Back-up Failure and exit code 8

[chrisandersen]

My MacBookPro with a 500GB SSD and OS X 10.11.6 uses an external Synology for Time Machine back-ups. Everything was working just fine until a couple of days ago, when I noticed that the back-ups started failing. First thing I did was take it down to where the wifi is to improve the speed of download and no improvement. It keeps bombing out about half way through the back-up. My iMac and Mini are still backing up just fine, so I think it must be the laptop's SSD.
I run a first aid from Disk Utility and it reports that there is an incorrect number of file hard links, Drive is corrupt and must be repaired, and file exit code is 8. Also says OK.
I restart the machine and run disk util again, and this time it says nothing about corruption and does say feel exit code is 8, Operation successful.
I force another back-up and get, 138 GB ion 537 GB available. Back up x of 543 MB. It starts off real slow (3 or 4 mb) then jumps real fast to 308 mb and then slows down again and fails.
I'm at a loss at why it won't back-up and the exit code 8 kinda scares me.

 

[donlab]

Applications --> Utilities --> Console
Under “LOG FILES” on the left click the triangle beside "/var/log".
Scroll down the list to "system.log". This should be the logs for today.
what do you see logged concerning the backups?

SSD...
try rebooting into recovery mode, launching disk utility and running a check / repair against the ssd.
what does disk utility report this time?
manually copy your important files and data to a safe place

found this older thread...
https://forums.macrumors.com/threads/file-system-check-exit-code-8-disk-wont-repair.1819660/

 

[chrisandersen]

Applications --> Utilities --> Console
Under “LOG FILES” on the left click the triangle beside "/var/log".
Scroll down the list to "system.log". This should be the logs for today.
what do you see logged concerning the backups?

SSD...
try rebooting into recovery mode, launching disk utility and running a check / repair against the ssd.
what does disk utility report this time?
manually copy your important files and data to a safe place

found this older thread...
https://forums.macrumors.com/threads/file-system-check-exit-code-8-disk-wont-repair.1819660/

The log showed a reference to a file on my gmail account. It stated that it copied 308 mb of data and then failed with error code 11.
The SSD shows good after recovery mode reboot.
I made a super duper copy.
And, it still bombs out about half way through. It sure is slow and then speeds up and then slow and bombs.

 

[CoastalOR]

Intermittent drive issues with your SSD performance and errors could be your internal drive SATA cable failing.
Here are a couple of recent threads:
https://forums.macrumors.com/threads/2012-mbp-freezing-even-on-clean-install.1989706/#post-23284909
https://forums.macrumors.com/threads/kernel-panic-and-weird-hdd-behavior.1988221/

 

[chrisandersen]

Thanks, but that's scary

 

[chrisandersen]

Update:
Did a reboot to single user mode (Command+S) and ran /sbin/fsck -fy and it found an invalid directory item count. It repaired it and when I rebooted and ran Disk Util again, I got a clean exit 0. Ran backup again (i had disabled it) and it started making a big 4.6 GB back up. It made it through 3+ GB when it bombed out again!

 

[donlab]

What did the logs say this time? what file did it fail on?