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AIX server problem - network connection is unstable !


 
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Operating Systems AIX AIX server problem - network connection is unstable !
# 1  
Old 02-27-2020
AIX server problem - network connection is unstable !

Our company has just bought 2 IBM servers P8 - to make a Database Cluster. We've finished the installation progresses, but now there's a problem: the network connection is unstable - like this

Code:
sysopr1@ic_tsm:/home/sysopr1>ping 10.0.91.18
PING 10.0.91.18: (10.0.91.18): 56 data bytes
64 bytes from 10.0.91.18: icmp_seq=0 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=1 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=2 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=3 ttl=255 time=42 ms
64 bytes from 10.0.91.18: icmp_seq=4 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=5 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=6 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=7 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=8 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=9 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=10 ttl=255 time=48 ms
64 bytes from 10.0.91.18: icmp_seq=11 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=12 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=13 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=14 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=15 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=16 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=17 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=18 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=19 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=20 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=21 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=22 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=23 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=24 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=25 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=26 ttl=255 time=3 ms
64 bytes from 10.0.91.18: icmp_seq=27 ttl=255 time=0 ms
64 bytes from 10.0.91.18: icmp_seq=28 ttl=255 time=44 ms

We ping these two new servers from many servers with diffirences vlan, but it's always like that. This's really a big problem because the Oracle RAC requies the "time"" parametter must be <3.

Could someone help please ! Thanks

Moderator's Comments:
Mod Comment Code tags please, not Quotes, thanks

Last edited by vbe; 02-27-2020 at 07:24 AM..
# 2  
Old 02-27-2020
Hi,
We know nothing about your architecture, how can we reply?
# 3  
Old 02-27-2020
Ethernet, in the "old days", used to use a protocol called Carrier-sense multiple access with collision detection (CSMA/CD):

Either way, if you have many devices "talking" on the same LAN segment, it is normal for a packet to be delayed.

As vbe has mentioned (above), without the full details of your network topography and hosts; there is no way to answer your question accurately.

If you still need help, please post all the details so the experts here do not have to guess what you are doing.

Thanks.
# 4  
Old 02-28-2020
Code:
sysopr1@oltpn8c:/home/sysopr1>oslevel -s
6100-09-04-1441
sysopr1@oltpn8c:/home/sysopr1>prtconf|pg
prtconf: open: : No such device or address
System Model: IBM,9080-MME
Machine Serial Number: 7814C98
Processor Type: PowerPC_POWER8
Processor Implementation Mode: POWER 7
Processor Version: PV_7_Compat
Number Of Processors: 20
Processor Clock Speed: 4024 MHz
CPU Type: 64-bit
Kernel Type: 64-bit
LPAR Info: 1 78-14C98
Memory Size: 233216 MB
Good Memory Size: 233216 MB
Platform Firmware level: SC860_165
Firmware Version: IBM,FW860.51 (SC860_165)
Console Login: enable
Auto Restart: true
Full Core: false
NX Crypto Acceleration: No Data Available
 
Network Information
        Host Name: oltpn8c
        IP Address: 10.0.91.18
        Sub Netmask: 255.255.255.0
        Gateway: 10.0.91.1
        Name Server: 10.0.58.11
:[1] + Stopped (SIGTSTP)        prtconf|pg
sysopr1@oltpn8c:/home/sysopr1>ifconfig -a
en32: flags=1e080863,18c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),LARGESEND,CHAIN>
        inet 10.0.91.18 netmask 0xffffff00 broadcast 10.0.91.255
         tcp_sendspace 131072 tcp_recvspace 65536 rfc1323 0
en33: flags=1e080863,18c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),LARGESEND,CHAIN>
        inet 10.0.10.18 netmask 0xffffff00 broadcast 10.0.10.255
         tcp_sendspace 131072 tcp_recvspace 65536 rfc1323 0
en34: flags=1e080863,18c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),LARGESEND,CHAIN>
        inet 10.0.20.18 netmask 0xffffff00 broadcast 10.0.20.255
         tcp_sendspace 131072 tcp_recvspace 65536 rfc1323 0
en35: flags=1e080863,18c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),LARGESEND,CHAIN>
        inet 10.2.12.18 netmask 0xffffff00 broadcast 10.2.12.255
         tcp_sendspace 131072 tcp_recvspace 65536 rfc1323 0
en36: flags=1e080863,18c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),LARGESEND,CHAIN>
        inet 10.0.21.18 netmask 0xffffff00 broadcast 10.0.21.255
         tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
en37: flags=1e080863,18c0<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),LARGESEND,CHAIN>
        inet 10.0.22.18 netmask 0xffffff00 broadcast 10.0.22.255
         tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1
lo0: flags=e08084b,c0<UP,BROADCAST,LOOPBACK,RUNNING,SIMPLEX,MULTICAST,GROUPRT,64BIT,LARGESEND,CHAIN>
        inet 127.0.0.1 netmask 0xff000000 broadcast 127.255.255.255
        inet6 ::1%1/0
         tcp_sendspace 131072 tcp_recvspace 131072 rfc1323 1
sysopr1@oltpn8c:/home/sysopr1>netstat -nr
Routing tables
Destination        Gateway           Flags   Refs     Use  If   Exp  Groups

