[lustre-discuss] [EXTERNAL] OST mount with failover MDS
Mohr, Rick
mohrrf at ornl.gov
Tue Mar 23 06:58:36 PDT 2021
Could this be due to the fact that the IP for the primary host is 10.20.3.0? I don't know what your netmask is, so I don't know if that is a valid host IP address. Or maybe since it looks like a network address, Lustre is not using it as a host address?
-Rick
On 3/17/21, 7:57 AM, "lustre-discuss on behalf of Thomas Roth via lustre-discuss" <lustre-discuss-bounces at lists.lustre.org on behalf of lustre-discuss at lists.lustre.org> wrote:
Hi all,
I wonder if I am seeing signs of network problems when mounting an OST:
tunefs.lustre --dryrun tells me (what I know from my own format command)
>Parameters: mgsnode=10.20.3.0 at o2ib5:10.20.3.1 at o2ib5
These are the nids for our MGS+MDT0, there are two more pairs for MDT1 and MDT2.
I went step-by-step, modprobing lnet and lustre, and checking LNET by 'lnet ping' to the active MDTs,
which worked fine.
However, mounting such an OST (e.g. after a crash) at first prints a number of
> LNet: 19444:0:(o2iblnd_cb.c:3397:kiblnd_check_conns()) Timed out tx for 10.20.3.1 at o2ib5: 0 seconds
and similarly for the failover partners of the other two MDS.
Should it do that?
Imho, LNET to a failover node _must_ fail, because LNET should not be up on the failover node, right?
If I started LNET there, and some client does not get an answer quickly enough from the acting MDS, it
would try the failover, LNET yes but Lustre no - that doesn't sound right.
Regards,
Thomas
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