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Cache Mounted Filesystem
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Cache Mounted Filesystem

imgmoneyimgmoney Member

Hi All,

I wanted to know whether it is possible to cache all the files locally for the mounted file system.

Example: our web server access the content from this folder

/mount/media/

I have mounted the folder via GlusterFS

What I want to do is, I want our web server to write and read to the same mount locally. And then those changes moved to GlusterFS which is on the same mount point.

Why I need this ?

I tried setting up files locally and I see the response times have improved a lot my 100%

But when I use GlusterFS the response time is almost doubled.

So I wanted to know which is the right option to do the caching for FUSE mounted system.

Comments

  • devpdevp Member

    You can read a Linux Primer.

  • eva2000eva2000 Member
    edited May 18

    So many GlusterFS cache and performance settings to tweak https://docs.gluster.org/en/main/Administrator-Guide/Performance-Tuning/

  • imgmoneyimgmoney Member
    edited May 18

    @eva2000 said:
    So many GlusterFS cache and performance settings to tweak https://docs.gluster.org/en/main/Administrator-Guide/Performance-Tuning/

    Already tried all of them. Still, the performance remains the same. I am looking for something like rlcone use vfs caching.

    In rclone, it will cache everything locally and then it stores it at the storage later.

    I tried setting up GluserFS > SFTP > RClone, it breaks.

    Any alternative to GFS but have superior performance ?

  • devpdevp Member
    edited May 18

    @imgmoney said: What I want to do is, I want our web server to write and read to the same mount locally. And then those changes moved to GlusterFS which is on the same mount point.

    Here you want to use same mount point for local and remote.

    @imgmoney said: In rclone, it will cache everything locally and then it stores it at the storage later.

    Here you want to store things locally and later transfer that to other locations meaning your are using a local mount point and using sftp to transfer to larger storage.

    These are different implementations.

  • jarjar Patron Provider
    edited May 18

    Ditch gluster, use an rsync cron. You're overcomplicating this, gluster needs to be between local systems with a quick connection to each other. Gluster over internet is at best mildly acceptable for a few light use cases.

  • imgmoneyimgmoney Member

    @jar said: Ditch gluster, use an rsync cron.

    I am already using lsyncd to sync files from the master to all the slaves. This will be used when we deploy codes to master and make those files available in all slaves.

    But I need to have a few folders which need to be available on all the slaves as shared storage. So GlusterFS or NFS is the choice over here.

    If I want to use lsyncd, then it needs to be a muti master setup as those folders and files need to be available in master and all the slaves (changes will happen in master and all slaves too).

    Any suggestion?

    Thanked by 1jar
  • imgmoneyimgmoney Member
    edited May 18

    @jar said: Gluster over internet is at best mildly acceptable for a few light use cases.

    I am using GlusterFS in local connection only.

    The performance difference am seeing is

    1) If all the web servers files are available in local storage , 300ms (add to cart), IOPS 52K for Read and 18K for Write

    2) If core files are in local and shared files (media, static and few other) in GlusterFS, 1.4s (add to cart) , IOPS 10K Read and 3K for Write

    Thanked by 1jar
  • stefemanstefeman Member
    edited May 18

    Rclone + MergerFS is the correct way to do it. At least thats what I prefer. Also supports linux hard links.

    Especially if its random files or media.

    Its probly the best way to handle FUSE mounts over WAN, and you can define local cache like you want.

    Thanked by 1darkimmortal
  • rm_rm_ Member
    edited May 18

    @imgmoney said: I wanted to know whether it is possible to cache all the files locally for the mounted file system.

    There is FSCache specifically for this purpose:
    https://blog.frehi.be/2019/01/03/fs-cache-for-nfs-clients/
    https://www.admin-magazine.com/HPC/Articles/Caching-with-CacheFS

    Speaking of which, it's also in the process of being heavily remodelled:
    https://www.phoronix.com/scan.php?page=news_item&px=Linux-Rewrite-fscache-cachefile

    Personally never tried it, so cannot say how well it works. But I can confirm that GlusterFS response times are a multiple of the ping times between nodes, which quickly comes unusable if you run it over a distance on the Internet.

    Thanked by 1lanefu
  • imgmoneyimgmoney Member
    edited May 18

    @rm_ said: Personally never tried it, so cannot say how well it works. But I can confirm that GlusterFS response times are a multiple of the ping times between nodes, which quickly comes unusable if you run it over a distance on the Internet.

    The ping time between the nodes is less than 1ms as I am using 10Gigabit LAN. I believe my application requires much better IOPS for better response time in the front end. So only the local cache on the mounted server is the only solution.

  • imgmoneyimgmoney Member

    @stefeman said: Rclone + MergerFS

    Is it possible to use FUSE mounts via Rclone?

  • kzedkzed Member

    @stefeman said: Rclone + MergerFS is the correct way to do it. At least thats what I prefer. Also supports linux hard links.

    interested to know how you use MergerFS to able create hardlink/symlink. AFAIK rclone mount currently doesn't support symlink yet. i tried use MergerFS on top of Rclone mount but still can't create symlink. :/

  • agonyztagonyzt Member

    https://github.com/kahing/catfs could be an option. The readme actually lists a few other similar projects.

  • eva2000eva2000 Member

    Thanks for sharing! Been playing with juicefs and Cloudflare R2 object storage and like it a lot. My write up for juicefs + Cloudflare R2 at https://github.com/centminmod/centminmod-juicefs :)

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