[Lustre-discuss] RHEL54 / Lustre mds_getxattr -95 errors

CHU, STEPHEN H (ATTSI) sc1680 at att.com
Tue Jan 18 06:39:18 PST 2011

Hi all,


I recently loaded the following on my testbed to try out Lustre 2.0:

*        One MDS - RHEL 54, Lustre 2.0

o   mkfs.lustre --fsname=lufs --reformat --mgs --mdt --param
lov.stripesize=25M --param lov.stripecount=1 /dev/sda2

o   /etc/fstab = /dev/sda2       /lustre1-mgs-mds                lustre
rw,noauto,_netdev  0 0

*        One OSS - RHEL 54, Lustre 2.0

o   mkfs.lustre --fsname=lufs --reformat --ost
--mgsnode= at o2ib0 /dev/sdb

o   mkfs.lustre --fsname=lufs --reformat --ost
--mgsnode= at o2ib0 /dev/sdc

o   /etc/fstab = /dev/sdb        /lustre1/ost1         lustre
rw,noauto,_netdev  0 0

o                          /dev/sdc        /lustre1/ost2         lustre
rw,noauto,_netdev  0 0

*        One Client - RHEL 54, Lustre 2.0

o   /etc/fstab = at o2ib0:/lufs       /lustre1_fifo
lustre  rw,noauto,_netdev  0 0


/lustre-mgs-mds, /lustre1/ost1,2 mounted OK on MDS and OSS.
/lustre1_fifo mounted OK with Client. So far so good.


On Client, "cd /" and performed a "ls -l". The following messages
immediately showed up:

*        On Client

o    Jan 18 14:04:19 bg8mo33sn kernel: LustreError: 11-0: an error
occurred while communicating with at o2ib. The mds_getxattr
operation failed with -95

*        On MDS

o   Jan 18 14:04:19 bg8mo33lm kernel: LustreError:
20056:0:(ldlm_lib.c:2123:target_send_reply_msg()) @@@ processing error
(-95)  req at ffff81031427e050 x1357944885151537/t0(0)
o49->af4d23bf-2d42-6e4d-6afc-353425e513af at NET_0x500000a672229_UUID:0/0
lens 448/328 e 0 to 0 dl 1295359465 ref 1 fl
Interpret:/ffffffff/ffffffff rc -95/-1


All IBs between all nodes are alive and seeing each other with no


The client also NFS exports /lustre1_fifo via:

*        /etc/exports = /lustre1_fifo


After testhost1 mounted /lustre1_fifo and attempt to "mkdir test" under
it, the same error messages from above showed up on the MDS and the
client. "-95" as "Operation not supported on transport endpoint" but
what does it mean here in this context.


The same MDS/OSS/Client setup/arrangements ran fine on RHEL 5.3 and
Lustre with no errors.


Appreciate any help/insight. Thanks.




Stephen Chu



200 Laurel Ave

Middletown, NJ

(732) 420-0588

stephenchu at att.com

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