Re: Failing RAID 5 rebuild / upgrade
If you suspect HW failure, try reading the SMART data using smartmontools. But I don't know all the options to use and to understand their results, you will have to google about using smartmontools. But it should be faster and most importantly safer than failing disks and see if the array gets rebuild.
After the smart results, and depending what they say, you might consider having two degraded raid5 arrays instead of thinking about raid1 for the new disks and then reshaping them to raid5. But you will need at least 4 sata ports for two degraded raid5 arrays (old array with two disks working, the new array created with two disks and missing member).
Darko.
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Ubuntu 18.04 LTS 64bit
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