Thanks your replay. I will join the Clusterlabs users list. 2016-08-26 13:04 GMT+08:00 Digimer <[email protected]>:
> 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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