Skip to main content

NFS sync async

NFS Server and Client signification of "sync" and "async"

First, thanks to

What I write here is basically the same (a copy /paste), but adapted to my personnal needs

sync and async have different meanings for the two different situations.

On the client context

sync in the client context makes all writes to the file be committed to the server. async causes all writes to the file to not be transmitted to the server immediately, usually only when the file is closed. So another host opening the same file is not going to see the changes made by the first host.

Note that NFS offers "close to open" consistency meaning other clients cannot anyway assume that data in a file open by others is consistent (or frankly, that it is consistent at all if you do not use nfslock to add some form of synchronization between clients).

On the server context

sync in the server context (the default) causes the server to only reply to say the data was written when the storage backend actually informs it the data was written. async in the server context gets the server to merely respond as if the file was written on the server irrespective of if it actually has written it. This is a lot faster but also very dangerous as data may have a problem being committed!


In most cases, async on the client side and sync on the server side. This offers a pretty consistent behaviour with regards to how NFS is supposed to work.

Popular posts from this blog

npm run build base-href

Using NPM to specify base-href When building an Angular application, people usually use "ng" and pass arguments to that invocation. Typically, when wanting to hard code "base-href" in "index.html", one will issue: ng build --base-href='' I used to build my angular apps through Bamboo or Jenkins and they have a "npm" plugin. I got the habit to build the application with "npm run build" before deploying it. But the development team once asked me to set the "--base-href=''" parameter. npm run build --base-href=' did not set the base href in indext.html After looking for a while, I found where it says: You need to use −− to pass arguments to npm scripts. This did the job! The command to issue is then: npm run build -- --base-href='

Jenkins invalid privatekey

Publish over SSH, Message "invalid privatekey:" With quite recent (June-July 2020) installations of Jenkins and OpenSSH, I have the following error message when using the "Deploy overs SSH" Jenkins plug-in and publishing artifacts to the target overs SSH: jenkins.plugins.publish_over.BapPublisherException: Failed to add SSH key. Message [invalid privatekey: [B@d8d395a] This problem seems to be referenced here: Just regenerate a key with the right parameters To solve it: ssh-keygen -t rsa -b 4096 Or ssh-keygen -t rsa -b 4096 -m PEM

Emacs TypeScript Development

Emacs Configuration for Typescript In order to comfortably develop on Node, React or Angular projects with Emacs, TIDE is a good solution. We have TypeScript code highlight (that is the minimum!) and code completion based on the codebase (not only on locally defined and builtins) In order to achieve that: Install Emacs (24+) Install Node Install Typescript (which will provide "tsserver") Install TIDE and some usefull dependencies Configure Emacs to use all those Node is then installed in " /home/mihamina/Apps/node-v12.18.0-linux-x64/bin ": you should add it to your PATH. Installing Typescript is done with: npm install --save typescript @types/browserify After that, "tsserver" will be in " /home/mihamina/node_modules/.bin " Then comes the installation of TIDE: With the Emacs package manager, M-x package-install , install "tide". Do the same for "web-mode", "flycheck", "company" "js2-mode" and "