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It doesn't require any argument and will assemble all the md devices found.
| Code Block |
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mdadm-startall |
Routine maintenance
At least Debian 7 Wheezy has /etc/cron.d/mdadm which runs
/usr/share/mdadm/checkarray --cron --all --idle --quiet
on the 14th of each month at 02:19.
The command only checks the md arrays, it does not fix them. For each array /dev/md/<n>, it results in messages in syslog like:
RebuildStart event detected on md device ...
Rebuild(20|40|60|80) event detected on md device ...
RebuildFinished event detected on md device ...
Despite "Rebuild" it is actually a check.
For small arrays the "Rebuild(20|40|60|80) ..." progress indicators are not generated. We have seen some of those messages missing. For sure the RebuildStart message was missing on blav2 for
Sometimes mismatches are reported according to https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=518834#38 that is a problem for RAID 5 but not for RAID 1. Presumably, by extension it is a problem for RAID 6 too.
Troubleshooting
initrd fails to assemble md devices
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