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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259 views

Apache over NFS needs remount after certain file changes

I have 2 web servers that share files over NFS. When we update our php code to a new version, our update script moves the existing directory and copies in the new version in its place. We make the ...
0
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1answer
470 views

Writing with dd in an NFS mount point

I am trying the following: sudo dd if=/dev/sda1 of=/mnt/nfs/l bs=1M It fails: dd: opening `/mnt/nfs/l': Permission denied However, normal file creation and writing with "cat" works. What could ...
0
votes
1answer
867 views

NFSv4 is not added to rpc

I'm using Debian testing and although I've added NEED_IDMAPD="yes" to /etc/default/nfs-common. My exports file is: /nfs4exports ...
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2answers
316 views

DRDB and NFS: NFS downtime during failover restoration

I'm pretty new to DRBD and NFS, and am in the process of testing a DRDB server with heartbeat to use for our company's NFS share. The entire setup is running fine, with the NFS state directory ...
0
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2answers
358 views

writing to opensolaris ramdisk over NFS

I want to read and write to a ramdisk on OpenSolaris for performance testing purposes. The tests would be aimed at network transmission and I want to rule out disk performance. I set up the ramdisk on ...
0
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2answers
285 views

I have to restart nfs service every time after I boot Ubuntu Server 11.04

After a reboot of my Ubuntu server, the nfs shares and not accessible. I have to do sudo /etc/init.d/nfs-kernel-server restart and then clients can mount the nfs shares just fine. The service is ...
38
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7answers
9k views

Troubleshooting latency spikes on ESXi NFS datastores

I'm experiencing fsync latencies of around five seconds on NFS datastores in ESXi, triggered by certain VMs. I suspect this might be caused by VMs using NCQ/TCQ, as this does not happen with virtual ...
0
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2answers
195 views

Consolidating storage on multiple VPS instances

Say you have four VPS instances running. One is an nginx proxy which handles requests for your two middle layers VPS instances running a web app via FastCGI and the final VPS is running the database. ...
2
votes
3answers
911 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 ...
0
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1answer
219 views

Mounting NFS directory causes creating Zero byte files

I have two Servers, Server X (IP 192.168.1.1) and Server Y (IP 192.168.1.2), both of them are ubuntu 9.1 i have created varnish load balancer on them for my drupal website (pressflow 6.22) I have ...
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4answers
2k views

DRDB and NFS: is there any efficient way to make failover transparent for NFS

We are implementing DRDB + heartbeat with two servers to have a file system with failover. These servers exposes a NFS service for other servers Currently DRDB is working just fine, but when testing ...
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1answer
182 views

Issues mounting NFS share on client

I'm kind of new to working with NFS shares, but here's what I have. Server: /etc/hosts.allow: ALL: client1.mydomain.com, client2.mydomain.com /etc/hosts.deny: portmap:ALL lockd:ALL mountd:All ...
2
votes
1answer
2k views

NFS performance troubleshooting

I am troubleshooting NFS performance issues on Linux, and I'm looking at the following nfsiostat output: host:/path mounted on /path: op/s rpc bklog 96.75 0.01 read: ops/s ...
3
votes
1answer
2k views

Mount to NFS export of autofs mount shows empty contents

I use autofs to mount some iso files in folder /mnt/iso: Fedora-13-x86_64-DVD.iso Fedora-14-x86_64-DVD.iso Fedora-15-x86_64-DVD.iso The autofs is working fine and I can see the contents of iso ...
6
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2answers
1k views

Getting ZFS per dataset IO statistics (or NFS per export IO statistics)

Where do I find statistics about how IO is divided between zfs datasets? (zpool iostat only tells me how much IO a pool is experiencing.) All the relevant datasets are used through NFS, so I'd be ...
1
vote
1answer
424 views

NFS - Detecting remotely created files programmatically?

I'm trying to monitor an NFS share and detect the creation of a file by a process running on a remote system. The problem is that the detection isn't working after the file has been created, my script ...
1
vote
3answers
472 views

Can I access a ZFS Volume as if it were a file?

Ok... sounds like a strange question, but bear with me. Can I access a ZFS volume as if it were a file? Specifically, can I share a ZFS volume as a file over NFS? Here's what I'm doing: I have ZFS ...
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2answers
132 views

Exporting Linux shares to Linux clients with no per-share group authentication and no permission issues

Given one Linux server, and many Linux clients, I need to export some shared directories from the server. The behavior I want to obtain is really simple: a group of users can use a shared space on the ...
8
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3answers
2k views

Fault-tolerant NFS?

