DataCopy copy or secondary copy from QoreStor to tape library fails with “Slave [xxxx] still running error for Channel Down” error in binary log.
Netvault server or client that is running the DataCopy or secondary copy to tape is has underlying Linux operating system. This problem has not been seen on windows server or client.
On investigation of the subtext of this error we see “NetTcpReceive returned unknown error 12” followed by “MsgChannelDown”. This is also seen in the DataCopy plugin trace.
On investigation of the DataCopy slave process trace we see “Instance count is zero” and “Terminating library” just before the DataCopy slave process crashes. The QoreStor device is closed.
We should see core dump file similar to example below written to …/netvault/bin folder unless the system has been configured to store core dumps in another location by administrative user. If this is the situation we would need to ask administrative user to supply location of core dumps.
core.nvdatacpyslave.0.001a834aed8e47ad91a514f7d2db9fb2.40890.1584425833000000
Binary log extract including error subtext
Error 2020/07/02 15:06:09 76 Data Plugin nvserver MSDataCopy Master: Slave [1979] still running error for Channel Down
4 NET :55144 84 0 150629.677417 Connection reset
4 NET :55144 16 0 150629.677422 12 = NetTcpReceive(0x7ffd22b56240, Length=16(-1), Socket=4, Buffer=0x1660bf0(192))
3 MESSAGE :55144 53 0 150629.677429 NetTcpReceive returned unknown error 12
4 MESSAGE :55144 45 0 150629.677433 MsgChannelDown(0x1660b60) 4
DataCopy plugin trace extract
4 NET :55144 84 0 150629.677417 Connection reset
4 NET :55144 16 0 150629.677422 12 = NetTcpReceive(0x7ffd22b56240, Length=16(-1), Socket=4, Buffer=0x1660bf0(192))
3 MESSAGE :55144 53 0 150629.677429 NetTcpReceive returned unknown error 12
4 MESSAGE :55144 45 0 150629.677433 MsgChannelDown(0x1660b60) 4
DataCopy slave process trace extract
4 DRV2LAYE:174420 57 0 150628.869877 RDA2CloseConnection(0x1d970c0)
4 DRV2LAYE:174420 58 0 150628.869883 About to close device 0x301f8d0
4 DRV2LAYE:174420 59 0 150629.282426 device has been closed. device value = 0x301f8d0
4 DRLAYER :174420 15 0 150629.282456 RDAShutdownLibrary(0x1d95fb0)
4 DRLAYER :174420 17 0 150629.282480 Instance count is zero
4 DRLAYER :174420 18 0 150629.282519 Terminating library
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