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-bash: /bin/su: Input/output error
That's today's message from bash. Fortunately seem's it's able to spawn it, su command and a bunch of others had not been so lucky.

The ps command is another of the lucky ones, an excerpt (hey! less also works) is highly insightful:
20292 ?        S      0:00 sh -c $SMARTD_MAILER -s 'SMART error (FailedReadSmartSelfTestLog) detected on host: busgosu' root 2>&1 << "ENDMAIL"?This email was generated by the smartd daemon running on:??   host name: busgosu?  DNS domain: [Unknown]?  NIS domain: (none)??The following warning/error was logged by the smartd daemon:??Device: /dev/sda, Read SMART Self-Test Log Failed??For details see host's SYSLOG (default: /var/log/syslog).??You can also use the smartctl utility for further investigation.?No additional email messages about this problem will be sent.?ENDMAIL?
20293 ?        S      0:00 /bin/bash -e /usr/share/smartmontools/smartd-runner -s SMART error (FailedReadSmartSelfTestLog) detected on host: busgosu root
20301 ?        S      0:00 run-parts --report --lsbsysinit --arg=/tmp/fileCJFXti --arg=-s --arg=SMART error (FailedReadSmartSelfTestLog) detected on host: busgosu --arg=root -- /etc/smartmontools/run.d
20302 ?        S      0:00 /bin/bash -e /etc/smartmontools/run.d/10mail /tmp/fileCJFXti -s SMART error (FailedReadSmartSelfTestLog) detected on host: busgosu root
20303 ?        S      0:00 /usr/bin/mail -s SMART error (FailedReadSmartSelfTestLog) detected on host: busgosu root

So /dev/sda is dying, now for real. It gave me some warnings two or three weeks ago, so last week I made a complete backup on its twin disk, using ddrescue, because dd wasn't able to do it without failing.

It's time, again, to seek for a couple of disks which last for almost five years... if possible.

So, still not using RAID1 ? :)

Heh, unfortunately no!

Had neither the time nor the need^Wcourage to put both drives in RAID, periodical syncs were enough 'til now.

But next ones will RAIDed be for sure ;-)

Unfortunately there's no SATA-1 drives for sale any more, I hope SATA-2 had no problem with a 5-year old motherboard, otherwise I will have to live in danger with a single 5-year old (but not heavily used) system disk.

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