Joe Thornber wrote: >On Wed, Jan 30, 2002 at 10:03:40PM +0000, Jim McDonald wrote: >> Also, does/where does this fit in with EVMS? >EVMS differs from us in that they seem to be trying to move the whole >application into the kernel, No, not really. We only put in the kernel the things that make sense to be in the kernel, discovery logic, ioctl support, I/O path. All configuration is handled in user space. > whereas we've taken the opposite route >and stripped down the kernel side to just provide services. Then why does snapshot.c in device mapper have a read_metadata function which populates the exception table from on disk metadata? Seems like you agree with us that having metadata knowledge in the kernel is a GOOD thing. >This is fine, I think there's room for both projects. But it is worth >noting that EVMS could be changed to use device-mapper for it's low >level functionality. That way they could take advantage of the cool >work we're doing with snapshots and pvmove, and we could take >advantage of having more eyes on the core driver. Since device_mapper does not support in kernel discovery, and EVMS relies on this, it would be very difficult to change EVMS to use device_mapper. Besides, EVMS already has all the capabilities provided by device mapper, including a complete LVM1 compatibility package. >LVM2 may not seem that exciting initially, since the first release is >just concentrating on reproducing LVM1 functionality. But a lot of >the reason for this rewrite is to enable us to add in the new features >that we want (such as a transaction based disk format). It's on this >new feature list that we'll be mainly competing with EVMS. Why compete, come on over and help us :-) Steve EVMS Development - http://www.sf.net/projects/evms Linux Technology Center - IBM Corporation (512) 838-9763 EMAIL: SLPratt@US.IBM.COM _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
