[linux-lvm] lvm2 cluster aware

[su liu]

Thanks your replay. I will join the Clusterlabs users list.

2016-08-26 13:04 GMT+08:00 Digimer <lists at alteeve.ca>:

> On 25/08/16 11:59 AM, David Teigland wrote:
> > On Thu, Aug 25, 2016 at 09:50:24AM +0800, su liu wrote:
> >> I have a question about lvm2 cluster, The scene is that I try to imitate
> >> FCSAN by mapping a rbd volume to two compute node, Then I using the rbd
> >> volume to  create a PV and VG.I stoped the lvmetad daemon on the compute
> >> nodes. Then I find that when I operating the VG on one compute node, the
> >> changes can also be aware on another compute nodes.
> >>
> >> But this docment(http://www.tldp.org/HOWTO/LVM-HOWTO/sharinglvm1.html）
> says
> >> that "*LVM is not cluster aware".*
> >>
> >> My question is that can I use the method to achieve the case that I
> create
> >> or delete lv on one node whlie other compute node can using the lvs?
> >>
> >> Can anybody explain this?
> >
> > It's not safe to use lvm on shared storage without some extra mechanism
> to
> > protect the data or coordinate access among hosts.  There are multiple
> > ways, depending on what sort of sharing/coordination you want to use:
> >
> > - use system ID to protect VGs from other hosts,
> >   http://man7.org/linux/man-pages/man7/lvmsystemid.7.html
> >
> > - use lvmlockd to coordinate sharing with sanlock or dlm (this is new),
> >   http://man7.org/linux/man-pages/man8/lvmlockd.8.html
> >
> > - use clvm to coordinate sharing with dlm (this is old)
> >   http://man7.org/linux/man-pages/man8/clvmd.8.html
>
> It's not at all old. Or rather, it's not "old" in the sense that it's
> not used or developed anymore. It's still an active part of the HA
> cluster tool kit. DLM was just broken out to be stand-alone when
> corosync went v2 as part of the merger of the old cman/rgmanager to
> pacemaker migration.
>
> --
> Digimer
> Papers and Projects: https://alteeve.ca/w/
> What if the cure for cancer is trapped in the mind of a person without
> access to education?
>
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