Hello everyone, I am currently working on implementing a custom caching algorithm in Ceph's librbd using the ImageCache interface, but I have found that not all of the requests we expect are being processed by the ImageCache::aio_read() function. Specifically, when we create a rbd image, map it to an nbd device, and mount this device on a Linux filesystem, we run a series of file read requests to test the algorithm. However, we find that the number of requests dispatched to ImageCache::aio_read() is not the same as the number of requests made by our test program. Normally this would not be a problem; however, our algorithm relies on having a complete data stream to perform some predictive caching. Is there some kind of caching happening at a higher level of Ceph that must be turned off first? Thanks, ----------- Spencer Melnick
