On Sat, 2020-11-14 at 21:55 -0600, Valeri Galtsev wrote: > > On Nov 14, 2020, at 8:20 PM, hw <hw at gc-24.de> wrote: > > > > > > Hi, > > > > is it required to run /usr/sbin/raid-check once per week? Centos 7 does > > this. Maybe it's sufficient to run it monthly? IIRC Debian did it monthly. > > On hardware RAIDs I do RAID verification once a week. Once a Month a > not often enough in my book. That RAID verification effectively > reads all stripes of all drives (and verifies that content of > redundant drives is consistent), thus preventing a “time bomb”, when > a drive left alone for too long, ready to fail in an area which is > not accessed, and failing when at some point different drive was > replaced and RAID rebuild has to go over all stripes of all > drives. Such “multiple failures” are due to poor sysadmin’s work: > not often enough RAID verification. You mean there can be failures which can be detected during a raid-check and can still be repaired using the other disk, but they can be impossible to repair when a disk has failed? > If software raid-check does the same, then it makes a lot of sense, > and I am more with RedHat's weekly cron job, than with Debian’s > Monthly. How often do partial failures occur during normal operation? In case there was a power failure, it's probably a good idea to do a check anyway. > Valeri > > > I just checked on Fedora 32. It does not run raid-check at all, at least not > > via a cron entry. /usr/sbin/raid-check is available, though. Is that an > > oversight? (I started it manually now and will check if it's run once I update > > to 33.)