Hi all, Short question: how to use bcache with read-only devices such as CD's or read-only NBD devices? Long text :-) I'm trying to setup 200+ LTSP Fat clients based on NBD remote block devices. LTSP mounts NBD devices in read-only mode and then their internal squashfs is remounted via copy-on-write and exposed to the client I'd like to create a local disk cache for /dev/nbdX by mean of BCache, but have a little problem: due to BCache superblock issues, I need to export NBD files in read/write (or copy-on-write mode) in order to get caching/cached devices superblock info synced. I cannot make assumption on client's local disk status, so its easy to lost sync with bcache info on server. So need: - An easy way to erase cache info and start in a "clean,uncached" state in server and client on client boot - A Read-Only BCache (or similar) that don't need to store any information on server side, just a list of blocks already in disk/memory in client - (For NBD guys) an extension to nbd-server to allow specify where to store copy/on/write diff files, and let postrun/prerun scripts use not only %s (file to be served) but %h (client ip being served), to erase diff files on connection Additionally Seems that there is no "blocks" package available for Ubuntu-14.04, as the one provided in ppa:g2p/storage has failed dependencies for python-3.4. I need command "blocks to-bcache" to provide proper squasfs-to-bcache files conversion (Any link on how to create BCache superblock and add it to an already created fs) Thanks in advance Juan Antonio -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
