Bug#490787: replacement for evms?
Packages like cman and clvm (Red Hat's cluster LVM) are available in
Debian, is this the recommended enterprise solution now? It would be
good to point people in the right direction, and let them know what is
the strategic solution for Debian.
The wiki page http://wiki.debian.org/EVMS states that `you probably
don't want to go down this road', but doesn't really suggest any
alternatives.
The `Short' description, `An LVM + SoftwareRAID + Filesystem all-in-one
userspace system solution.', really doesn't do justice to EVMS's
enterprise features (such as cluster safe operation) that are completely
lacking from LVM.
Also, the comment that `EVMS was a good idea in it's time' suggests that
EVMS's features are no long relevant - for many enterprise users, the
benefits offered by EVMS when compared to LVM are just as important today.
While it's quite fair to decide that the lack of upstream support is a
good reason not to continue maintaining it in Debian, it would be useful
if you could clarify whether there is a recommended alternative for some
of the use cases that EVMS fulfills. Adding such comments to the wiki
and/or this RFA might help people who come across this as they decide
whether it is a package they want to adopt, or whether there are better
solutions for them.
An example of EVMS functionality that is not present in LVM: cluster
safe access to a volume group, e.g. several hosts have shared access to
a VG (through fibre channel), and each host mounts different volumes in
the VG. Using LVM, all the hosts have to be shutdown before making
meta-data changes (e.g. adding a new LV). With EVMS, however, it should
be safe to add a new LV while other hosts are using the same volume group.
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