From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3FD9F93E.6070205@indygecko.com> From: Jord Tanner MIME-Version: 1.0 Subject: Re: [linux-lvm] Re: Device-mapper submission for 2.4 References: In-Reply-To: Content-Transfer-Encoding: 7bit Sender: linux-lvm-admin@sistina.com Errors-To: linux-lvm-admin@sistina.com Reply-To: linux-lvm@sistina.com List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: Date: Fri Dec 12 11:23:01 2003 List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: linux-lvm@sistina.com Device Mapper 1.00.07 patches against 2.4.23 with no problems. Follow the directections for device mapper at http://evms.sourceforge.net/install/kernel.html Jord Tanner Yanick Quirion wrote: >Hi, > >Is there a patch for device-mapper for kernel 2.4.23? > >Thanks > >Yanick > > > >>-----Original Message----- >>From: Alasdair G Kergon [mailto:agk@uk.sistina.com] >>Sent: 11 December, 2003 14:48 >>To: linux-kernel@vger.kernel.org; linux-lvm@sistina.com >>Cc: Paul Jakma; Mike Fedyk; Joe Thornber; Marcelo Tosatti; Linus >> >> >Torvalds > > >>Subject: [linux-lvm] Re: Device-mapper submission for 2.4 >> >>On Wed, Dec 10, 2003 at 03:40:07PM -0800, Mike Fedyk wrote: >> >> >>>On Wed, Dec 10, 2003 at 05:00:43PM +0000, Paul Jakma wrote: >>> >>> >>>>On Wed, 10 Dec 2003 venom@sns.it wrote: >>>> >>>> >>>>>DM is back compatible with LVM1, tested and runs well. >>>>> >>>>> >>>>What about the patches posted by Joe last (?) week which remove >>>> >>>> >LVM1 > > >>>>support from 2.6 DM? >>>> >>>> >>They remove support for the broken version 1 of the device-mapper >>ioctl interface. This is nothing to do with LVM1. >> >> >> >>>If this is what I was reading being discussed a few weeks ago, then >>> >>> >the > > >>>support for the LVM1 sysctls/ioctls has/will be removed, so you will >>> >>> >>have to >> >> >>>use the DM utilities instead of the old LVM1 utilities. LVM1 >>> >>> >on-disk > > >>format >> >> >>>should still be supported. >>> >>> >>2.6 does not support LVM1 ioctls. >>LVM2 userspace tools and EVMS both support LVM1 on-disk format using >>device-mapper. >> >> >>Here's a reference sheet to help clarify the terminology and explain >>what's happening. >> >>LVM1 = Userspace tools + kernel ioctls included in marcelo's 2.4 tree >> - LVM1 kernel ioctls are *not* included in or available for 2.6 >> - LVM1 userspace tools do *not* work with 2.6 kernels >> >>dm = Kernel driver (GPL) for new volume managers to use. >> - Included in Linus's 2.6 kernels. >> - Available as a patch for 2.4 kernels from the Sistina website. >> - Knows *nothing* about volume manager's on-disk metadata layouts. >> - Userspace volume managers (e.g. EVMS and LVM2) communicate via a >> >> >new > > >> ioctl interface. >> - This ioctl interface is currently "version 4" and we regard it as >> stable. [Some enhancements are on the horizon, but nothing that >> breaks existing code/binaries.] >> - An old development version of this device-mapper ioctl interface >> >> >known > > >> as "version 1" has problems with it, is deprecated and should be >> removed from kernel trees ASAP. >> Always use "version 4" when building new kernels today. >> >>libdevmapper = Userspace shared library (LGPL) which wraps a volume >>manager >> application interface around the device-mapper ioctls >> - Can determine transparently whether the kernel device-mapper is >> >> >using > > >> "version 4" dm ioctl interface or the deprecated "version 1" >> >> >interface > > >> and adapt itself accordingly. [configure --enable-compat] >> - Can only communicate with device-mapper: it cannot use LVM1 >> >> >ioctls. > > >> - Designed primarily for use by LVM2 tools. [EVMS does not use it] >> - Some parts of the libdevmapper API are not yet stable and are >> >> >likely > > >> to get changed. >> >>dmsetup = Userspace utility (GPL) which provides full command-line >> >> >access > > >>to >> the libdevmapper API. >> - Designed for use by shell scripts and for testing and debugging. >> - Command line interface may be considered stable. New features may >> >> >get > > >> added, but we'll try not to break existing commands. >> >>LVM2 = New Logical Volume Manager command line tools (GPL) designed to >> be backward-compatible with LVM1 and offering new features and >> more flexibility, configurability and stability. >> - Supports existing LVM1 on-disk metadata. >> This means you do *not* have to make changes to your existing >> >> >on-disk > > >> LVM1 volumes to switch between using LVM1 and LVM2. >> - Uses command lines similar to LVM1. >> - By default uses a new on-disk metadata format supporting more >> features than the original LVM1 version. >> - Communicates with the device-mapper kernel driver via >> >> >libdevmapper's > > >> API. >> >> >>Miscellaneous points: >> - LVM1 uses block major number 58: dm selects one or more major >> >> >numbers > > >> dynamically as required instead. >> - LVM1 uses character major number 109: dm selects a misc minor >> >> >number > > >> dynamically instead. >> - There's a (non-devfs) script for creating /dev/mapper/control at >> startup (or after dm module load). >> - You can use LVM1 tools with unpatched 2.4 kernels. >> - You can use LVM2 tools with patched 2.4 and unpatched 2.6 kernels. >> - Device-mapper support for snapshots and pvmove is so far released >> only for 2.4. Patches for 2.6 are being tested. >> - Multipath and mirror support are under development for 2.6. >> (Then get back-ported to 2.4.) >> >>Web download page: http://www.sistina.com/products_lvm_download.htm >> >>The device-mapper tarball contains: >> device-mapper kernel patches - needed only for 2.4; >> userspace libdevmapper and dmsetup - needed with all dm kernels. >>The LVM2 tarball contains the LVM2 command line tools. >> >>Development code can be found via: >> http://people.sistina.com/~thornber/ (for kernel patches) >> http://www.sistina.com/products_CVS.htm (for userspace code) >> >>Device-mapper mailing list: >> http://lists.sistina.com/mailman/listinfo/dm-devel >> >>Alasdair >>-- >>agk@uk.sistina.com >> >>_______________________________________________ >>linux-lvm mailing list >>linux-lvm@sistina.com >>http://lists.sistina.com/mailman/listinfo/linux-lvm >>read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ >> >> > >_______________________________________________ >linux-lvm mailing list >linux-lvm@sistina.com >http://lists.sistina.com/mailman/listinfo/linux-lvm >read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > >