Kevin, I understand how LVM2, DM, and EVMS are architected. I still have no idea what the article is talking about. Are you saying that the referenced sources just don't understand how it all works and that the "industrial-strength Logical Volume Manager" they want is achievable via the current DM implementation in combination with appropriate high quality user-space tools? That certainly agrees with what I thought and why I was so confused by the article. Thanks Greg -- Greg Freemyer >> (Once more - with feeling this time!) >> Device-Mapper is the new kernel driver in 2.5. It replaced the LVM1 kernel >> >> driver from 2.4. This driver provides generic "volume management" >> capabilities. Specifically, it can create devices which simply redirect >> I/O >> to other underlying devices. Such a device could be thought of as a >> "logical >> volume". >> LVM2 and EVMS are both actively developed projects that utilize the >> Device-Mapper driver for creating their "logical volumes". Neither LVM2 >> nor >> EVMS are (or will be) "in the kernel". All of the real complexity of >> volume >> management is done in user-space. It is far more sensible to ask a >> question >> like "will LVM2 and/or EVMS be included in the next release of Red Hat or >> Debian?" And the next major release of these distros may not correspond >> exactly with the release of the 2.6.0 kernel. >> To prevent reposting all of the gory details, please see a very similar >> previous discussion at: >> http://marc.theaimsgroup.com/?t=104164610600002&r=1&w=2 >> and >> http://marc.theaimsgroup.com/?t=104195031700002&r=1&w=2 >> On Wednesday 21 May 2003 12:42, Anastasios A. Papadopoulos \(Tas\) wrote: >> > Now I am really confused. (Sorry folks, it doesn't take much). >> > >> > I thought that EVMS was dead. The EVMS web site says something to the >> > effect that the new EVMS product will be mostly a front end for (LVM?). >> Am >> > I reading that wrong? >> > >> > Also in their announcement, the EVMS development group said that Linus >> etal >> > decided to include LVM but not EVMS. >> > >> > Can someone straighten me out, please? >> > >> > Thanks >> > >> > ----- Original Message ----- >> > From: "Greg Freemyer" <freemyer@NorcrossGroup.com> >> > To: "LVM Mailing list" <linux-lvm@sistina.com> >> > Sent: Wednesday, May 21, 2003 1:06 PM >> > Subject: What are they talking about? >> > >> > >> > In the article at http://www.eweek.com/article2/0,3959,1054003,00.asp >> > >> > they talk about the 2.6 kernel having a DM, but not a LVM. >> > >> > What are they trying to say? What is it they think is missing? >> > >> > === Quote from the article >> > >> > According to Witham, a number of features that the development community >> > believes are not yet ready to be incorporated into the 2.6 kernel may >> very >> > well be pushed to 2.7. >> > >> > Among these features are support for complete Non-Uniform Memory Access >> > as well as an EVMS (Enterprise Volume Management System), which deals >> > with the difficult and controversial issue of volume management, Frye >> said, >> > adding that 2.6 would be better than 2.4 in terms of volume management >> even >> > without the EVMS. >> > >> > Oracle Corp. and Red Hat Inc. officials have also previously called for >> > volume >> > management. Wim Coekaerts, principal member of Oracle's technical staff, >> in >> > Redwood Shores, Calif., said: "We would like Linux to have a Logical >> Volume >> > Manager. The 2.6 kernel will have a device manager, but we need an LVM." >> > >> > Paul Cornier, executive vice president of Red Hat, in Raleigh, N.C., >> > agreed. >> > >> > "Making a more generic cluster file system is important to us, as is an >> > industrial-strength Logical Volume Manager," Cornier said. "A >> distributed >> > lock >> > manager completes things. This is functionality that needs to go into >> the >> > operating >> > system but is unlikely to be found in the next [kernel] upgrade." >> > >> > IBM's Frye said that there's clearly a need for an improved volume >> > management >> > system and that Linux is not yet good enough in that regard. >> > ==== >> > >> > Thanks >> > Greg >> > -- >> > Greg Freemyer >> -- >> Kevin Corry >> kevcorry@us.ibm.com >> http://evms.sourceforge.net/ >> _______________________________________________ >> 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/
