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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