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Re: [Linux-cluster] HA-LVM and /etc/lvm/lvm.conf



Jose - Ignore the DRBD+LVM aspect - act like it's / in LVM because I'm not concerned about that part.  I describe it because it directly effects the LVM configuration if I turn on tagging.  Here's the info on LVM+DRBD: http://www.drbd.org/users-guide/s-lvm-lv-as-drbd-backing-dev.html  - it lets you gain a "roll back" technique if the DRBD sync breaks somehow because it snaps the underlying LV before it starts a sync.



Emmanuel - Thanks for the insightful comment but I would appreciate it if you'd elaborate on how you'd solve for the situation.  I'm open to other solutions if Red Hat has something better (and not CLVM because I require snapshots) but I don't see that there is one. As far as I can tell, this is the best solution for the requirements. 



Thanks, 
Erik Redding
Core Systems 
Texas State University-San Marcos





On Feb 2, 2012, at 3:19 AM, emmanuel segura wrote:

HA-LVM it's deprecated on redhat cluster

2012/2/2 jose nuno neto <jose neto liber4e com>
Hi

I have used LVM-HA on a previous project and for Failover Cluster works fine.
Didn't use DRBD with it, have tested DRBD for concurrent access to
devices/filesystems

For volume_list I would use something like this
"@rhel-01"
if you put
"@*"
think it will allow all tags
so guess you should remove it

anyway, didn't fully understand the DRDB here, you provide this LVM-HA has
DRBD resources? If so you dont need LVM tags for this. just normal LVM
LVM tags in redhat cluster are used to allow switching access to the Vgs
from one node to others

Regards
Jose

> I'm having a dialog with RH support about configuring HA-LVM within RHCS
> and I'm trying to see if there are some limitations and thought I'd ping
> the mailing list on the same subject.
>
> Is an HA-LVM configuration that only uses LVM tags useful beyond a single
> volume group?
>
> I'm attempting to provide a database service along side a pair of HA-NFS
> services that utilize DRBD and LVM (but drbd isn't the issue).
>
> on two nodes, rhel-01 and rhel-02, I currently I have three volume groups:
>  vgTest0, vgTest1, vgTestCluster
>
> vgTest0 and vgTest1 are volume groups that exist on each node, and they
> provide a single back-end LVM volume to a DRBD resource, so DRBD can
> leverage the snapshotting technique  during syncs.  Both nodes in the
> cluster have the same configuration, and DRBD is working fine.  This has
> been in production for about a month.
>
> I recently got the SAN resource that is presented to both hosts that I
> want to roll in LVM so I can utilize snapshots on the volume data.  I
> don't want to bother with CLVM because I have a use case for snapshotting,
> so HA-LVM as described: https://access.redhat.com/kb/docs/DOC-3068, I'm
> doing the second method.  The goal is a failover cluster.
>
> I've been struggling with how to configure my /etc/lvm/lvm.conf because of
> the volume_list parameter:
>
>
> # If volume_list is defined, each LV is only activated if there is a
> # match against the list.
> #   "vgname" and "vgname/lvname" are matched exactly.
> #   "@tag" matches any tag set in the LV or VG.
> #   "@*" matches if any tag defined on the host is also set in the LV or
> VG
> #
> # volume_list = [ "vg1", "vg2/lvol1", "@tag1", "@*" ]
>
> would I go with something like:
> volume_list = [ "vgTest0", "vgTestCluster/lvTest0", "@rhel-01", "@*" ]
>
> I don't get why I need to state a persistent volume group - and if I do,
> which one?  I've got two persistent groups on each node.  I don't use LVM
> on the root disk.
>
> Could I somehow expand this out to two HA-LVM volume groups? I don't see a
> way but thought I'd ask.
>
>
>
> Erik Redding
> Systems Programmer, RHCE
> Core Systems
> Texas State University-San Marcos
>
>
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