Probably a FAQ but I haven't found anything useful after a while of searching: Can I set up NFS in such a way that every single error (e.g. server CPU, hard disk, hd controller, network adapter, ...
6
votes
2answers
731 views

The best way to share a file uploads directory across horizontally scaling web servers

I'm currently trying to spec up a horizontally scalable cluster for a drupal based web app, that looks something like the colorful diagram below: The load balancer implements sticky sessions, so a ...
2
votes
1answer
413 views

What NFS hosting services exist?

My situation: I manage a small business, and would like to migrate the files on our local file server to a 'cloud' service. There are a large number of 'file storage' and 'file hosting' services (S3, ...
3
votes
1answer
876 views

Poor OpenVPN NFS performance

I have EC2 application servers behind an elastic load balancer. All of the application servers have access to a shared storage server, notably for centralized cache files, logging, etc. The shared ...
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1answer
1k views

what is the latency for an 8K transfer of Fibre Channel? (NFS vs FC) [closed]

I've heard it said that a 512byte data transfer over fibre channel is 10us so would an 8k (16x the data) take 160us? or is much of that 10us one time transmit overhead? I'm interested in comparing ...
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vote
1answer
1k views

setting up a high speed load balancing server cluster - web/db/NFS

I'm looking for advice on the best way (mainly in terms of hardware) to set up a high speed load balancing server cluster on a budget (say £2,000 - £ 3,000) to host web services behind a single ip ...
0
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1answer
353 views

NFS stalls on client side when server goes down

I'm running a few Amazon EC2 instances. One of them is a NFS server with the following exports: /home/user/comm 10.0.0.0/255.0.0.0(ro) 50.0.0.0/255.0.0.0(ro) And in the client side: ...
0
votes
1answer
75 views

PVFS with a NAS in RAID : good match?

I have to test PVFS i/O performance on a big file. First I am trying on a small csv file contains 1 000 000 rows. My computing is simple : it consists to get the number of differents pattern in the ...
3
votes
3answers
569 views

Access files located on the underlying filesystem of an NFS mountpoint

Perhaps this is an odd request, but it's the opposite of the question detailed at: Is it possible to view the contents of an underlying NFS mount without unmounting the NFS content? I have an ...
3
votes
5answers
12k views

NFS protocol vs iSCSI protocol

I was reading some articles on VMware ESXi about storage. One thing mentioned was the advantages of being able to use vMotion, DRS and etc. to achieve High Availability. The one thing that I kept ...
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vote
3answers
2k views

sysctl.conf not running on boot

At what point is sysctl.conf supposed to be read during boot, and why might it not be running? I have the following settings which are not being applied when I reboot: ...
0
votes
1answer
1k views

Very very slow NFS performance

I'm having a quite strange issue. I'm mounting a NFS share from a SAN (ubuntu) to another machine (centos) Mounting the share works just fine; but when I try some tests like : dd if=/dev/zero ...
24
votes
7answers
15k views

Why rsync is faster than NFS?

Few days ago I noticed something rather odd (at least for me). I ran rsync copying the same data and deleting it afterwards to NFS mount, called /nfs_mount/TEST. This /nfs_mount/TEST is ...
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vote
3answers
238 views

How can I access to a folder as it was one on my own server but on a remote?

I need to provide to an application data in folder but this folder is on remote server. I know I can use NFS or SAMBA but I'm not a sysadmin, and I just know how to set up such mount point, as a ...
0
votes
2answers
426 views

wrong “permission denied” in linux?

root@SERVER:~# cat /etc/passwd | grep www-data www-data:x:33:33:www-data:/var/www:/bin/sh root@SERVER:~# ls -al /cluster/www/html/tmp/reportexport_274.xml -rwxrwxrwx 1 www-data www-data 908 ...
3
votes
1answer
296 views

Can open files be unlinked on NFS mounted volumes while applications that still have them open read/write?

