Sudden application crash in servers Post: 303009780

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Operating Systems HP-UX Sudden application crash in servers Post 303009780 by anaigini45 on Tuesday 19th of December 2017 10:06:00 PM

12-19-2017

Registered User

Hi,

Thanks all for the tons of replies and suggestions.

Quote:

Possibly the system has run out of network buffer resources. Has the load/number of users been steadily increasing?

Network configurations determine the number of buffers available for network packets (of various different sizes) arriving and departing, and also the maximum number of connections.

Could be possible that the load/number of users steadily increased.
Network configurations in this sense means? Which file?
Maximum connections you mean maximum ssh connections allowed? I believe it is still at the system default which is 60.
A week or 2 earlier, there were few occurrences of where users were not able to login into the server due to too many ssh connections from one user which had root (0) privilege.

Quote:

You need to tell us all what hardware this is, what O/S you are running and which version. Give us a clue!!

Machine model : HP RX7640 ia64
OS version : HPUX B11.23
CPU : 4 Physical, 8 Core
Memory : 128 G

I am not aware of any security scanning devices used in the server.

There was nothing in particular happening in the server at the time of the crash.

anaigini45

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LEARN ABOUT CENTOS

ucmatose

UCMATOSE(1)							     librdmacm							       UCMATOSE(1)

NAME

       ucmatose - RDMA CM connection and simple ping-pong test.

SYNOPSIS

       ucmatose [-s server_address] [-b bind_address] [-c connections]
		 [-C message_count] [-S message_size]
       ucmatose -s server_address [-b bind_address] [-c connections]
		 [-C message_count] [-S message_size] [-t tos]

DESCRIPTION

       Establishes  a  set  of	reliable RDMA connections between two nodes using the librdmacm, optionally transfers data between the nodes, then
       disconnects.

OPTIONS

       -s server_address
	      The network name or IP address of the server system listening for connections.  The used name or address must  route  over  an  RDMA
	      device.  This option must be specified by the client.

       -b bind_address
	      The local network address to bind to.

       -c connections
	      The number of connections to establish between the client and server.  (default 1)

       -C message_count
	      The number of messages to transfer over each connection.	(default 10)

       -S message_size
	      The size of each message transferred, in bytes.  (default 100)

       -t tos Indicates  the  type  of service used for the communication.  Type of service is implementation dependent based on subnet configura-
	      tion.

       -m     Tests event channel migration.  Migrates all communication identifiers to a different event channel for disconnect events.

NOTES

       Basic usage is to start ucmatose on a server system, then run ucmatose -s server_name on a client system.

       Because this test maps RDMA resources to userspace, users must ensure that they have available system resources and permissions.   See  the
       libibverbs README file for additional details.

SEE ALSO

       rdma_cm(7), udaddy(1), mckey(1), rping(1)

librdmacm							    2007-05-15							       UCMATOSE(1)