Route Tree for Protocol Family 2 (Internet):
default            10.0.91.1         UG        4   1221220 en32     -      -   
10.0.10.0          10.0.10.18        UHSb      0         0 en33     -      -   =>
10.0.10/24         10.0.10.18        U         3     67387 en33     -      -   
10.0.10.18         127.0.0.1         UGHS      0        17 lo0      -      -   
10.0.10.255        10.0.10.18        UHSb      0        56 en33     -      -   
10.0.20.0          10.0.20.18        UHSb      0         0 en34     -      -   =>
10.0.20/24         10.0.20.18        U         3  17607231 en34     -      -   
10.0.20.18         127.0.0.1         UGHS      0       558 lo0      -      -   
10.0.20.255        10.0.20.18        UHSb      0         1 en34     -      -   
10.0.21.0          10.0.21.18        UHSb      0         0 en36     -      -   =>
10.0.21/24         10.0.21.18        U         2     11333 en36     -      -   
10.0.21.18         127.0.0.1         UGHS      0     34069 lo0      -      -   
10.0.21.255        10.0.21.18        UHSb      2       312 en36     -      -   
10.0.22.0          10.0.22.18        UHSb      0         0 en37     -      -   =>
10.0.22/24         10.0.22.18        U         1    338564 en37     -      -   
10.0.22.18         127.0.0.1         UGHS      1       869 lo0      -      -   
10.0.22.255        10.0.22.18        UHSb      0        10 en37     -      -   
10.0.91.0          10.0.91.18        UHSb      0         0 en32     -      -   =>
10.0.91/24         10.0.91.18        U        16    726011 en32     -      -   
10.0.91.18         127.0.0.1         UGHS      0     97786 lo0      -      -   
10.0.91.255        10.0.91.18        UHSb      0         1 en32     -      -   
10.2.12.0          10.2.12.18        UHSb      0         0 en35     -      -   =>
10.2.12/24         10.2.12.18        U         0    157411 en35     -      -   
10.2.12.18         127.0.0.1         UGHS      0        93 lo0      -      -   
10.2.12.255        10.2.12.18        UHSb      0         1 en35     -      -   
127/8              127.0.0.1         U         9    684363 lo0      -      -   
192.168.213/24     10.0.20.1         UGS       1    103247 en34     -      -   
192.168.214/24     10.0.21.1         UGS       1     43510 en36     -      -   

Route Tree for Protocol Family 24 (Internet v6):
::1%1              ::1%1             UH        1    280956 lo0      -      -

We installed something like GPFS, Power Path, Oracle Server - but I think it's not the point. Whatever the network is - 10.0.91/24, 10.0.10/24, 10.0.22/24 ..., it's always unstable.
I know it would be hard to help with such these infomation, so let me know if you want to know more.
# 5  
Old 02-28-2020
You have only provided information about a single host. That is really not going to help us solving a network issue.

OK....

Start here, and post back the results of this on your host (above)

Code:
arp -a

Also, do you have login access to this IP:

Code:
10.0.91.1

# 6  
Old 02-28-2020
Code:
sysopr1@oltpn8c:/home/sysopr1>arp -a              
  client_gateway.agribank.com.vn (10.0.91.1) at 0:1c:7f:64:16:f [ethernet] stored in bucket 1

