I am getting a BTRFS error spamming my logs and there appears to be other issued. SDB1 is my cache drive. I have Fix common problems installed and it is detecting that the drive is read only or full. But the drive is 480GB and it is only using 78GB, so there is plenty of space.

 

I have attached the diagnostics to this post

 

This is a snippet of the message being spammed:

Jan  6 05:12:23 LKNServer kernel: __btrfs_lookup_bio_sums: 10 callbacks suppressed
Jan  6 05:12:23 LKNServer kernel: BTRFS info (device sdb1): no csum found for inode 988745 start 0
Jan  6 05:12:23 LKNServer kernel: sd 1:0:0:0: [sdb] tag#5 UNKNOWN(0x2003) Result: hostbyte=0x04 driverbyte=0x00
Jan  6 05:12:23 LKNServer kernel: sd 1:0:0:0: [sdb] tag#5 CDB: opcode=0x28 28 00 03 d0 92 b8 00 00 08 00
Jan  6 05:12:23 LKNServer kernel: print_req_error: I/O error, dev sdb, sector 64000696
Jan  6 05:12:23 LKNServer kernel: BTRFS error (device sdb1): bdev /dev/sdb1 errs: wr 43, rd 254421, flush 0, corrupt 0, gen 0

Your help is much appreciated.

 

Thanks!

lknserver-diagnostics-20200107-0159.zip

No SMART for cache in those but looks like it may be a problem with the device instead of just the filesystem.

So, I need to replace the cache drive?

Cache device dropped offline:

Jan  6 01:01:01 LKNServer kernel: ata1: hard resetting link
Jan  6 01:01:07 LKNServer kernel: ata1: link is slow to respond, please be patient (ready=0)
Jan  6 01:01:11 LKNServer kernel: ata1: COMRESET failed (errno=-16)
Jan  6 01:01:11 LKNServer kernel: ata1: hard resetting link
Jan  6 01:01:17 LKNServer kernel: ata1: link is slow to respond, please be patient (ready=0)
Jan  6 01:01:22 LKNServer kernel: ata1: COMRESET failed (errno=-16)
Jan  6 01:01:22 LKNServer kernel: ata1: hard resetting link
Jan  6 01:01:27 LKNServer kernel: ata1: link is slow to respond, please be patient (ready=0)
Jan  6 01:01:57 LKNServer kernel: ata1: COMRESET failed (errno=-16)
Jan  6 01:01:57 LKNServer kernel: ata1: limiting SATA link speed to 3.0 Gbps
Jan  6 01:01:57 LKNServer kernel: ata1: hard resetting link
Jan  6 01:02:02 LKNServer kernel: ata1: COMRESET failed (errno=-16)
Jan  6 01:02:02 LKNServer kernel: ata1: reset failed, giving up
Jan  6 01:02:02 LKNServer kernel: ata1.00: disabled

 

With SSDs this is usually a cable/connection problem

After checking cables/connections post a new diagnostic.

Here is the diagnostics after I made sure the cables a plugged in correctly.

lknserver-diagnostics-20200107-2359.zip

Looks OK to me. Are you having any problems now?

I waited about a day after and it seems to be back. Fix common problems shows: Unable to write to cache and the log is about 34% full now. I do not have docker and vms running so it is just system messages causing the errors. I have attached diagnostics.

 

Also do I need to balance my cache? and if so, what command should I use?

lknserver-diagnostics-20200108-2158.zip

Edited January 8, 20206 yr by lankanmon

No SMART for cache again.

Okay, I will try swapping the cable and if that does not work, I will swap the drive...

 

Can you think of anything else it could be?

Edited January 9, 20206 yr by lankanmon

16 hours ago, lankanmon said:

Can you think of anything else it could be?

The way I usually put it is:

 

Check connections, SATA and power, both ends, including any power splitters. 

 

Could also be a bad cable, SATA or power. Could be a bad port.

 

I usually defer to more knowledgeable people on controller issues that involve multiple drives.

 

Could be bad drive but the SMART we got earlier seemed OK. It's not always clear to me how to interpret those in the case of SSDs of various manufacture though.

Hey thanks for this. I swapped out a bunch of SATA cables and it seems to have stopped the messages. I will keep an eye on it for now. Good to know that the drive is okay.