Wednesday May 31, 2017 @01:20AM (#14450579)
You are looking for the Magic SysRq Key: https://en.wikipedia.org/wiki/Magic_SysRq_key

- Alt+SysRq+u remounts all filesystems readonly.

Looks like some of the Magic SysRq Keys are disabled by default now in new Ubuntus.

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Re:Early Linux filesystem reliability by vanni on Wednesday May 31, 2017 @04:58AM (#14451171)
https://askubuntu.com/questions/11002/alt-sysrq-reisub-doesn...
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Re:Early Linux filesystem reliability by Piskvorrr on Wednesday May 31, 2017 @05:12AM (#14451213)
Yup. You need to set kernel.sysrq=1 , probably in /etc/sysctl.conf
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