document supported architectures for PWL cache plugin
When I build Ceph RPMs and disable
WITH_RBD_SSD_CACHE, rbd still tries to dlopen the pwl cache lib. CMake did not build it, so rbd fails:
load failed dlopen(): "/usr/lib64/ceph/librbd/libceph_librbd_pwl_cache.so: cannot open shared object file: No such file or directory"
Unfortunately https://github.com/ceph/ceph/pull/40052 only enables the PWL cache on x86_64 and ppc64le, so this will happen on our s390x RPM builds.
#3 Updated by Ken Dreyer 3 months ago
Ok, thanks. I see now the user docs explain this at https://docs.ceph.com/en/latest/rbd/rbd-persistent-write-back-cache .
I'll document that this will not work on s390x.