[Lustre-discuss] lctl ping of Pacemaker IP

Jeff Johnson jeff.johnson at aeoncomputing.com
Thu Nov 1 21:47:36 PDT 2012


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.


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
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