  ? (10.0.91.2) at 0:1c:7f:64:16:f [ethernet] stored in bucket 2

  ? (10.0.91.3) at 0:1c:7f:68:41:c3 [ethernet] stored in bucket 3

  ? (10.0.20.1) at 0:23:33:e1:0:da [ethernet] stored in bucket 3

  ? (10.0.10.29) at 0:14:5e:b8:8a:6e [ethernet] stored in bucket 4

  ? (10.0.22.236) at 0:11:25:7b:17:e [ethernet] stored in bucket 5

  ? (10.0.10.38) at 0:1a:64:91:5:ff [ethernet] stored in bucket 13

  oltpn5h (10.0.91.162) at e4:1f:13:50:35:85 [ethernet] stored in bucket 13

  ? (10.0.91.164) at 0:1a:64:a7:37:68 [ethernet] stored in bucket 15

  ? (10.0.10.42) at 0:14:5e:b8:8a:79 [ethernet] stored in bucket 17

  oltpn8c-vip (10.0.91.19) at 98:be:94:0:67:30 [ethernet] stored in bucket 19

  o10rac (10.0.21.66) at 6c:ae:8b:45:c4:90 [ethernet] stored in bucket 26

  ihapp8 (10.0.91.180) at 0:1a:64:1e:ea:d8 [ethernet] stored in bucket 31

  ihapp2 (10.0.91.182) at 0:21:5e:8a:d2:f8 [ethernet] stored in bucket 33

  ihapp3 (10.0.91.183) at 0:21:5e:8a:d5:18 [ethernet] stored in bucket 34

  ihapp4 (10.0.91.184) at 0:21:5e:8a:d3:6e [ethernet] stored in bucket 35

  ihapp5 (10.0.91.185) at 0:14:5e:b8:88:dc [ethernet] stored in bucket 36

  ? (10.0.10.61) at 0:14:5e:b8:63:f8 [ethernet] stored in bucket 36

  ih_ei (10.0.91.187) at 0:1a:64:1e:d0:f1 [ethernet] stored in bucket 38

  ? (10.2.12.199) at 98:be:94:74:8e:9a [ethernet] stored in bucket 42

  ? (10.0.91.50) at 0:1a:64:ad:50:a3 [ethernet] stored in bucket 50

  oltpn4c (10.0.91.62) at e4:1f:13:50:35:a7 [ethernet] stored in bucket 62

  oltpn10c (10.0.91.66) at 98:be:94:0:67:30 [ethernet] stored in bucket 66

  osb1.x.x.x (10.0.10.242) at 0:10:e0:3c:b8:62 [ethernet] stored in bucket 68

  o10gpfs (10.0.20.66) at 98:be:94:0:67:32 [ethernet] stored in bucket 68

  ? (10.0.10.250) at 98:be:94:23:20:da [ethernet] stored in bucket 76

  o9rac (10.0.21.119) at 34:80:d:66:41:8c [ethernet] stored in bucket 79

  icapp2 (10.0.91.82) at 0:21:5e:8a:9c:a [ethernet] stored in bucket 82

  icapp4 (10.0.91.84) at 0:1a:64:91:38:3f [ethernet] stored in bucket 84

  icapp5 (10.0.91.85) at 0:14:5e:b8:89:53 [ethernet] stored in bucket 85

  ic_ei (10.0.91.87) at 0:1a:64:1e:d0:21 [ethernet] stored in bucket 87

  ? (10.0.10.113) at 0:21:5e:8a:d0:20 [ethernet] stored in bucket 88

  ? (10.0.10.115) at 0:21:5e:8a:d2:8c [ethernet] stored in bucket 90

  misclient01.x.x.x (10.0.91.91) at 0:10:e0:3b:6b:4d [ethernet] stored in bucket 91

