Hello, this is my first post on this list, I hope someone can give me some advise on how to resolve the following issue.
I'm using the lustre release 2.4.0 RC2 compiled from whamcloud sources, this is an upgrade from lustre 2.2.22 from same sources. The situation is: There are several clients reading files that belongs mostly to the same OST, afther a period of time the clients starts loosing contact with this OST and processes stops due to this fault, here is the state for such OST on one client: client# lfs check servers ... ... lustre-OST000a-osc-ffff8801bc548000: check error: Resource temporarily unavailable ... ... checking dmesg on client and OSS server we have: client# dmesg LustreError: 11-0: lustre-OST000a-osc-ffff8801bc548000: Communicating with 10.2.2.3@o2ib, operation ost_connect failed with -16. LustreError: Skipped 24 previous similar messages OSS-server# dmesg .... Lustre: lustre-OST000a: Client 0afb2e4c-d870-47ef-c16f-4d2bce6dabf9 (at 10.2.64.4@o2ib) reconnecting Lustre: lustre-OST000a: Client 0afb2e4c-d870-47ef-c16f-4d2bce6dabf9 (at 10.2.64.4@o2ib) refused reconnection, still busy with 9 active RPCs .... At this moment I can ping from client to server and vice versa, but some time this call also hangs on server and client. client# # lctl ping OSS-server@o2ib 12345-0@lo 12345-OSS-server@o2ib OSS-server# lctl ping 10.2.64.4@o2ib 12345-0@lo 12345-10.2.64.4@o2ib This situation happens very frequently and specially with jobs that process a lot of files in an average size of 100MB. The only solution that I find to reestablish the communication between the server and the client is restarting both machines. I hope some have an idea what is the reason for the problem and how can I reset the communication with the clients without restarting the machines. thank you, Eduardo UNAM@Mexico -- Eduardo Murrieta Unidad de Cómputo Instituto de Ciencias Nucleares, UNAM Ph. +52-55-5622-4739 ext. 5103
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