July 15, 20169 yr I had a 4TB HGST NAS drive as my parity drive. I currently have my disk settings set to spin down all array devices after 15 minutes. When my array devices spin up, my parity drive keeps spinning up and down and up and down and won't stop for a few minutes. Then it will start working normally for a few minutes, then go back to spinning up and down continuously for another few minutes. I thought the drive was bad but it passed all the smart tests. So i replaced the drive with Amazon for another new one and wouldn't you be surprised, same issue! It's only with the parity drive as far as i can tell. Also, I am not reading or writing anything while testing this. It also does this while reading and writing to the array and I'm not sure i have confidence in parity information being written to the parity drive when i can audibly hear the drive spinning up and down while it should be writing information. This is really bothersome and I'm not getting any errors or anything. Any ideas or help would be great. Thank you!
July 15, 20169 yr Post your diagnostics. How often does it actually spin up and down? When you say continuously, do you mean that it spins up and then immediately spins down again? Have you checked the power supply to that particular disk? Have you tried a different controller port? I would have tried both of these before replacing it. Whenever unRAID spins a disk up or down it places an entry in the syslog, like this: Jul 15 15:14:36 Lapulapu kernel: mdcmd (52): spinup 0 ... Jul 15 16:18:46 Lapulapu kernel: mdcmd (63): spindown 0 What does yours say? If the timeout is set to 15 minutes, then something else must be causing it to spin down.
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