<div dir="ltr"><div>I'm a Lustre newbie who just joined this list. I'd appreciate any help on the following Lustre 2.4 issue I'm running into:</div><div></div><div>Every time I mount the MDT, the mount appears to succeed but /var/log/messages contains the message: "LustreError: 11-0: lustre-MDT0000-lwp-MDT0000: Communicating with 0@lo, operation mds_connect failed with -11". The MDT uses 4 local drives in a RAID10 configuration. Each OSS has their own RAID10 of 36 drives each. The OSS's mount correctly without any errors.</div>
<div></div><div></div><div>I've seen this error mentioned in countless Google searches. One obscure reply suggested this was a problem fixed in 2.5. All other references were with respect to pre-2.4 releases where the message indicated there was probably an error somewhere in the connection's configuration.</div>
<div></div><div>Is this a real error? I see the code that probably generates this inclient.c. In abbreviated form, the code is:</div><div>LCONSOLE_ERROR_MSG(0x11, "%s Communicating with %s") in ptlrpc_check_status(). There's another in mdt_obd_connect() where -EAGAIN [set to -11 in lustre_errno.h) is returned if the stack isn't ready to handle requests as indicated by the return code from obd_health_check().</div>
<div></div><div>My environment is this:</div><div>MDT, OSS0, and OSS1 are all on 3 separate nodes running Centos 6.4 and connected by Infiniband Mellanox HBAs. Running this in a VM with the MDT and a single OSS on one node in a VM using TCP did not exhibit this problem.</div>
<div></div><div>Thanks in advance for any help you can provide.</div><div></div><div>Michael</div></div>