doubt about raid 'quality'

hi guys, some days ago, i lost some data from my mysql database, it
was running nice, but start given bad record (one of my disks is bad)
i read some time ago about checks on md raids, could it be done
weekly? it´s a raid1 md device, i don´t know if it´s possible because
i read about raid5/6 devices only
it´s a newbie question, sorry

--
Roberto Spadim
Spadim Technology / SPAEmpresarial
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