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ext3 metaclustering

ext3 metaclustering

Posted Jan 17, 2008 23:19 UTC (Thu) by magila (subscriber, #49627)
In reply to: ext3 metaclustering by rfunk
Parent article: ext3 metaclustering

Disks these days are pretty good at hiding bad sectors from the host. If it gets bad enough
that the OS starts seeing bad data then the drive is probably on it's last legs and will soon
fail completely. In any case monitoring the SMART logs will usually catch a drive that is
gradually degrading without the frustrating fsck delays.


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ext3 metaclustering

Posted Jan 17, 2008 23:33 UTC (Thu) by rfunk (subscriber, #4054) [Link]

True, but how many people monitor SMART logs on a laptop, or even a desktop?
More to the point, how many of the people disabling the auto-fsck monitor their SMART 
logs?

ext3 metaclustering

Posted Jan 18, 2008 22:00 UTC (Fri) by nix (subscriber, #2304) [Link]

smartd can send you emails when things go suspiciously wrong.

ext3 metaclustering

Posted Jan 18, 2008 22:05 UTC (Fri) by rfunk (subscriber, #4054) [Link]

True.  How many people have system-level email working properly on their laptops, and 
are able to get such emails?

ext3 metaclustering

Posted Jan 18, 2008 22:14 UTC (Fri) by nix (subscriber, #2304) [Link]

Um, anyone competent? All sorts of other email, some security-important, 
gets sent by various daemons and shouldn't just be binned or ignored... of 
course a lot of people aren't competent :/

ext3 metaclustering

Posted Jan 18, 2008 22:20 UTC (Fri) by rfunk (subscriber, #4054) [Link]

My programmer coworkers have enough trouble with the task, and they're techies.  
Forget about the non-techie user that is adopting Linux more and more.

Everyone sets up their GUI mail program, and totally ignores the system-level MTA 
(sendmail/postfix/exim).  They just never get those emails.

(Sysadmin types being the exception, of course, but they're few and far between these 
days.)

ext3 metaclustering

Posted Jan 19, 2008 18:35 UTC (Sat) by raxyx (guest, #50026) [Link]

So THAT's that these MTAs are for. Cool. 


> Everyone sets up their GUI mail program, and totally ignores the system-level MTA 
> (sendmail/postfix/exim).  They just never get those emails.

Full ack on that. On some of my Debian machines, during the boot sequence, the thing that
takes the most time to get loaded is exim4, so one day I got fed up with it and removed it,
didn't notice any difference afterwards. I guess I'm going to rethink that move :-)

lightweight MTAs for outgoing mail only

Posted Jan 19, 2008 20:08 UTC (Sat) by liamh (subscriber, #4872) [Link]

I have taken to removing exim4 and installing either ssmtp or nullmailer
 aptitude install ssmtp exim4- exim4-base- exim4-config- exim4-daemon-light-
Just enough MTA to get the word out.  Since few people want/need a full MTA, this seems like
it should be the default.  But I don't smart disk monitoring; a few years back I tried it and
it led to some unreliable system behavior.

ext3 metaclustering

Posted Jan 19, 2008 1:56 UTC (Sat) by cortana (subscriber, #24596) [Link]

Well, Debian configures smartd to both mail root and display a notification on the desktops of
currently-logged-in users. :)

ext3 metaclustering

Posted Jan 17, 2008 23:56 UTC (Thu) by dberkholz (guest, #23346) [Link]

Google published a paper fairly recently on a large study of disk failures. As I recall, they
found that SMART logs were not reliable indicators.

ext3 metaclustering

Posted Jan 18, 2008 4:12 UTC (Fri) by magila (subscriber, #49627) [Link]

Notice I said gradually degrading. SMART won't help in the event of a catastrophic mechanical
failure, which is what most of the unanticipated failures in the Google study probably were.
Fsck doesn't help in that case either though. It's only the kinds of failures that cause a
slow accumulation of bad sectors that fsck would matter for, and those are the kinds of
failures that SMART is piratically guaranteed to catch.

ext3 metaclustering

Posted Jan 18, 2008 8:51 UTC (Fri) by njs (guest, #40338) [Link]

piratically... guaranteed...?

ext3 metaclustering

Posted Jan 18, 2008 22:03 UTC (Fri) by nix (subscriber, #2304) [Link]

That's SMArrrT for you.


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