Quest on NFS with 1 Server & 2 Clients Post: 302607712

Sponsored Content

Top Forums UNIX for Advanced & Expert Users Quest on NFS with 1 Server & 2 Clients Post 302607712 by SolarMax on Thursday 15th of March 2012 06:29:11 AM

03-15-2012

Registered User

Quest on NFS with 1 Server & 2 Clients

Hello;

I work now with a team which has based her "applications" on the following schema:

1 NFS client C1 (linux redhat 5) writes a file fic.dat on a NFS SERVER S (RH 5)
Another NFS client C2 is waiting for the same file fic.dat (on NFS server S1), and, when "fic.dat" appears, then makes process on this file (it is resumed only).
All machines (C1,C2 and S) work in NFS V3 only.

My first question is: what is the name of this special mode of operation with 3 machines and not only 1 Client and 1 Server as usual?

My second question is about performances witch are very bad. The file fic.dat could appears on "C2" about 30 seconds after it creation on "C1".
Which are NFS parameters that are involved in this process?
I have tried to set ACTIMEO to 0 and it'is less bad, but the "response" time is not good. And other flags... but it is not ok.
I have also put NFS in TCP mode, and other ....
I have tried also the SYNC flag, it is no better

Thank you for few ideas.
PS
[sorry for my poor English...]

SolarMax

View Public Profile for SolarMax

Find all posts by SolarMax

9 More Discussions You Might Find Interesting

1. Solaris

Solaris 8 server and Jumpstarting 2.6 clients

Ladies and Gentlemen: I have successfully configured a Solaris 8 server with Jumpstart! I can Jumpstart Solaris 8 client systems with no problem. My configuration is as follows: Jumpstart Server: Solaris 8 patched with Recommended Patches from June 05. I have installed Solaris 8 in...

2. Cybersecurity

List of HTTP/FTP-clients on a server

The other day, a friend of mine had his Linux webserver compromised because he was running a vulnerable PHP-script. The "hacker" had used a malformed URL to include a wget-command to fetch some stuff off the net and install it in /dev/shm where it ran undetected. Fortunately, the webserver ran as a...

3. AIX

NTP server with aix & wintel clients

Good morning to all, can someone advise me how to setup aix ntp server with aix & wintel clients? Secondly, I also require to enable the service to autostart on reboot, how do I configure this? Thirdly, how do I configure daily autosync between clients and server? Please advice, thanks....

4. Solaris

Solaris 9 as a nfs client -- centos as a nfs server.

Hello, I have a centos as nfs server, its name is centos_A. After I finish the setup of the nfs server, the other linux can access this nfs server immediately via /net/centos_A/* But, My solaris 9 can not access /net/centos_A/* immediately. I have to leave /net/centos_A, and wait for about...

5. IP Networking

Some clients cannot ping UNIX server

All of sudden in this morning, some computers could not connect to our UNIX server while other still could. Some computers could ping the server while some could not. Same on the server side. It could ping some clients but not some. All Windows clients could ping each other. And more, the...

6. Programming

Clients - Server ( UDP )

Hello, I have a question: I want to create a n client to one server connection. This is the client-server algorithm. Enybody help to make the changes?

7. UNIX for Dummies Questions & Answers

Unmounting NFS idle clients from server

Hello World, We have a software repository server in our environment which we use as an NFS server. Now this has been going on well before I was hired. Now, I observed many users not unmounting the NFS resources after their use. I ran showmount and it showed 513 current sessions. :wall: Is...

8. Solaris

NFS with a NAS: permanently inconsistent directory state across clients

Hi, I am having some NFS directory consistency problems with the below setup on a local (192.) network: 1. Different permissions (chmod) for the same NFS dir are reflected on different clients. 2. (more serious) an NFS dir created on client1 cannot be accessed on client2; this applies to some...

9. AIX

AIX NFS Server and NFS Client

Hi 2 ALL, try to run NFS Server in AIX 7.1 : 1. Step by step on NFS Server node mkdir /tmp/test chgrp staff /tmp/test chmod 775 /tmp/test-- create export directory (fs) mknfsexp -d /tmp/test -t ro exportfs -va show mount -e :/# exportfs -av exports: 1831-187 re-exported /tmp/test...

LEARN ABOUT OPENSOLARIS

nfs_selinux

nfs_selinux(8)						 NFS SELinux Policy documentation					    nfs_selinux(8)

NAME

       nfs_selinux - Security Enhanced Linux Policy for NFS

DESCRIPTION

       Security Enhanced Linux secures the NFS server via flexible mandatory access control.

BOOLEANS

       SELinux	policy	is customizable based on the least level of access required. SELinux can be configured to not allow NFS to share files. If
       you want to share NFS partitions, and only allow read-only access to those NFS partitions, turn the nfs_export_all_ro boolean on:

       setsebool -P nfs_export_all_ro 1

       If you want to share files read/write you must set the nfs_export_all_rw boolean.

       setsebool -P nfs_export_all_rw 1

       These booleans are not required when files to be shared are labeled with the public_content_t or public_content_rw_t types. NFS	can  share
       files labeled with the public_content_t or public_content_rw_t types even if the nfs_export_all_ro and nfs_export_all_rw booleans are off.

       If you want to use a remote NFS server for the home directories on this machine, you must set the use_nfs_home_dirs boolean:

       setsebool -P use_nfs_home_dirs 1

       system-config-selinux is a GUI tool available to customize SELinux policy settings.

AUTHOR

       This manual page was written by Dan Walsh <dwalsh@redhat.com>.

SEE ALSO

       selinux(8), chcon(1), setsebool(8)

dwalsh@redhat.com						    9 Feb 2009							    nfs_selinux(8)