Does NFS allow me to unlink/delete open files like I can do with local file systems? The reason I ask is that I'm developing something that runs on multiple servers and may access NFS as a back end. ...
0
votes
3answers
2k views

NFS Client reports Permission Denied, Server reports Permission Granted

I have two RedHat 4 Servers. The client is 4.6, the server is 4.5. I'm attempting to mount a share from the server, onto the client via NFS. The /etc/exports configuration is as follows: ...
0
votes
1answer
130 views

Installing Oracle 10g on Panasas PAS12 (NAS)

We are using Panasas PAS12 (running in pNFS protocol) internally in our team, and are currently thinking of migrating our Oracle 10g in it. We have two sides among ourselves. On one hand, Oracle 10g ...
2
votes
2answers
231 views

In Linux, how to temporarly freeze a user?

On a mis-configured or buggy network filer (NFS NAS) writing a large file can cause the filer to freeze. For diagnostics I need to be able to: Suspend (or in other words temporary freeze) all ...
6
votes
2answers
886 views

How to set i/o priority for nfs client processes?

The configuration is: A linux server and a nas box (netgear) acting as nfs server. It is easy for a single process on the linux server to use all i/o bandwidth by simply copying a file from the nfs ...
0
votes
1answer
349 views

Ubuntu Lucid 10.04 preseed won't mount NFS volume during install

I have a preseed installation, which runs a script on its late_command. The preseed itself works fine, the script - too. I want to mount NFS volume with this script and get the packages from there. ...
1
vote
2answers
913 views

What does NFS do when /etc/exports contains an export that's within the directory of another export?

I have an /etc/exports file like this: /home remotehost.com(rw,root_squash,anonuid=500,anongid=500) /home/fred remotehost.com(rw,root_squash,anonuid=1000,anongid=1000) Do the two ...
1
vote
1answer
890 views

NFS share suddenly becomes unresponsive

We've got a setup involving separate web & email servers mounting various shares on the same pysical NFSv3 server. The web server uses a share for apache vhost files, the mailserver uses a share ...
1
vote
1answer
834 views

Export NFS to multiple networks in FreeBSD (FreeNAS)

I'm trying to export a share to multiple networks using the following in the /etc/exports file: /mnt/tank/xen_nfs -alldirs -mapall=root:wheel -network 10.1.1.20 10.1.1.45 10.1.1.105 but whenever I ...
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votes
2answers
821 views

Is there a flag I can pass to either `df` or `mount` to make them display results for only locally-mounted filesystems?

I'm getting mighty tired of having to manually egrep out NFS- and SMB-mounted filesystems whenever I am checking on the condition of locally-mounted filesystems. So, my question is thus: is there some ...
3
votes
1answer
383 views

Mixing NFSv4 all_squash and sshfs access

I have a problem with my server. In my internal network I hand out several network shares using NFSv4 from a Debian Squeeze server to my clients. These shares use the all_squash option because I want ...
0
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3answers
1k views

Disk throughput dramatically reduced when using ZFS on OpenSolaris?

I'm building a simple ZFS file server for the small business I work for. The server is a Dell Poweredge 840, with 1GB RAM. The OS (OpenSolaris 2009.06) is installed on one SATA drive, and there are ...
5
votes
1answer
2k views

Error “fileid changed” when accessing files over NFS

I have an nfs-kernel-server configured and running on Ubuntu 10.04 Server. /export THIRD_SERVER_IP(rw,fsid=0,insecure,no_subtree_check,async) ...
1
vote
1answer
316 views

Tuning based on DataOntap NetDiag

I have a IBM N-series 3700 (NetApp Filer) running data ontap 7.4. When I run netdiag I get: The TCP receive window advertised by NFS client x.x.x.x is 5888. This is less than the recommended value of ...
0
votes
1answer
73 views

Forward cache for large storage provider

I have a web server with an NFS mount to a large storage provider, and it serves content via HTTP. I would like to have a 1-2 GB dynamic forward cache so that if my NFS mount goes down, I can still ...
2
votes
1answer
415 views

NFS share: no space left on device

My setup consists of a server, running Ubuntu 10.10, and a device, running a customized Linux. The device gets its kernel and mounts its root filesystem from the server using TFTP and NFS, ...
2
votes
2answers
678 views

ESX or ESXi as FCoE or ISCSI or NFS target?

Is is possible to set up ESXi or more expensive ESX server as a storage target (FCoE, ISCSI or NFS, in that order) for other ESX servers? If so, how?