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

[emmanuel segura]

Jose

If i understand you looking for lvm snapshot

http://www.drbd.org/users-guide/s-lvm-snapshots.html

2012/2/2 Redding, Erik <erik.redding at txstate.edu>

> 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 at 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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