Dear lustre experts.
I detect a serious interoperability problem between lustre 2.8 server
side and lustre 2.9 clients:
We have a lustre 2.8 on mgs/mds and oss's and lustre 2.8 clients.
Yesterday I update a couple of clients to lustre 2.9 and I detect that
this clients cannot read a lot of files of our lustre filesystem. The
outputs when we try to read several files is the following:
[root@turing lustre-2.9.0_el7_client]# lfs getstripe
/mnt/lustre/users/cgabarro/L3_cadena_interna/comparacio_SSSL2_ARGO/filter_case_3/TOT_results_SMOS_argo_filter_v3_20110221_20110302.dat
error opening
/mnt/lustre/users/cgabarro/L3_cadena_interna/comparacio_SSSL2_ARGO/filter_case_3/TOT_results_SMOS_argo_filter_v3_20110221_20110302.dat:
No such file or directory (2)
llapi_semantic_traverse: Failed to open
'/mnt/lustre/users/cgabarro/L3_cadena_interna/comparacio_SSSL2_ARGO/filter_case_3/TOT_results_SMOS_argo_filter_v3_20110221_20110302.dat':
No such file or directory (2)
error: getstripe failed for
/mnt/lustre/users/cgabarro/L3_cadena_interna/comparacio_SSSL2_ARGO/filter_case_3/TOT_results_SMOS_argo_filter_v3_20110221_20110302.dat
As you can see in other clients with lustre 2.8 clients there is no
problem to read this file:
[root@gaia ~]# lfs getstripe
/mnt/lustre/users/cgabarro/L3_cadena_interna/comparacio_SSSL2_ARGO/filter_case_3/TOT_results_SMOS_argo_filter_v3_20110221_20110302.dat
/mnt/lustre/users/cgabarro/L3_cadena_interna/comparacio_SSSL2_ARGO/filter_case_3/TOT_results_SMOS_argo_filter_v3_20110221_20110302.dat
lmm_stripe_count: 1
lmm_stripe_size: 1048576
lmm_pattern: 1
lmm_layout_gen: 2
lmm_stripe_offset: 3
obdidx objid objid group
3 5235570 0x4fe372 0
This problem only happens with lustre 2.9 clients and there is no errors
in the oss and mds/mgs servers. I see that this problems only happens
when I read some files, not all files, from some ldiskfs ost's.
After downgrade to 2.8 lustre the clients we cannot reproduce this problem.
Regards.
--
=============================================
Fernando Pérez
Institut de Ciències del Mar (CMIMA-CSIC)
Departament Oceanografía Física i Tecnològica
Passeig Marítim de la Barceloneta,37-49
08003 Barcelona
Phone: (+34) 93 230 96 35
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