[Lustre-discuss] lctl ping of Pacemaker IP

[Jeff Johnson]

Megan,

lnet pings aren't the same as tcpip/udp pings. An lnet ping 'lctl ping' would need to touch an active lnet instance on the target address. I don't think you can bind lnet to a pacemaker virtual IP but I'll let someone smarter than me on this list confirm or correct me.

In any event an lnet ping and udp ping are completely separate animals.

--Jeff

Sent from my iPhone

On Nov 1, 2012, at 21:04, "Ms. Megan Larko" <dobsonunit at gmail.com> wrote:

> Greetings!
> 
> I am working with Lustre-2.1.2 on RHEL 6.2.  First I configured it
> using the standard defaults over TCP/IP.   Everything worked very
> nicely usnig a real, static --mgsnode=a.b.c.x value which was the
> actual IP of the MGS/MDS system1 node.
> 
> I am now trying to integrate it with Pacemaker-1.1.7.    I believe I
> have most of the set-up completed with a particular exception.  The
> "lctl ping" command cannot ping the pacemaker IP alias (say a.b.c.d).
> The generic ping command in RHEL 6.2 can successfully access the
> interface.  The Pacemaker alias IP (for failover of the combnied
> MGSMDS node with Fibre Channel multipath storage shared between both
> MGS/MDS-configured machines)  works in and of itself.  I tested with
> an apache service.   The Pacemaker will correctly fail over the
> MGS/MDS from system1 to system2 properly.  If I go to system2 then my
> Lustre file system stops because it cannot get to the alias IP number.
> 
> I did configure the lustre OSTs to use --mgsnode=a.b.c.d (a.b.c.d
> representing my Pacemaker IP alias).  A tunefs.lustre confirms the
> alias IP number.  The alias IP number does not appear in LNET (lctl
> list_nids), and "lctl ping a.b.c.d" fails.
> 
> Should this IP alias go into the LNET data base?  If yes, how?   What
> steps should I take to generate a successful "lctl ping a.b.c.d"?
> 
> Thanks for reading!
> Cheers,
> megan
> _______________________________________________
> Lustre-discuss mailing list
> Lustre-discuss at lists.lustre.org
> http://lists.lustre.org/mailman/listinfo/lustre-discuss