Arjen Hiemstra

Q: El Capitan: Kernel: hfs_clonefile: cluster_read failed - 34

I got loads and loads of these errors after upgrading to El Capitan. Sometimes as much as thousands per 10 minutes. Sometimes so bad, that IO was heavily impacted when logging these errors.

 

After booting it is normally OK, but it starts at some point and gets worse and worse with multiple occurrences per second.

 

Googling found 0 (!). There are a lot of topics with "cluster_read failed - 5", but these are real Disk I/O errors and always also show an accompanying Disk I/O error. I do *not* get Disk I/O errors.

 

I put the drive through DriveGenius 4 and all OK.

 

I'm trying to find out why this happens and it looks like this is El Capitan specific. If I do a fresh install of El Capitan on a freshly formatted drive, It takes about 10 minutes for this error to kick in. The same procedure with Yosemite does NOT produce this error.

 

Things that I think might be related:

 

- Running El Capitan instead of Yosemite

- iMac (27-inch, Late 2012)

- Thunderbolt connected drives

- Perhaps related to sleep mode (although this does not happen under Yosemite!!!)

- Perhaps related to FileVault (I pre-format my drive encrypted before installing).

- Perhaps related to LaCie 2big Thunderbolt 2 drives

 

Things that are not related:

- Software installed (I did fresh installs of Yosemite and El Capitan to compare)

- Hard drive sector errors

 

Anyone seen this as well?

iMac (27-inch, Late 2012), OS X El Capitan (10.11), errors in system.log

Posted on Oct 20, 2015 4:34 PM

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Q: El Capitan: Kernel: hfs_clonefile: cluster_read failed - 34

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