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  • Difference between sync and async mount options
    async is the opposite of sync, which is rarely used async is the default, you don't need to specify that explicitly in releases of nfs-utils up to and including 1 0 0 In all releases after 1 0 0, sync is the default, and async must be explicitly requested if needed
  • synchronization - sync command over NFS - Stack Overflow
    I'm working on a backup system over NFS, and I want to ensure as much as I can that the files are really written to the disk Currently, when doing backups on my local hard disk, I copy everything into a temporary folder, do a sync() to flush the caches, rename the temporary folder to the final name, and do another sync()
  • Ensure that file state on the client is in sync with NFS server
    Coherency in NFS can be achieved, but at the cost of performance, making NFS barely usable (Check its mount options ) NFS is caching like crazy to hide the fact that it is a server file system To make all operations coherent, NFS client would have to go to the NFS server synchronously for every little operation, bypassing the local cache
  • asynchronous - NFS sync vs async - Stack Overflow
    NFS sync vs async Ask Question Asked 12 years, 4 months ago Modified 11 years, 2 months ago Viewed 8k
  • How are the O_SYNC and O_DIRECT flags in open (2) different alike?
    The behaviour of O_DIRECT with NFS will differ from local file systems Older kernels, or kernels configured in certain ways, may not support this combination The NFS protocol does not support passing the flag to the server, so O_DIRECT I O will only bypass the page cache on the client; the server may still cache the I O
  • Track changes in nfs sync nfs over multiple datacenters
    The challenge is to keep the two nfs' in sync For the moment assume that writes will only occur to nfs1, which then has to propagate the changes to nfs2 Periodic generic rsyncs have proved too slow - each rsync takes several hours to complete, even with -az
  • rsync - Fastest way to move 90 million files (270GB) between two NFS . . .
    I need to move 90 million files from a NFS folder to a second NFS folder, both connections to NFS folder are using same eth0, which is 1Gb s to the NFS servers, Sync is not needed, only move (overwrite if it exists) I think my main problem is the number of files, not the total size
  • synchronization - How to force NFS mounted disk to sync to current . . .
    NFS has a file handle per file system object As you rename a directory, the filemhandle did not change and lookup gives you positive result
  • NFS COMMIT operation not being invoked despite fsync being used
    Mounting the server with the sync option changed nothing UPDATE: The plot thickens On Ubuntu Mint 17, Linux kernel 3 13 0, (nfs version: 1 2 8), i set up a loopback mountpoint, with both sync and async options and re-ran the tests Speed differences definitely show a difference between sync and async
  • nfsv4 - NFS performance over high latency is poor, rsync over ssh is . . .
    It would max out at vers=4 1 and only if I did not modify the etc nfs nfs conf or the etc sysconfig nfs files from their original installed state This article mentions Some reviews of NFSv4 and NFSv4 1 suggest that these versions have limited bandwidth and scalability and that NFS slows down during heavy network traffic The bandwidth and





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