[ClusterLabs] Antw: [EXT] Re: CCIB migration from Pacemaker 1.x to 2.x

[Ulrich Windl]

>>> "Sharma, Jaikumar" <jaikumar-sharma at outlook.com> schrieb am 30.01.2021 um
13:41
in Nachricht
<BM1PR01MB2227AB087ABC658D1A6F7A9AF7B89 at BM1PR01MB2227.INDPRD01.PROD.OUTLOOK.COM>


>> fence_drac5 , fence_drac (not sure about that) , SBD
> I've configured IPMI over LAN giving static IP addresses to both nodes (at 
> iDRAC level) in cluster and I can power reset/reboot both nodes in the 
> cluster by sending commands from OS using ipmitool, but not sure how fencing

> is going to work if one node out of two has network cable plugged out? Since

> it is out of the cluster, not possible to reboot it as it is already out of

> the cluster and without network connectivity.
> 
> Reason to implement fencing (as this thread started with) is that in two 
> node cluster (master/slave), one node losing network connectivity (because
of 
> pulling out the network cable of master node) and slave will become new 
> master and provide the necessary services , but as soon as I plug‑in the
cable 
> back to the node race of joining this node as master starts while there is 
> already a master and database sync issue occur between the two nodes.

That's why traditional fencing uses an "independent channel" like SCSI (not
iSCSI) or FibreChannel (sbd supports such).
When lkimited to network, you should have a redundant network connection like
via bonding.

> 
> How will fencing (node or resource ?) will help in this case?
> 
> OR
> 
> As soon as other node joins the cluster it does not come into race of 
> becoming master but just join the cluster as a slave.
> 
> Any further pointers will be appreciated,
> 
> Thank you.
> 
> Regards,
> Jaikumar
> 
> Sent from Yahoo Mail on 
>
Android<https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrow

>
th_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowt
> h&af_sub3=EmailSignature>
> 
> On Mon, Jan 25, 2021 at 11:23, Sharma, Jaikumar
> <jaikumar‑sharma at outlook.com> wrote:
> _______________________________________________
> Manage your subscription:
> https://lists.clusterlabs.org/mailman/listinfo/users 
> 
> ClusterLabs home: https://www.clusterlabs.org/