Thanks your replay. I will join the Clusterlabs users list.
2016-08-26 13:04 GMT+08:00 Digimer <lists@alteeve.ca>:
It's not at all old. Or rather, it's not "old" in the sense that it'sOn 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. ） sayshtml
>> 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
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
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