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I unplugged everything again and now the error does not occur anymore. I have no idea why. Used the same power cables, the same sata cables. Thanks anyways!

Even after swapping power cables again, the problem is still present. Has someone an idea what I can do?

Changed SATA port, it still happens with the same drive. tower-diagnostics-20200903-1908.zip

Yeah, I know these are SMR. It is not that big of a problem for me personally. Does Unraid recognize the drive if its attached to another SATA port?

Hey guys, I hope, I will find some help here. I couldn't find any information for exactly this problem online. My parity drive is spinning up ~ every minute. I can hear it. This is the disk log. You can see, its reconfigured every minute, but theres no link hard reset or something similar (found similar problems, that had all link resets). Sep 3 15:06:35 Tower kernel: ata1: SATA max UDMA/133 abar m2048@0xf5132000 port 0xf5132100 irq 26 Sep 3 15:06:35 Tower kernel: ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300) Sep 3 15:06:35 Tower kernel: ata1.00: ATA-10: WDC WD40EFAX-68JH4N0, WD-WX12D10E034Z, 82.00A82, max UDMA/133 Sep 3 15:06:35 Tower kernel: ata1.00: 7814037168 sectors, multi 16: LBA48 NCQ (depth 32), AA Sep 3 15:06:35 Tower kernel: ata1.00: configured for UDMA/133 Sep 3 15:06:35 Tower kernel: sd 1:0:0:0: [sdb] 7814037168 512-byte logical blocks: (4.00 TB/3.64 TiB) Sep 3 15:06:35 Tower kernel: sd 1:0:0:0: [sdb] 4096-byte physical blocks Sep 3 15:06:35 Tower kernel: sd 1:0:0:0: [sdb] Write Protect is off Sep 3 15:06:35 Tower kernel: sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00 Sep 3 15:06:35 Tower kernel: sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA Sep 3 15:06:35 Tower kernel: sdb: sdb1 Sep 3 15:06:35 Tower kernel: sd 1:0:0:0: [sdb] Attached SCSI disk Sep 3 15:06:57 Tower emhttpd: WDC_WD40EFAX-68JH4N0_WD-WX12D10E034Z (sdb) 512 7814037168 Sep 3 15:06:57 Tower kernel: mdcmd (1): import 0 sdb 64 3907018532 0 WDC_WD40EFAX-68JH4N0_WD-WX12D10E034Z Sep 3 15:06:57 Tower kernel: md: import disk0: (sdb) WDC_WD40EFAX-68JH4N0_WD-WX12D10E034Z size: 3907018532 Sep 3 15:07:23 Tower kernel: ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300) Sep 3 15:07:23 Tower kernel: ata1.00: configured for UDMA/133 Sep 3 15:09:29 Tower kernel: ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300) Sep 3 15:09:29 Tower kernel: ata1.00: configured for UDMA/133 Sep 3 15:10:33 Tower kernel: ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300) Sep 3 15:10:33 Tower kernel: ata1.00: configured for UDMA/133 Sep 3 15:11:32 Tower kernel: ata1: limiting SATA link speed to 3.0 Gbps Sep 3 15:11:36 Tower kernel: ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 320) Sep 3 15:11:36 Tower kernel: ata1.00: configured for UDMA/133 Sep 3 15:12:39 Tower kernel: ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 320) Sep 3 15:12:39 Tower kernel: ata1.00: configured for UDMA/133 Sep 3 15:36:19 Tower kernel: ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 320) Sep 3 15:36:19 Tower kernel: ata1.00: configured for UDMA/133 Sep 3 15:37:23 Tower kernel: ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 320) Sep 3 15:37:23 Tower kernel: ata1.00: configured for UDMA/133 Sep 3 15:38:26 Tower kernel: ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 320) Sep 3 15:38:26 Tower kernel: ata1.00: configured for UDMA/133 Sep 3 15:39:25 Tower kernel: ata1: limiting SATA link speed to 1.5 Gbps Sep 3 15:39:29 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 15:39:29 Tower kernel: ata1.00: configured for UDMA/133 Sep 3 15:40:33 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 15:40:33 Tower kernel: ata1.00: configured for UDMA/133 Sep 3 15:41:36 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 15:41:36 Tower kernel: ata1.00: configured for UDMA/133 Sep 3 15:42:40 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 15:42:40 Tower kernel: ata1.00: configured for UDMA/133 Sep 3 17:51:46 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 17:51:46 Tower kernel: ata1.00: configured for UDMA/133 Sep 3 17:53:58 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 17:53:58 Tower kernel: ata1.00: configured for UDMA/133 Sep 3 17:55:01 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 17:55:01 Tower kernel: ata1.00: configured for UDMA/133 Sep 3 17:56:00 Tower kernel: ata1.00: limiting speed to UDMA/100:PIO4 Sep 3 17:56:05 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 17:56:05 Tower kernel: ata1.00: configured for UDMA/100 Sep 3 17:57:08 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 17:57:08 Tower kernel: ata1.00: configured for UDMA/100 Sep 3 17:58:07 Tower kernel: ata1.00: limiting speed to UDMA/33:PIO4 Sep 3 17:58:11 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 17:58:11 Tower kernel: ata1.00: configured for UDMA/33 Sep 3 17:59:15 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 17:59:15 Tower kernel: ata1.00: configured for UDMA/33 Sep 3 18:00:18 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 18:00:18 Tower kernel: ata1.00: configured for UDMA/33 Sep 3 18:01:22 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 18:01:22 Tower kernel: ata1.00: configured for UDMA/33 Sep 3 18:02:25 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 18:02:25 Tower kernel: ata1.00: configured for UDMA/33 Sep 3 18:03:29 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 18:03:29 Tower kernel: ata1.00: configured for UDMA/33 Sep 3 18:04:32 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 18:04:32 Tower kernel: ata1.00: configured for UDMA/33 Sep 3 18:05:35 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 18:05:35 Tower kernel: ata1.00: configured for UDMA/33 Sep 3 18:06:39 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 18:06:39 Tower kernel: ata1.00: configured for UDMA/33 Sep 3 18:07:42 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 18:07:42 Tower kernel: ata1.00: configured for UDMA/33 Sep 3 18:08:46 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 18:08:46 Tower kernel: ata1.00: configured for UDMA/33 Sep 3 18:09:49 Tower kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310) Sep 3 18:09:49 Tower kernel: ata1.00: configured for UDMA/33 What did I do already? So, I replaced the sata cable and changed the power supply cable. Thanks in advance! tower-diagnostics-20200903-1810.zip