  ? (10.0.10.117) at 0:21:5e:8a:d0:16 [ethernet] stored in bucket 92

  ? (10.0.10.119) at 0:14:5e:b8:88:d1 [ethernet] stored in bucket 94

  ? (10.0.22.38) at 0:11:25:7b:26:7e [ethernet] stored in bucket 105

  ? (10.0.21.1) at 0:23:33:e1:0:da [ethernet] stored in bucket 110

  ? (10.0.10.135) at 0:1a:64:91:3c:c4 [ethernet] stored in bucket 110

  o5mgt (10.0.10.137) at e4:1f:13:50:36:56 [ethernet] stored in bucket 112

  oltpn9h (10.0.91.119) at 0:90:fa:d8:de:b [ethernet] stored in bucket 119

  o9gpfs (10.0.20.119) at 0:90:fa:d8:de:12 [ethernet] stored in bucket 121

  ? (10.0.21.38) at 0:11:25:7b:22:a3 [ethernet] stored in bucket 147

bucket:    0     contains:    0 entries
bucket:    1     contains:    1 entries
bucket:    2     contains:    1 entries
bucket:    3     contains:    2 entries
bucket:    4     contains:    1 entries
bucket:    5     contains:    1 entries
bucket:    6     contains:    0 entries
bucket:    7     contains:    0 entries
bucket:    8     contains:    0 entries
bucket:    9     contains:    0 entries
bucket:   10     contains:    0 entries
bucket:   11     contains:    0 entries
bucket:   12     contains:    0 entries
bucket:   13     contains:    2 entries
bucket:   14     contains:    0 entries
bucket:   15     contains:    1 entries
bucket:   16     contains:    0 entries
bucket:   17     contains:    1 entries
bucket:   18     contains:    0 entries
bucket:   19     contains:    1 entries
bucket:   20     contains:    0 entries
bucket:   21     contains:    0 entries
bucket:   22     contains:    0 entries
bucket:   23     contains:    0 entries
bucket:   24     contains:    0 entries
bucket:   25     contains:    0 entries
bucket:   26     contains:    1 entries
bucket:   27     contains:    0 entries
bucket:   28     contains:    0 entries
bucket:   29     contains:    0 entries
bucket:   30     contains:    0 entries
bucket:   31     contains:    1 entries
bucket:   32     contains:    0 entries
bucket:   33     contains:    1 entries
bucket:   34     contains:    1 entries
bucket:   35     contains:    1 entries
bucket:   36     contains:    2 entries
bucket:   37     contains:    0 entries
bucket:   38     contains:    1 entries
bucket:   39     contains:    0 entries
bucket:   40     contains:    0 entries
bucket:   41     contains:    0 entries
bucket:   42     contains:    1 entries
bucket:   43     contains:    0 entries
bucket:   44     contains:    0 entries
bucket:   45     contains:    0 entries
bucket:   46     contains:    0 entries
bucket:   47     contains:    0 entries
bucket:   48     contains:    0 entries
bucket:   49     contains:    0 entries
bucket:   50     contains:    1 entries
bucket:   51     contains:    0 entries
bucket:   52     contains:    0 entries
bucket:   53     contains:    0 entries
bucket:   54     contains:    0 entries
bucket:   55     contains:    0 entries
bucket:   56     contains:    0 entries
bucket:   57     contains:    0 entries
bucket:   58     contains:    0 entries
bucket:   59     contains:    0 entries
bucket:   60     contains:    0 entries
bucket:   61     contains:    0 entries
bucket:   62     contains:    1 entries
bucket:   63     contains:    0 entries
bucket:   64     contains:    0 entries
bucket:   65     contains:    0 entries
bucket:   66     contains:    1 entries
bucket:   67     contains:    0 entries
bucket:   68     contains:    2 entries
bucket:   69     contains:    0 entries
bucket:   70     contains:    0 entries
bucket:   71     contains:    0 entries
bucket:   72     contains:    0 entries
bucket:   73     contains:    0 entries
bucket:   74     contains:    0 entries
bucket:   75     contains:    0 entries
bucket:   76     contains:    1 entries
bucket:   77     contains:    0 entries
bucket:   78     contains:    0 entries
bucket:   79     contains:    1 entries
bucket:   80     contains:    0 entries
bucket:   81     contains:    0 entries
bucket:   82     contains:    1 entries
bucket:   83     contains:    0 entries
bucket:   84     contains:    1 entries
bucket:   85     contains:    1 entries
bucket:   86     contains:    0 entries
bucket:   87     contains:    1 entries
bucket:   88     contains:    1 entries
bucket:   89     contains:    0 entries
bucket:   90     contains:    1 entries
bucket:   91     contains:    1 entries
bucket:   92     contains:    1 entries
bucket:   93     contains:    0 entries
bucket:   94     contains:    1 entries
bucket:   95     contains:    0 entries
bucket:   96     contains:    0 entries
bucket:   97     contains:    0 entries
bucket:   98     contains:    0 entries
bucket:   99     contains:    0 entries
bucket:  100     contains:    0 entries
bucket:  101     contains:    0 entries
bucket:  102     contains:    0 entries
bucket:  103     contains:    0 entries
bucket:  104     contains:    0 entries
bucket:  105     contains:    1 entries
bucket:  106     contains:    0 entries
bucket:  107     contains:    0 entries
bucket:  108     contains:    0 entries
bucket:  109     contains:    0 entries
bucket:  110     contains:    2 entries
bucket:  111     contains:    0 entries
bucket:  112     contains:    1 entries
bucket:  113     contains:    0 entries
bucket:  114     contains:    0 entries
bucket:  115     contains:    0 entries
bucket:  116     contains:    0 entries
bucket:  117     contains:    0 entries
bucket:  118     contains:    0 entries
bucket:  119     contains:    1 entries
bucket:  120     contains:    0 entries
bucket:  121     contains:    1 entries
bucket:  122     contains:    0 entries
bucket:  123     contains:    0 entries
bucket:  124     contains:    0 entries
bucket:  125     contains:    0 entries
bucket:  126     contains:    0 entries
bucket:  127     contains:    0 entries
bucket:  128     contains:    0 entries
bucket:  129     contains:    0 entries
bucket:  130     contains:    0 entries
bucket:  131     contains:    0 entries
bucket:  132     contains:    0 entries
bucket:  133     contains:    0 entries
bucket:  134     contains:    0 entries
bucket:  135     contains:    0 entries
bucket:  136     contains:    0 entries
bucket:  137     contains:    0 entries
bucket:  138     contains:    0 entries
bucket:  139     contains:    0 entries
bucket:  140     contains:    0 entries
bucket:  141     contains:    0 entries
bucket:  142     contains:    0 entries
bucket:  143     contains:    0 entries
bucket:  144     contains:    0 entries
bucket:  145     contains:    0 entries
bucket:  146     contains:    0 entries
bucket:  147     contains:    1 entries
bucket:  148     contains:    0 entries

