Hi I'm please to announce new and completely rewritten distributed filesystem - POHMELFS It went a long way from parallel NFS design which lived in drivers/staging/pohmelfs for years effectively without usage case - that design was dead. New pohmelfs uses elliptics network [1] as its storage backend, which was proved as effective distributed system. Elliptics is used in production in Yandex search company for several years now and clusters range from small (like 6 nodes in 3 datacenters to host 15 billions of small files or hundred of nodes to scale to 1 Pb used for streaming). We start to cook up 2 small clusters for production pohmelfs testing - one of them is largest in East Europe mirror site, another one is used for internal package storage. Pohmelfs is just a POSIX frontend to elliptics. It supports hardlinks, symlinks, data checksums, multiple copies and so on. Pohmelfs uses local cache (synced on timely basis) for all operations, and only sync (or close with sync_on_close mount option) or writeback will flush data to remote nodes. There is also background work to flush data to storage like commit in ext3 Directory objects are synced to the storage when they are created on pohmelfs node, file data is being sent from cache later. All recovery process is handled by elliptics and is performed without pohmelfs clients every noticing that. In particular reads are always directed to the replica with the latest data (determined according to ellptics metadata checked at file open time). Writes in pohmelfs can be configured to succeed when quorum commits it or when specified in 'successful_write_count=' number of writes return ok. This is useful when you do not care much about number of active replicas, since you know that your data is safe. Or when you create new storage and want to copy to single datacenter to save bandwidth. But that's enough for advertisement. Here is the code. I do not know whether it is a good idea to ask it for inclusion into mainline tree right now skipping drivers/staging part. But anyway, I post patch to remove drivers/staging/pohmelfs and add fs/pohmelfs If it is not the way to go, I will resubmit. 1. Elliptics network http://www.ioremap.net/projects/elliptics http://www.elliptics.ru (russian support forum - we understand english and will answer pohmelfs questions too) 2. Pohmelfs http://www.ioremap.net/projects/pohmelfs (old and not yep updated site) http://www.ioremap.net/taxonomy/term/4 (development blog section) Signed-off-by: Evgeniy Polyakov -- Evgeniy Polyakov