I recently moved my unraid h/w from my old case to a new silvertone case with hot swap drive bays about a week back. Since then whenever I try to write something to the array the transfer speed fluctuates wildly and even fails sometime (reaching 0 MB/s).  At the same time I see these errors popup in the logs:

 

May 13 08:51:56 MediaTower kernel: ata2.00: exception Emask 0x10 SAct 0x0 SErr 0x280100 action 0x6 frozen
May 13 08:51:56 MediaTower kernel: ata2.00: irq_stat 0x08000000, interface fatal error
May 13 08:51:56 MediaTower kernel: ata2: SError: { UnrecovData 10B8B BadCRC }
May 13 08:51:56 MediaTower kernel: ata2.00: failed command: READ DMA EXT
May 13 08:51:56 MediaTower kernel: ata2.00: cmd 25/00:40:50:17:c9/00:05:5c:00:00/e0 tag 0 dma 688128 in
May 13 08:51:56 MediaTower kernel: res 50/00:00:4f:17:c9/00:00:5c:00:00/e0 Emask 0x10 (ATA bus error)
May 13 08:51:56 MediaTower kernel: ata2.00: status: { DRDY }
May 13 08:51:56 MediaTower kernel: ata2: hard resetting link
May 13 08:51:56 MediaTower kernel: ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
May 13 08:51:56 MediaTower kernel: ata2.00: ACPI cmd ef/10:06:00:00:00:00 (SET FEATURES) succeeded
May 13 08:51:56 MediaTower kernel: ata2.00: ACPI cmd f5/00:00:00:00:00:00 (SECURITY FREEZE LOCK) filtered out
May 13 08:51:56 MediaTower kernel: ata2.00: ACPI cmd b1/c1:00:00:00:00:00 (DEVICE CONFIGURATION OVERLAY) filtered out
May 13 08:51:56 MediaTower kernel: ata2.00: ACPI cmd ef/10:06:00:00:00:00 (SET FEATURES) succeeded
May 13 08:51:56 MediaTower kernel: ata2.00: ACPI cmd f5/00:00:00:00:00:00 (SECURITY FREEZE LOCK) filtered out
May 13 08:51:56 MediaTower kernel: ata2.00: ACPI cmd b1/c1:00:00:00:00:00 (DEVICE CONFIGURATION OVERLAY) filtered out
May 13 08:51:56 MediaTower kernel: ata2.00: configured for UDMA/33
May 13 08:51:56 MediaTower kernel: ata2: EH complete

 

Can someone shed some light on this. Is this a bad cable connection I need to look at. Seems thee errors are always on ata2. If it's a loose / bad SATA cable causing the issue - which drive should I be looking at?

6 minutes ago, WorriedAboutDataLoss said:

Is this a bad cable connection I need to look at.

Most likely, replace the SATA cable.

27 minutes ago, WorriedAboutDataLoss said:

- which drive should I be looking at?

There will be entries in the syslog that tell you what drive is associated with ata2.

And if you can't find it post the complete diagnostics so we can see.

Thanks for your help everyone! Looks like I received a bad batch of SATA cables. Switched to an older cable I had lying around and the errors are all gone now and data transfer is very stable.