[Ocfs2-users] Does OCFS2 support these features?

[Alexei_Roudnev]

About (3):

OCFS @ SuSe supports evms clustered volume manager and external heartbeat2
clusterware. I can not say anything about quality, but they demonstrated
this combination on the last Linuxworld:
- 4 servers
- serverst runs heartbeat2
- ocfsv2 use heartbeat2 instead of o2cb (excellent idea because o2cb is
extremely poor clusterware)
- evms works together with heartbeat2 (it provides clusterware and fencing
and reliable heartbeat)
- ocfs works over the evms.

To be correct - nothing prevents OCFSv2 from working on LVM2 with (or even
without!) cluster support.
I can create few LVM volumes (without any clusterware), mount them on 4
servers and run OCFS on them - and
it all will work until you want to change LVM data (then you need special
procedure OR cluster support @ lvm).
Problem arise WHEN you began to use clusterware - if you have a few
clusterware on the same servers (for example,
Oracle CRS/CSS, OCFSv2 o2cb, and LVM heartbeat2), then you are in trouble
because you have a high chance of mutial fencing (and total cluster crash).
I have a logs which shous such failure - few cluster wares kills each other
on a minor network glitch.

So, I love an idea of dropping down o2cb based heartbeat,  which never was
good - it have not external fencing, it don't support
multiple heartbeat channels, it don't support serial interconnection and so
on - and integrating OCFSv2 with Heartbeat2
 (which is not 100% perfect but is much better and much more reliable), and
(later) integrating it all with clustered LVM (I dont think that EVMS is a
good choice, because it have too little installation base so, esxcept if
SuSe debug it well, integrate with YaST and make it primary system, better
to avoid it) - they it can be a very good cluster system.

Anyway, you can take SLES10 and try this integration, or can just build
OCFSv2 over LVM and then bring all but one nodes down when you want to
change LVM volumes (to make sure that all volumes see the change). Of
course, you can ot use mirroring and raid if you use LVM without cluster
support (can use only statically allocated volumes).

> > Can someone let me know if OCFS2 support the following features.
> >
> > 1. Quota.
> > 2. POSIX ACL
> > 3. Clustered volume manager
> >
> > Lin