[linux-lvm] Strange dm-cache activity at startup

Simon O'Riordan verucasaltuk at hotmail.co.uk
Fri Sep 11 14:50:17 UTC 2015

Avoid losing data by imaging the drive using Clonezilla. I do it all the 

On 11/09/2015 14:28, John Stoffel wrote:
>>>>>> "Joe" == Joe Thornber <thornber at redhat.com> writes:
> Joe> On Thu, Sep 10, 2015 at 11:30:27AM +0200, Stefan Ring wrote:
>>> Is this normal/expected? What does it do? Why does it write back huge
>>> amounts of data to the HDD after each system start?
> Joe> No, this is not expected.  The most likely cause is your system was
> Joe> not shutdown cleanly so dm-cache has no choice but to assume all
> Joe> blocks are dirty and need writing back.  Make sure your volumes are
> Joe> being deactivated as part of shutdown.
> How would you double check to make sure this happening properly in the
> logs?  I'm interested in using an SSD to cache my home file server
> /home and /local directories to make NFS access faster... but I've
> been hesitant to upgrade since I'd hate to lose all this data.
> John
> _______________________________________________
> linux-lvm mailing list
> linux-lvm at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

More information about the linux-lvm mailing list