From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.saout.de ([127.0.0.1]) by localhost (mail.saout.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Sc1wn0r1vqDt for ; Fri, 23 Mar 2012 05:23:51 +0100 (CET) Received: from holgerdanske.com (holgerdanske.com [184.105.128.27]) by mail.saout.de (Postfix) with SMTP for ; Fri, 23 Mar 2012 05:23:50 +0100 (CET) Received: from ::ffff:69.12.202.165 ([69.12.202.165]) by holgerdanske.com for ; Thu, 22 Mar 2012 21:11:50 -0700 Message-ID: <4F6BF806.1000504@holgerdanske.com> Date: Thu, 22 Mar 2012 21:11:50 -0700 From: David Christensen MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Subject: [dm-crypt] LUKS/ dm-crypt/ ext4 appears to be single threaded List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: dm-crypt@saout.de dm-crypt: Thread moved from debian-user. Please comment. TIA, David I have a 1.5 TB SATA hard drive I use for back-up's. It has a single large partition encrypted with LUKS/ dm-crypt and formatted with ext4. I've noticed what appears to be single-threaded behavior when one process is performing a long-lived write to the disk (notably 'ssh user@host tar ... > backupfile.tar.gz') and another process attempts to access the disk (either read or write). This is tolerable for a back-up application, but would not be acceptable for multi-user, multi-process, and/or multi-threaded applications (file server, terminal server, web server, etc.). Is this a fundamental limitation of LUKS, dm-crypt, and/or ext4, or something I've configured/ misconfigured? If a fundamental limitation, is there something I can substitute to eliminate the problem? Some manufacturers make hard drives with built-in encryption. Are these supported by Debian, Linux, or BSD? http://www.seagate.com/www/en-us/products/self-encrypting-drives/ Any other comments or suggestions? TIA, David