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5

What you want do do can be achieved precisely with overlayfs. With it you can take your /full dir and another /notfull dir and mount them at /third-dir. Reads will seek through the /notfull into the /full and writes will go to a third dir. Have a look at the docs, remount the full dir away from the target name and then use overlayfs to recreate the ...


4

From a clients point of view, if the failower is implemented good enough, it will only seem as if the NFS server were gone for a very short time and then came back. However, to avoid loosing data you might want to mount with the "sync" option. One way to look if a process is waiting for io is to do "ps aux" and look for "D" in the "STAT" column. Some common ...


3

What you're likely looking for is called a Distributed File System. These require special handling and are not part of normal distro installations. There is a Wikipedia article containing a non-exhaustive list of distributed file system platforms. The main selling point of distributed file systems is redundancy, scalability, and access transparency. Like ...


3

It is possible, though not trivial, to setup NFS Clusters in Amazon EC2 using DRBD for synchronous replication and Pacemaker + Corosync for automating failover of the NFS service and exports between nodes (without interrupting client access). If you're planning on replicating synchronously ("real-time"), you'll need both your EC2 instances to be in the ...


2

Take a look at nfstrace https://github.com/epam/nfstrace. It captures network traffic and perform deep packet inspection. It finds NFSv3/v4 procedures (READ, WRITE etc.) and tracks its statistics. Also, you can develop new pluggable modules for nfstrace.


2

Try to use this Git setting, which makes a huge performance difference on NFS shares: git config core.preloadindex true


2

You won't be able to expand the space by mounting them both on /folder if that's what you want. If you want to create another directory like /folder/newshare like you said, you should be able to mount another NFS share there to make it seem like there's more space under /folder. I just confirmed that I could create a mount point for a NFS share inside ...


1

You don't state what engine are you using, but let me presume it's InnoDB (as it's pretty much standard these days) then in MySQL Docs (Using actual symbolic links has never been supported for InnoDB tables.) and The DATA DIRECTORY clause is a supported alternative to using symbolic links, which has always been problematic and was never supported ...


1

First I would use sshfs. Second up to NFSv3 on Linux NFS is insecure. You can either build a private NFS network or use secure NFSv4.


1

In general, if you experience problems with idmapping you need: check that client can talk to LDAP/NIS server clean idmap cache by running 'nfsidmap -c' start rpc.idmapd in in a debug mode (rpc.idmapd -f -v) and watch the requests.


1

When I do similar things in AWS or similar clouds, I use autofs to mount the log directories. That means that the log directories are mounted on a demand-driven basis, ie not until needed and unmounted shortly thereafter. It also means that access to a directory that maps to a down server involves a short wait before an empty directory is returned, instead ...


1

Looks like a job for NFS. You can make server01 an NFS server that exports the /total_app directory. Then you can allow all servers to mount it. You must only be sure that server01 is always up, running, and accessible. Also be careful that the servers are not 'destroying' each other configurations for the applications in the directory.



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