[Gluster-devel] [Gluster-users] [Linux-cachefs] Can I use FSCache/Cachefiles with Gluster Native Client mode?

[Anand Avati]

I believe FSCache must first be implemented in FUSE before any userspace
filesystem (like GlusterFS) can make use of it?

Avati

On Wed, Dec 5, 2012 at 1:29 AM, 吴巍 <wuwei.tsh at gmail.com> wrote:

> **
> Now I'm sure that Gluster FS native client don't support FSCache. There
> are no codes about FSCache in the source code of Gluster FS.
> the command  "mount -t glusterfs server1:/test-volume /mnt/glusterfs -o
> fsc"  will be executed by /sbin/mount.glusterfs, and the "-o fsc" option
> will be ignored silently.
>
> Thanks for everybody.
>
> ------------------------------
>  Wei Wu
>
>  *From:* Suresh Jayaraman <sjayaraman at suse.com>
> *Date:* 2012-12-05 15:06
> *To:* 吴巍 <wuwei.tsh at gmail.com>
> *CC:* Ric Wheeler <ricwheeler at gmail.com>; gluster-users<gluster-users at gluster.org>;
> linux-cachefs <linux-cachefs at redhat.com>; gluster-devel<gluster-devel at nongnu.org>
> *Subject:* Re: [Linux-cachefs] [Gluster-devel] Can I use
> FSCache/Cachefiles with Gluster Native Client mode?
>  On 12/03/2012 05:59 PM, Ric Wheeler wrote:
> > On 12/02/2012 10:29 PM, 吴巍 wrote:
> >> Hey,
> >>
> >> I Download the GlusterFS 3.2.7 Release and it works well. And I want
> >> to improve the reading performance with FSCache/Cachefiles model.
> >> I use the command line:
> >> mount -t glusterfs server1:/test-volume /mnt/glusterfs -o fsc
> >> and no error reported. But the local cache function of FSCache is not
>
> Does Glusterfs support fscache? File systems typically have to be
> modified to include support for fscache (see fs/cifs/fscache*.[c,h] or
> fs/nfs/fscache*.[c,h] in the kernel source for example). IOW, they have
> to be fscache aware to be able to use the persistent disk caching.
>
> Have you checked if the option 'fsc' is being silently ignored? Try
> mounting with '-vvv' to see whether it reveals more.
>
> What do you mean by "local cache function of FSCache is not active"? Did
> you mean that the files are not getting cached? or File are not being
> fetched from the cache when re-read?
>
> If it is already supported, are you running the cachefilesd user-space
> daemon?
>
> FS-Cache by default uses /var/cache/fscache dir for caching. You could
> check whether the cached files are being seen there.
>
> Also, /proc/fs/fscache/stats might reveal more details about pages
> marked for caching, retrieved successfully from cache or cache returned
>  -ENODATA etc.
>
> >> active. How can I use the local cache function of FSCache with Gluster
> >> Native Client  mount mode?
> >>
> > Adding in the fscache list to see if anyone there has experimented with
> > this,
> >
>
>
> --
> Suresh Jayaraman
>
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>
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