NFS performance is the measurement of network file system performance

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10
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1answer
3k views

NFS v3 versus v4

I am wondering why NFS v4 would be so much faster than NFS v3 and if there are any parameters on v3 that could be tweaked. I mount a file system sudo mount -o ...
8
votes
1answer
3k views

How does NFS read cache work on Debian?

I am planning to use NFS to serve out many small files. They will be read very often so client side caching is crucial. Does NFS handle this? Is there a way to increase the client side caching in some ...
5
votes
3answers
2k views

Serving static files with nginx over NFS?

I have a website that is getting about 7k requests per seconds on a nginx server. This server both handles rewrites to an Apache server as well as serving static files, images, etc. directly. Static ...
4
votes
1answer
5k views

Server load high, CPU idle. NFS the cause?

I am running into a scenario where I'm seeing a high server load (sometimes upwards of 20 or 30) and a very low CPU usage (98% idle). I'm wondering if these wait states are coming as part of an NFS ...
4
votes
1answer
759 views

Relationship between MTU and NFS rsize/wsize options

I'm trying to understand networking settings related to NFS and various buffer sizes (and there are quite a few). I'm running wireshark and inspecting the TCP packets arriving at the NFS server. ...
4
votes
1answer
223 views

NFS soft mount timeout too slow

We have a VERY busy cluster of servers. Our 16 app servers serve our application off of a local SSD on each machine, but they also process images which are then served off of our cdn. Because of this, ...
3
votes
2answers
147 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
1answer
333 views

Using NFS for scalable PHP/MySQL web application

Here's the situation: I have a PHP/MySQL web application that accepts user uploads (pdf files). From these pdf files' pages a preview image is made on the fly and presented to the web app's users. ...
2
votes
2answers
718 views

Removing and copying files slow on NFS folder

I have a server that hosts images and allows access to one directory for one client over NFS. The directory contains about 70K images and is 12GB big. When I execute commands like cp or rm on the ...
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 ...
2
votes
1answer
145 views

Tool to saturate NFS traffic

Does anyone know of a tool I can use to saturate NFS traffic? The reason is I'm seeing some Cisco switch Output errors that I believe is caused by high NFS traffic and trying to replicate the ...
2
votes
0answers
40 views

What is the typical access time for reading a 100KB file over a LAN from an NFSv4

Would it be right to compute it as the network time (2ms) + disk seek and block read (10ms) ~= 12ms? Would that be the correct order of magnitude? interested in the response time, not absolute ...
1
vote
1answer
447 views

NFS performance trouble: with infiniband gets stacked with many users?

I have a RAID system on A server and similar configuration on B server-both with Scientific Linux 5.5. They are connected with infiniband and RAIDS from A are mounted with NFS to ServerB. Now when the ...
1
vote
0answers
77 views

Very strange NFS speed

I've been looking into this behaviour for quite a bit, I'm not sure if it's normal but strange or an issue, I'm hoping someone can provide some info: I have a small linux server, but am using windows ...
1
vote
0answers
66 views

PHP file load time, perhaps related to NFS?

The Problem I'm attempting to diagnose a performance issue on a Drupal website I'm developing. In the morning, when the site has seen no traffic (not even a cron run) for over 8 hours, the homepage ...
1
vote
1answer
67 views

Balancing bandwidth allocation for nfsd

I am using NFS shares to transfer image files using clonezilla onto multiple lab machines, I am currently only imaging one or two machines at a time as a testing protocol but whenever I run more than ...
1
vote
1answer
290 views

rpcbind causing very high load on Fedora 10 system with nfs

I've got a Fedora 10 system that's exporting some file systems via NFS. One of the exported file systems is used very heavily on a client system when I run a search engine indexer. The file activity ...
0
votes
1answer
50 views

Running computations on a remote server using 2 possible methods. Which is ideal? [closed]

So, this is more of a general question than a specific problem. I'm using AWS and I have my main web server on an m1.medium instance but there are some computationally intensive tasks that I want to ...
0
votes
1answer
68 views

NFS performace degradation [closed]

I work for a small software house. We share our developers' home directories over NFS. The primary use for this is to host the users' git repository. Since last week, there has been a signficant ...
0
votes
1answer
86 views

new centos os servers, nfs mounting is really slow

So i am setting up two new boxes (actually linodes) nfs.server - CentOS release 6.2 in my /etc/export i have /home/unit 192.168.131.103(sync,insecure,no_subtree_check,no_root_squash,rw) ...
0
votes
1answer
81 views

Why are nearly all my NFS calls for syscltid and syscltidconf?

I manage an installation with 1 server running Ubuntu 12.04 and 60 Raspberry Pi microcontrollers running raspbian. Each Pi mounts an NFS drive from the server to read new code and store logs. We ...