We are currently having problems when we instantiate on new and updated servers to RHEL 7.3, the rest of region works correctly.
The error it shows us is the following:
libvirtd: unsupported configuration: native I/O needs either no disk cache or directsync cache mode, QEMU will fallback to aio=thread
Checking the server we see that when libvirtd generates the instance through XML the parameter appears:
- Red Hat OpenStack Platform 8
- nova.conf settings
- libvirt < 1.2.7-1.el7
preallocate_images=space disk_cachemodes = file=writeback
Subscriber exclusive content
A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.