journal on an ssd

Theodore Tso tytso at MIT.EDU
Thu Sep 11 21:57:23 UTC 2008

On Thu, Sep 11, 2008 at 04:38:15PM +0200, Tobias Oetiker wrote:
> you are the man, thanks ... that was the kind of answer I was
> looking for :-) I have started to smart mon my journal disk
> ... it has interesting properties in smart, a whole lot of which my
> version of smartmontools not seems to know about ... do you have
> any insight in this ? is there a list of relevant smart properties ?

Sorry, I don't.  You might try upgrading to newer version of
smartmontools, since as people figure out what some of the properties
mean (especially the ones with the high numbers that end to be hard
drive spceific, and not standardized) they get added to the smartmontools program.

Fortunately, it's not necessary to know what the properties mean in
order for smartmontools to know if the hard drive is about to fail.  

> I have also set errors=panic as a mount option, or is this unwise
> in this context ?

It's a good thing.  I would recommend using some kind of serial
console logger though, so that if there are failures, you can see what
the system emitted as its last gasp before panicking and rebooting
(since if the filesystmem containing /var/log is set with
errors=panic, you won't find that information in /var/log/messages).
In general, for any production machine, I recommend serial console
loggers, since if you have attackers who are have broken into your
machine with a rootkit, and attempt to hide their tracks by editing
the logs, presumably they won't have access to whatever machine you
have dedicated to capturing and storing the logs from the serial
console for all of your servers.

						- Ted

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