There are 43 entries in the arp table.



Quote:
Also, do you have login access to this IP:
- I don''t get you - 10.0.91.1 is default gateway

More infomation : GPFS 3.3, Oracle Database 11g Enterprise Edition Release 11.2.0.4.7 - 64bit Production ; GPFS: 6 node cluster ( we have 4 node initially, 2 new node have just been added recently ), and we found something unnormal - there's an ent with PROMISC mode in one node - but we don't know for sure
Code:
en36: flags=1e084963,18c0<UP,BROADCAST,NOTRAILERS,RUNNING,PROMISC,SIMPLEX,MULTICAST,GROUPRT,64BIT,CHECKSUM_OFFLOAD(ACTIVE),LARGESEND,CHAIN>
        inet 10.0.21.119 netmask 0xffffff00 broadcast 10.0.21.255
        inet 169.254.186.79 netmask 0xffff0000 broadcast 169.254.255.255
         tcp_sendspace 262144 tcp_recvspace 262144 rfc1323 1

# 7  
Old 02-28-2020
Yes, I know - - 10.0.91.1 is default gateway

I asked you if you can log into it? Was this not clear, when I asked you?

Quote:
Also, do you have login access to this IP?
Regarding your arp it looks fairly clear to me that you have a lot of devices on this ethernet segment.

When you have many devices on the same segment, sometimes packets will be delayed. That is now networking works.

If you want it to be "very fast and always the higher priority" you should put only the two devices on that network segment.

This seems really basic. What am I missing? Tell me.

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Hi , when i try to passwordless connection login in ssh through putty, i am getting the "Server unexpectedly closed network connection" error.i have already finished the public and private key settings for the particular user. thanks MaroV (1 Reply)
Discussion started by: vr_mari
1 Replies

8. Cybersecurity

Enable SSH for root over certain network connection of a server...is it possible?

Hi - I have a SUSE Enterprise Linux Server V9 that I have an issue with. Policy says that root connectivity via ssh needs to be disabled. So, to do that, I made the following change in the sshd_config section: # Authentication: #LoginGraceTime 2m #PermitRootLogin yes PermitRootLogin no... (3 Replies)
Discussion started by: cpolikowsky
3 Replies

9. UNIX for Dummies Questions & Answers

Network connection problem in unix

I have a network connection problem in unix. I am trying to access to LAN in unix but unfortunately it doesn't work. For example, if I ping from Unix to windows it says 'the network is unreacable'. Also, I can't ping in windows to unix. I would be glad if someone could help me. Thanks. ... (5 Replies)
Discussion started by: fatihshen
5 Replies

10. UNIX for Dummies Questions & Answers

FTP connection problem on new server

Solaris Server (V880) version 8 Brand new box just installed O/S, what do I need to do in order to get FTP working. I have updated the /etc/hosts.equiv file Problem - When trying to ftp to the server I get a login incorrect message, this is with the root user. Are there some... (1 Reply)
Discussion started by: miredale
1 Replies

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