Dne 10.9.2015 v 11:30 Stefan Ring napsal(a):
I have a fairly simple dm-cache setup with one PV on an HDD partition as the origin block device, and the cache LVs live on a partition on an SSD. The cache is in writethrough mode. Since I have no prior experience with this, I basically followed the lvmcache man page when creating this setup a few months ago. Every morning at startup, the system immediately starts prolonged activity on the devices involved in the cache setup. iostat shows reading activity from the cache device and constant write activity on the HDD. The HDD is fully utilized, and this goes on for more than an hour. After that, everything goes into what I would consider the "normal" state with only the IO activity going on that I actively throw at it. Is this normal/expected? What does it do? Why does it write back huge amounts of data to the HDD after each system start? Kernel is currently 3.17.8-200.fc20.x86_64 (Fedora) Userland has been upgraded to fc22 meanwhile
Please first try to use the latest kernel. Kernel 3.17 is almost a year old. Lots of optimizations went in meanwhile. It's pointless to hunt already fixed bug. Zdenek _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
