Thanks for the input! Changing this value we indeed increased the recovery 
speed from 20 object per second to 500!

Now something strange:
1. We needed to change the class for our drives manually to ssd.
2. The setting "osd_mclock_max_capacity_iops_ssd" was set to 0. With osd bench 
descriped in the documentation, we configured the value 10000 for the ssd 
parameter. Only nothing changed.
3. But when setting "osd_mclock_max_capacity_iops_hdd" to 10000, the recovery 
speed also increased dramatically!

I don't understand this anymore :( Is the mclock scheduler ignoring the 
override of the device class?

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