February 7Feb 7 What troubleshooting steps should I take to determine if a cable or something else is causing a drive to get disabled while the array is online? Do my logs help show the reason?I've come across my third disable drive, all connected to the same PSU, power and data cable. My setup is two RSV cages, each with 4 drives connected to the same expander card and PSU. Each drive is connected via a 4-way SF-8087 to SATA to a HP DL380 and 4 connector power cables recommended by Seasonic support. Additionally, there is a second PSU driving 12 drives and connected to the same expander card. I have no issues with those 12 drives.I've familiarized myself with rebuilding on top of a drive by doing it twice (once was many months ago and the other a few weeks ago) but before I get into the third rebuild, I want to figure out what the real issue is. After just finishing my second rebuild, I started the array and within minutes a different drive got the red x. This third drive is on the same power cable as the previous two drives. I changed out the data cable before the second rebuild. It seems obvious to me that I should change out the power cable this time. I don't want to keep going around guessing at the culprit and am hoping to narrow down the real issue. I asked about this in Discord and reading the logs was the answer. So, my logs are attached because I'm not sure what I'm looking for. These logs are from minutes after the third drive became disabled and even though its been a couple weeks I have only stopped the array (no SMART test and no shutdown at this time). Thank you for reading and I appreciate any help the community can provide. diagnostics-20260121-1709.zip
February 7Feb 7 Community Expert Jan 21 16:33:48 hirsute-theater kernel: critical medium error, dev sdu, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2Add SMART attribute notifications: 1, 200 for each of your WD drives.Do an extended SMART self-test on disk10
February 8Feb 8 Author 16 hours ago, trurl said:Add SMART attribute notifications: 1, 200 for each of your WD drives.Do an extended SMART self-test on disk10I added notifications. When I added those notifications I got:raw read error rate is 1 for disk10raw read error rate is 6 for disk12Around the time the SMART test ended I got:multi zone error rate is 1 for disk10Extended SMART results are attached. smart-20260208-0817.zip
February 8Feb 8 Community Expert Solution Might be OK, but it was a disk problem not a connection problem that caused it to be disabled.Do you have another disk you could rebuild to?
February 8Feb 8 Author Not currently. The ones giving issue are my first drives from my QNAP. I'd like to replace them, but costs have been a bit high. I'd like to go up to 14TB. I'll start getting more serious on my search instead of looking for a unicorn in this market. How can you tell it's not a connection problem?
February 8Feb 8 Community Expert 14 minutes ago, NAS-t_Hirsute said:How can you tell it's not a connection problem?23 hours ago, trurl said:Jan 21 16:33:48 hirsute-theater kernel: critical medium error, dev sdu, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
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