Thanks to the work of François Cami, we now have a build of Ceph's Jewel release available for testing on the AArch64 platform.
You can find the packages on buildlogs at http://buildlogs.centos.org/centos/7/storage/aarch64/ceph-jewel/
To install them via yum, simply add a repository definition like the one below:
cat /etc/yum.repos.d/ceph-jewel-testing.repo
[ceph-jewel-testing] name=Ceph Jewel Testing baseurl=http://buildlogs.centos.org/centos/7/storage/aarch64/ceph-jewel/ metadata_expire=6h gpgcheck=0
Please test them out and let us know if anything isn't behaving as you'd expect.