From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: [0/3] POHMELFS high performance network filesystem. First steps in parallel processing. Date: Sat, 14 Jun 2008 05:52:38 -0400 Message-ID: <485394E6.9080809@garzik.org> References: <20080613163700.GA25860@2ka.mipt.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-fsdevel@vger.kernel.org To: Evgeniy Polyakov Return-path: Received: from srv5.dvmed.net ([207.36.208.214]:56567 "EHLO mail.dvmed.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756023AbYFNJwm (ORCPT ); Sat, 14 Jun 2008 05:52:42 -0400 In-Reply-To: <20080613163700.GA25860@2ka.mipt.ru> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Evgeniy Polyakov wrote: > Hi. > > I'm pleased to announce POHMEL high performance network parallel > distributed filesystem. > POHMELFS stands for Parallel Optimized Host Message Exchange Layered File System. > > Development status can be tracked in filesystem section [1]. > > This is a high performance network filesystem with local coherent cache of data > and metadata. Its main goal is distributed parallel processing of data. > > This release brings following features: > * Read requests (data read, directory listing, lookup requests) balancing > between multiple servers. > * Write requests are sent to multiple servers and completed only > when all of them sent an ack. > * Ability to add and/or remove servers from working set at run-time from > userspace (via netlink, so the same command can be processed from > real network though, but since server does not support it yet, > I dropped network part). > * Documentation (overall view and protocol commands)! > * Rename command (oops, forgot it in previous releases :) > * Several new mount options to control client behaviour instead of > hardcoded numbers. > * Bug fixes. Neat :) Thanks for protocol documentation, too. Do you plan to add write-pages in addition to write-page? Also, write-page does not appear to be documented. Is race-across-directories race-free? That is a sticky area, see Documentation/filesystems/directory-locking in particular. With the exception of encryption, do you think the POHMELFS client is mostly complete, at this point? Jeff