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Clicking HDD in NAS: not 100% sure which one (lemmy.blackeco.com)

submitted 1 month ago by BlackEco@lemmy.blackeco.com to c/selfhosted@lemmy.world

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Hello,

One of my HDDs in my NAS started clicking recently. I intend to replace it, but I want to make sure that I correctly pinpointed the faulty one.

I have 5 HDDs in my NAS and I presume it's the bottom one, as the sound seems to come from one of the 2 drives at the bottom and its activity LED stays lighted up longer than the others when clicking. (Oh yes, clicking is intermittent, the only reliable way I found to make it click regularly was to scroll ~1700 RAWs in Darktable.)

Is there any indicator that can confirm this is the faulty one? Long SMART tests obviously report nothing and all drives have the same temperature. Maybe a latency test? I'm not sure how to conduct that on TrueNAS (my pool is a 4-wide RAIDZ1 with one Hot Spare)

Thank you very much!

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[–] pcouy@lemmy.pierre-couy.fr 9 points 1 month ago (1 children)

I had one such case recently, turned out it was due to a faulty SATA (data) cable. Once you find which drive is clicking, try plugging it with a new cable before declaring it dead.

dmesg output may contain some useful error messages. If you find errors related to I/O, block devices, SCSI or SATA, you should include them in your post

[–] MysteriousSophon21@lemmy.world 2 points 1 month ago

This is solid advice. I've had the exact same experience where a "failing" drive was just a bad SATA cable. Saved me like $80 on a new drive. Smart move to check dmesg too, it'll usually show I/O errors if its a connection issue vs actual drive failure.