Network File System (NFS) is a network file system protocol originally developed by Sun Micro systems in 1984, allowing a user on a client computer to access files over a network in a manner similar to how local storage is accessed. NFS, like many other protocols, builds on the Open Network ...

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Slow NFS and GFS2 performance

Recently I've designed and configured a 4 node cluster for a webapp that does lots of file handling. The cluster have been broken down into 2 main roles, webserver and storage. Each role is replicated ...
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3answers
6k views

umount bind of stale NFS

i've got a problem removing mounts created with mount -o bind from a locally mounted NFS folder. Assume the following mount structure: NFS mounted directory: $ mount -o ...
4
votes
1answer
2k views

Mount Mac OS X 10.7 share on CentOS?

I need to create a mount point/share on a Mac OS X 10.7.4 (non-server) machine that a CentOS 5.2 box can mount. I've searched a ton but most instances are for using a linux server and Mac client... ...
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4answers
20k views

How to measure IOwait per device?

I have a server, which exports home directories over NFS. They are on software RAID1 (/dev/sdb and /dev/sdc) and the OS is on /dev/sda. I noticed that my %iowait as reported by top and sar are ...
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2answers
2k views

NFS Caching Issue

We are having an issue that happens intermittently during a code deployment. NFS caches the files as they are read, but if a file is read during a code deploy it stays in a dirty state as if the file ...
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1answer
1k views

Does an NFS export with sec=krb5 *require* that the parent directory also be exported with sec=krb5?

I copied somebody's NFS server/client setup verbatim and am having trouble making sense of what's going on with it. This is the /etc/exports: /export ...
4
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1answer
917 views

mount using insecure ports for nfs

Title says it. mount is occasionally making NFS mount/unmount requests from insecure ports. I believe the issue is being caused by all of the secure ports being stuck in TIME_WAIT after periods of ...
4
votes
1answer
6k views

NFS. Non-root mount requests

I'm trying to make my NFS server allow non-root mount requests. Server: Debian Squeeze, kernel 2.6.32-5-686 What I have now: root (or sudoes) can mount NFS file systems, but regular users can't. ...
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votes
2answers
434 views

Linux shared writable directory recursively

How can I make a directory recursively read/writable to a group of users? PROBLEM: This is a directory used by apache so access rights should be fairly strict. The only way I could make it ...
4
votes
1answer
2k views

High Availability NFS Server (Heartbeat/DRBD) long hang on clients when takeover occurs

We have a High Availability NFS environment using DRBD, heartbeat and nfs exposed to clients (Simular to the following https://help.ubuntu.com/community/HighlyAvailableNFS ). This seems to be a ...
4
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1answer
2k views

NFS Datastore Appears Empty!

I've got an NFS server problem. The datastore connected and seems to be a valid datastore in both the vSphere client and under /vmfs/volumes. The issue is that it appears to be empty! I can create ...
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votes
1answer
423 views

Single Sign On and NFS permissions on Windows

Like many, I've been trying to move away from Microsoft Active Directory + CIFS file sharing into a custom LDAP solution + NFSv4. All the workstations here run Windows 7, and I have set up the ...
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1answer
2k views

Why does the “nocto” NFS mount option in Linux not prevent flush-on-close?

I've been learning about the close-to-open policy of NFS, which causes each file to be flushed to the server as it's closed, to ensure consistency across clients. (See ...
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votes
1answer
1k views

Intermittent NFS lockups on Isilon cluster

We have an Isilon cluster with 8 IQ 12000x nodes which exports storage via several NFS shares for a handful of Linux and Solaris clients. There is a Linux system that has one of these NFS filesystems ...
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0answers
409 views

Nobody nogroup on ubuntu client with Solaris server

I have an openIdiana server with ZFS and it has been shared with NFS on a ubuntu server (called server1) one year ago. Now i am asked to shared it on a second ubuntu server (called server2). So i have ...
4
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1answer
1k views

NFS mount mounted inside another NFS mount disappears randomly

I have quite an odd issue where my nested NFS mounts just disappear randomly from time to time. The fstab entries look somewhat like this: nfs:/home /home nfs ...
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0answers
398 views

using chained automount to mount home directory

I have set up two directories mounted with automount (via LDAP): in the /home directory automount is configured to mount * -fstype=bind :/network/srv/home/& in the /network directory one ...
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0answers
1k views

how to tune NFS client on MacOS to get Linux like performance?

