Messages in this thread | | | Date | Fri, 1 Feb 2002 04:55:18 -0500 | From | Arjan van de Ven <> | Subject | Re: [Evms-devel] Re: [linux-lvm] Re: [lvm-devel] [ANNOUNCE] LVM reimplementation ready for beta testing |
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On Thu, Jan 31, 2002 at 12:52:11PM +0000, Joe Thornber wrote: > On Thu, Jan 31, 2002 at 01:52:29PM -0600, Steve Pratt wrote: > > 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. > > There's still a *lot* of code in there; > 26,000 lines in fact. > Whereas device-mapper weighs in at ~2,600 lines. This is just because > you've decided to take a different route from us, you may be proven to > be correct.
There is one thing that might spoil the device-mapper "just simple stuff only" thing: moving active volumes around. Doing that in userspace reliably is impossible and basically needs to be done in kernelspace (it's an operation comparable with raid1 resync, a not even that hard in kernel space). However, that sort of automatically requires kernelspace to know about volumes, and from there it's a small step....
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