Mountd problem in 5.3


 
Thread Tools Search this Thread
Operating Systems AIX Mountd problem in 5.3
# 1  
Old 08-04-2014
Mountd problem in 5.3

Dear all,

I'm troubleshooting some problem with NFS server, mountd to be precise. Server is running AIX 5.3. When NFS starts, mountd listens both on TCP and UDP ports:
Code:
rpcinfo -p | grep mountd
    100005    1   tcp   6666  mountd
    100005    2   tcp   6666  mountd
    100005    3   tcp   6666  mountd
    100005    1   udp   6666  mountd
    100005    2   udp   6666  mountd
    100005    3   udp   6666  mountd

Port 6666 is fixed in /etc/services. After the start server works fine, clients can mount exported directories without any issues. After some time (not sure how long, perhaps after some idle period) mountd stops listening on TCP and only UDP remains:
Code:
 rpcinfo -p | grep mountd
    100005    1   udp   6666  mountd
    100005    2   udp   6666  mountd
    100005    3   udp   6666  mountd

The problem is that clients still try to contact TCP port first, despite the fact (I can see that in network trace) that portmap says TCP program is not available. Such requests are retransmitted until they timeout and there is 2 min delay in service because of such retransmits. After timeout client tries UDP port and everything goes fine. Roughly speaking, network conversation goes like this:
Code:
Client: GETPORT Call MOUNT TCP
Server: GETPORT Reply PROGRAM_NOT_AVAILABLE
Client: GETPORT Call MOUNT UDP
Server: GETPORT Reply Port: 6666
<...some communication ongoing...>
Client: sends SYN to TCP port 6666
Client: resend SYN
Client: resend SYN
....
Timeout
Client: GETPORT Call MOUNT UDP
Server: GETPORT Reply Port: 6666
Client: MNT Call
...and everything goes ok...

Any ideas why mountd stops listening on TCP? Of course, there is another issue with clients who insist on TCP and ignores answers from portmap, but I thought I'll start with server side. In fact, I tried to read a bit about such client behaviour, too, but found nothing.
# 2  
Old 08-04-2014
The description of your problem lacks a few (IMHO necessary) details: which NFS version do you use? If i remember correctly NFSv2 uses UDP, NFSv3 uses TCP. This is why you have to explicitly state which NFS version the share should be exported with.

If you use NFSv4 you need to specify your NFS-domain in addition. I usually set it to the same name as the DNS-domain, but its content doesn't really matter as long as it is set at all and its content is consistent between NFS-server and -clients.

Please post (a significant part of) the content of /etc/exports.

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
# 3  
Old 08-05-2014
NFSv3 is used and version is stated explicitly on client side. I also tried to specify protocol (TCP or UDP) in client options, but it doesn't change anything. On server side we do not specify neither version, nor protocol. As I understand from docs, if version is not explicitly stated, server should work both with v2 and v3.

Entries in
Code:
/etc/exports

are quite simple, such as:

Code:
/test -rw,root=host1,access=host1

only lists of hosts differ.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. IP Networking

Router problem or ISP problem ?

Hi everyone, I am experiencing discontinuity of Internet service, this started 1 month ago. Everything worked very well for 1 year of intensive use, but now, I have problems reaching my gateway. The gateway is not my router but a node belonging to my ISP and I share the same public IP with... (3 Replies)
Discussion started by: remic
3 Replies

2. UNIX for Dummies Questions & Answers

sed Or Grep Problem OR Terminal Problem?

I don't know if you guys get this problem sometimes at Terminal but I had been having this problem since yesterday :( Maybe I overdid the Terminal. Even the codes that used to work doesn't work anymore. Here is what 's happening: * I wanted to remove lines containing digits so I used this... (25 Replies)
Discussion started by: Nexeu
25 Replies

3. IP Networking

Problem with forwarding emails (SPF problem)

Hi, This is rather a question from a "user" than from a sys admin, but I think this forum is apropriate for the question. I have an adress with automatic email forwarding and for some senders (two hietherto), emails are bouncing. This has really created a lot of problems those two time so I... (0 Replies)
Discussion started by: carwe
0 Replies

4. Homework & Coursework Questions

about mountd daemon ?

Manually we can stop the daemon by stopsrc command other-than this In which case mountd daemon will crash automatically. (1 Reply)
Discussion started by: t.balamurugan
1 Replies

5. AIX

AIX OS problem? network problem?

Dear ALL. I installed AIX OS on customer sites. but Only one site is too slow when I connected telnet, ftp.. Ping is too fast. but telnet and FTP is not connected.. of course i check the configuration file on aix but it's normal. Do any Idea?? thanks in advance. - Jun - (3 Replies)
Discussion started by: Jeon Jun Seok
3 Replies

6. UNIX for Dummies Questions & Answers

DHCP problem and eth1 problem

At work I am trying to get this one Linux machine (let's call it ctesgm07) to behave like another Linux machine that we have (let's call it test007). test007 returns the following version info: cat /etc/debian_version: lenny/sid uname -a: Linux test007 2.6.27-7-generic #1 SMP Tue Nov 4... (0 Replies)
Discussion started by: sllinux
0 Replies

7. Red Hat

Mail Problem. Maybe, it is a DNS Problem!

Hi, i've a redhat linux 9 upadated by redhat from 7 version to 9 version. A couple of days ago i was a problem with my mail, in other words i'm not able to get any email nor to send any email. I've a proxy configuration and i tried to set iptables in order to verify the port. The 110,255 and 995... (1 Reply)
Discussion started by: pintalgi
1 Replies

8. AIX

user login problem & Files listing problem.

1) when user login to the server the session got colosed. How will resolve? 2) While firing the command ls -l we are not able to see the any files in the director. but over all view the file system using the command df -g it is showing 91% used. what will be the problem? Thanks in advance. (1 Reply)
Discussion started by: pernasivam
1 Replies

9. Shell Programming and Scripting

ssh script problem problem

Hi Please help me with the following problem with my script. The following block of code is not repeating in the while loop and exiting after searching for first message. input_file ========== host001-01 host001-02 2008-07-23 13:02:04,651 ConnectionFactory - Setting session state... (2 Replies)
Discussion started by: pcjandyala
2 Replies

10. Shell Programming and Scripting

problem with dd command or maybe AFS problem

Hi, folks. Sorry for bothering, but maybe someone could help me please. The problem is the following: there is some script that copies files from local file system to AFS. The copying is performed with dd command. The script copies data into some AFS volumes. The problem appeared with one... (0 Replies)
Discussion started by: Anta
0 Replies
Login or Register to Ask a Question