Hi, I am new to unraid and wasn't experienced with disks.

 

Recently I wanted to add a parity disk to my data-disks-only-array. While building the parity, unraid reported a massive amount of read errors (More than 600,000) on Disk 2 (Error column in the main GUI).

 

Because I have read that this is often caused by cabling, I changed and switched the SATA cables multiple times. But the read errors didn't go away. So the drive is probably faulty. Meanwhile I already found several "dead" files. At the moment I am rescuing the readable data with unBALANCE to another disk.

 

But this is strange: While other people with read errors usually have pending sectors or something like that in their SMART reports, mine seems to be ok. The disk has a bad "UDMA CRC error count" but if I googled right, this is not really problematic.

 

Can I fix the disk somehow or do I have to bin it? I have attached the diagnostics (Downloaded after the read errors happened)

 

All disks are from ebay ("Refurbished") and have never been precleared. I will do this as soon as possible, maybe they are faulty too... And I have ordered brand new ones.

nas-diagnostics-20200601-1043.zip

Errors are logged as actual disk errors, though this is not 100% reliable, you can run an extended SMART test to confirm.

On 6/3/2020 at 6:00 PM, johnnie.black said:

Errors are logged as actual disk errors, though this is not 100% reliable, you can run an extended SMART test to confirm.

 

Thanks for your answer. Strangely, the extended SMART test finished without errors. But a preclear I ran afterwards, died because of syntax errors after some reading errors:

 

Jun 05 00:14:48 preclear_disk_WD-WCC130368601_1194: Pre-Read: progress - 90% read @ 88 MB/s
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: dd: error reading '/dev/sdb': Input/output error
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records in
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records out
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 3608331948032 bytes (3.6 TB, 3.3 TiB) copied, 29171.4 s, 124 MB/s
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: dd: error reading '/dev/sdb': Input/output error
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records in
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records out
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 3608331948032 bytes (3.6 TB, 3.3 TiB) copied, 29171.4 s, 124 MB/s
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: dd: error reading '/dev/sdb': Input/output error
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records in
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records out
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 3608331948032 bytes (3.6 TB, 3.3 TiB) copied, 29171.5 s, 124 MB/s
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: dd: error reading '/dev/sdb': Input/output error
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records in
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records out
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 3608331948032 bytes (3.6 TB, 3.3 TiB) copied, 29171.5 s, 124 MB/s
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: dd: error reading '/dev/sdb': Input/output error
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records in
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records out
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 3608331948032 bytes (3.6 TB, 3.3 TiB) copied, 29171.5 s, 124 MB/s
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: dd process hung at 3608334045184, killing....
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Continuing disk read from byte 3608331948032
Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd if=/dev/sdb of=/dev/null bs=2097152 skip=3608331948032 count=392455081984 conv=notrunc,noerror iflag=nocache,count_bytes,skip_bytes
Jun 05 00:19:17 preclear_disk_WD-WCC130368601_1194: /usr/local/emhttp/plugins/preclear.disk/script/preclear_disk.sh: line 844: 8:06:10 + 3 : syntax error in expression (error token is ":06:10 + 3 ")
Jun 05 00:19:18 preclear_disk_WD-WCC130368601_1194: /usr/local/emhttp/plugins/preclear.disk/script/preclear_disk.sh: line 1139: 8:06:10 : syntax error in expression (error token is ":06:10 ")
Jun 05 00:19:18 preclear_disk_WD-WCC130368601_1194: Preclear: total elapsed time: 8:06:17

 

Oh and my syslog is really full of errors

Really looks like a disk problem, can you run another extended test?

19 hours ago, johnnie.black said:

Really looks like a disk problem, can you run another extended test?

 

Done. Completed again without errors. I also did another preclear (This time with the Joe L script), and at 90% pre-read it just stopped (No more progress was visible for multiple hours). The other preclear with the gfjardim script also died at about 90%.

 

I suspect the SMART system of this drive isn't working like it should.

Have you swapped/replaced cables? SMART test should fail if the disk is really that bad.

This time not. But the following reasons were enough for me to take the disk out of service:

• Read errors while parity checking even after sata cable replacing and switching
• Read errors while file moving, always with the same files, I couldn't move them (Tried it multiple times)
• Two preclears with different scripts failed while pre-reading at about 90%
• After removing the disk, my samba share performance increased A LOT (This problem got fixed). But at about the same time I upgraded Unraid from 6.7 to 6.8.3, so maybe it was not the disks fault. But I think so.

Edited June 9, 20206 yr by FloPinguin