I have a NFS server running Linux and exporting a couple of shares. Both Linux and MacOS clients connect to the server, and while with the Linux clients I get ~ 75MB/s write speed, the MacOS clients ...
4
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1answer
2k views

Weird nfs performance: 1 thread better than 8, 8 better than 2!

I'm trying to determine the cause of poor nfs performance between two Xen Virtual Machines (client & server) running on the same host. Specifically, the speed at which I can sequentially read a ...
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5answers
3k views

Would using SAS disks instead of SATA disks make sense over NFS for a VMWare datastore?

We are deciding whether to use SATA or SAS aggregates on our Filer for our VMWare datastore. We will be using NFS to connect the VMWare hosts to storage. Doesn't seem to make sense to use SAS disks ...
3
votes
4answers
2k views

taring vmdk files does not preserve thinness

we have NFS storage, where we store our backups.. we manipulate with them from linux machine where the nfs is also mounted.. So, for example thin provisioned thin.vmdk disk is on linux seen as ...
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4answers
3k views

Advantages and disadvantages to using NFS with Apache

I am coming into an environment where they are using NFS to access PHP scripts and static web content that is stored on a server that is on the same network as the front end Apache server. Only one ...
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1answer
9k views

What are the pros and cons of OCFS2 and GFS2 filesystems versus NFS?

We need to set up a SAN accessible from a bunch of computers, both virtualized and real. We have an iSCSI SAN and I need to ponder some of the options. What are the differences between GFS2 and ...
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3answers
1k views

Transfer between two NFS shares on the same machine

I have one machine that exports two directories, each on one physical hard drive. When files are moved between these two shares, does the data transit on the network entirely? If so, is there a way ...
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3answers
3k views

NFS mount “hanging” when accessing from a server on a different subnet

Here's a problem which I am at a loss to diagnose: Our user home directories are served via NFS from an Apple XServe running Mac OS X 10.5.7. Normally they are exported to our default office subnet, ...
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3answers
12k views

NFSv4 with idmap

The following errors appear on the NFS server, could you please advise how I can fix this? Details: System: CentOS release 6.4, NFS: nfs-utils-1.2.3-36 # cat /etc/idmapd.conf [General] Domain = ...
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votes
1answer
579 views

Single NFS-server to redunant NFS-storage

Currently, we have 6 physical host machines installed with Proxmox VE. These hosts are running a number of virtual machines. Mostly Windows Server 2008 R2. The hosts are Intel Blade servers with a ...
3
votes
1answer
373 views

How to Secure NFS on untrusted clients environment

If I understand how it works, NFS security relies in the fact that the clients can be trusted. I'm worried about some users accessing files from others. Yes, root_squash option avoid root user on ...
3
votes
1answer
3k views

Shared folder mounted on OSX: NFS, WebDAV or AFP?

We are trying to figure out how to best mount a network share on OSX machines (only). We went with WebDAV initially which does what expected but it's extremely sluggish. Also the Finder seesm to have ...
3
votes
1answer
6k views

When a samba server shares NFS4 mount directory, window clients cannot copy file. ERROR: 0x80070021

The error reported by windows client is like this ERROR: 0x80070021 The process cannot access the file because another process has locked a portion of the file. I google it and hit samba bug report ...
3
votes
3answers
869 views

Why doesn't NFS recognize a new UID?

I have two servers running RHEL6. I have root access to both. The main server, which I will refer to as server, is a database server. The application server, which I will refer to as client, mounts a ...
3
votes
1answer
15k views

NFS client mount fails behind firewall

I have an Ubuntu 11.10 system with an iptables firewall. After pinning the ports for mountd, lockd and statd, then opening them up in iptables, I am able to expose NFS shares through the firewall ...
3
votes
2answers
151 views

Measuring I/O Performance Paradox

I'm trying to figure out the correct way to get the 'real world' write performance of my NFS cluster. The NFS export is mount on a XEN hypervisor, and I'm running 'dd' from within a VM. What I ...
3
votes
2answers
2k views

iozone benchmark results interpretation

I'm using iozone version 3.373 to benchmark NFSv4 and NBD, but the results are a bit weird! It says that outputs are in KBytes/sec but I am getting values such as 3,411,938 for random read. I am using ...
3
votes
3answers
2k views

Permission denied for symlink to executable in nfs mounted directory with the sticky bit enabled

We have an NFS export for any of our users to install and maintain useful software for the network mounted at /public on our clients. On the NFS server, this directory is world writable with the ...
3
votes
1answer
5k views

ZFS nfsshare to export RW and RO host?

