From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761279Ab2FEAxI (ORCPT ); Mon, 4 Jun 2012 20:53:08 -0400 Received: from terminus.zytor.com ([198.137.202.10]:50221 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761252Ab2FEAxH (ORCPT ); Mon, 4 Jun 2012 20:53:07 -0400 Message-ID: <4FCD5869.8000306@zytor.com> Date: Mon, 04 Jun 2012 17:52:57 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 MIME-Version: 1.0 To: George Shuklin CC: Casey Schaufler , Al Viro , linux-kernel Subject: Re: Why minor is still 8 bit? References: <4FCC0E6D.9000206@gmail.com> <20120604013504.GU30000@ZenIV.linux.org.uk> <4FCC3151.1040503@gmail.com> <4FCCDE2B.3020306@schaufler-ca.com> <4FCD0591.2050504@gmail.com> In-Reply-To: <4FCD0591.2050504@gmail.com> X-Enigmail-Version: 1.4.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 06/04/2012 11:59 AM, George Shuklin wrote: > Very simple sample: I'd like to create shared storage to publish volumes > via ISCSI. ~60Tb of drives, ~2Gb average disk size = 30k disk images. > Can I just create a bunch of LV and export them by iet or scst? Nope: > There is a serious limit for amount of active LV per host. Yes, I can > create filesystem, put images (as file) to that filesystem and publish > them back, but why FS is needed to do such simple task? You realize that with that many volumes, a logical volume manager *is* a filesystem, right? -hpa