[Lustre-discuss] IMP_INVALID -- one change that worked

[megan]

Our CentOS 5 2.6.18-53.1.13.el5_lustre.1.6.4.3smp OSS client was
giving us trouble.  The /var/log/messages file would frequently have
the text:
Jun 29 17:49:27 oss2 kernel: LustreError: 2565:0:(client.c:
519:ptlrpc_import_delay_req()) @@@ IMP_INVALID  req at ffff810077ef4000
x82828/t0 o101->MGS at MGC172.18.0.10@o2ib_0:26 lens 232/240 ref 1 fl
Rpc:/0/0 rc 0/0
Jun 29 17:49:27 oss2 kernel: LustreError: 2565:0:(client.c:
519:ptlrpc_import_delay_req()) Skipped 59 previous similar messages
Jun 29 18:00:08 oss2 kernel: LustreError: 2565:0:(client.c:
519:ptlrpc_import_delay_req()) @@@ IMP_INVALID  req at ffff810077f34400
x82888/t0 o101->MGS at MGC172.18.0.10@o2ib_0:26 lens 232/240 ref 1 fl
Rpc:/0/0 rc 0/0
Jun 29 18:00:08 oss2 kernel: LustreError: 2565:0:(client.c:
519:ptlrpc_import_delay_req()) Skipped 59 previous similar messages

Last week I connected a new InfiniBand cable between the OSS box and
the IB switch.   I have not had an IMP_INVALID error in the /var/log/
messages file since then.  I don't know how a cable can work and then
not work, but in this example, changing the cable stopped the Lustre
errors from appearing.

megan