I have been exporting NFS from OpenSloarins like this (successfully): zfs set sharenfs=root=rw=host1:host2:host3 pool1 I'm acting according the man pages sharefs, share_nfs but the following does ...
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votes
3answers
2k views

Is mdadm Raid-1 Over A Network File Share Possible?

I am using 64bit CentOS 5.5 I know it's possible to set up software RAID1 using mdadm using a physical hard disk and a RAM disk. Is it possible to set up software RAID1 with mdadm using a NFS mount ...
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3answers
3k views

Concurrent NFS access

Similar to Concurrent FTP access. How is concurrent file access handled for NFS? Say that one client is updating/overwriting a file on a NFS server, and a process on the server is reading that same ...
3
votes
1answer
67 views

Possible to set the specific order of a resource in a Pacemaker group?

Given the Pacemaker/Corosync resource configuration described below, is it possible to add a resource in a specific position within the resource group? The configuration is CentOS 7.2 using the ...
3
votes
1answer
135 views

Creating a NFS share across servers with varying UIDs

I have 4-5 Ubuntu 14.04 servers in my network and I want to share a common /home directory between them. I have setup the nfs server, and I can mount the directory on various clients. However my ...
3
votes
2answers
93 views

Is there a valid stability argument against NFS?

We are adding a feature to our web app where uploaded files (to app servers) are processed by background workers (other machines). The nature of the application means these files stick around for a ...
3
votes
1answer
359 views

What makes Lustre faster and more scalable than NFS?

I have read in various places (e.g. here and here) that NFS' I/O performance does not scale, while Lustre's does, and that Lustre can deliver better I/O rates in general. There seem to be various ...
3
votes
1answer
545 views

Making NFS behave like a block device

We're currently working on a virtualization setup, and because of features like being able to grow volumes on our filers rather than having to go through the process resizing block devices etc. we'd ...
3
votes
1answer
473 views

how can I mount an nfs share on a mac laptop so when it is away from my network it doesn't hang

I can mount an nfs share on my linux machine just fine, but this is a macbook pro that is doing the mounting, and when the laptop goes away from my home network nfs hangs trying to communicate with ...
3
votes
1answer
6k views

automount - autofs mount issue on CentOS 6.5

Server CentOS 6.5 and Selinux is permissive My NFS server share in /etc/exports /home/unixmen/ 10.0.0.0/24 (rw,sync,no_root_squash) Client running on another CentOS 6.5 host , is able to mount ...
3
votes
2answers
434 views

NFS client keytab: multiple machines

How should one go about setting up client-side keytab files for each client machine to access network services? My working example is NFSv4, which requires each client to have a Kerberos keytab ...
3
votes
3answers
2k views

multiple mounts of same NFS share on one client?

I'm moving webspace content to NFSv3 shares. Because of suexec restrictions I have different paths to different subsets of the content on the client. I wonder if I can still have all of the content in ...
3
votes
1answer
464 views

build user chroot on first login

I'm using ldap for remote user authentication and I basically need to either figure out how to: a. chroot a user on machine b from machine a via nfs,(which doesn't seem possible without mounting ...
3
votes
6answers
15k views

vSphere ESX 5.5 hosts cannot connect to NFS Server

Summary: My problem is I cannot use the QNAP NFS Server as an NFS datastore from my ESX hosts despite the hosts being able to ping it. I'm utilising a vDS with LACP uplinks for all my network traffic ...
3
votes
1answer
905 views

ZFS, NFS and user based quotas

I am using a ZFS storage (FreeNAS 9.1) with NFSv3. The NFS is mounted on Debian machine, where the linux users are created (they don`t exists on FreeNAS). How do I enable standard linux user based ...