[Gluster-users] [Linux-cachefs] [Gluster-devel] Can I use FSCache/Cachefiles with Gluster Native Client mode?
sjayaraman at suse.com
Thu Dec 6 09:17:58 UTC 2012
On 12/06/2012 12:24 AM, Anand Avati wrote:
> I believe FSCache must first be implemented in FUSE before any userspace
> filesystem (like GlusterFS) can make use of it?
Sounds about right to me. Then, FUSE can ask FS-Cache to store / fetch
data on behalf of Glusterfs.
> On Wed, Dec 5, 2012 at 1:29 AM, 吴巍 <wuwei.tsh at gmail.com
> <mailto:wuwei.tsh at gmail.com>> wrote:
> Now I'm sure that Gluster FS native client don't support FSCache.
But wait, why do you really need FS-Cache in your case? If improving
(re)-read performance is what matters to you, have you already taken a
look at the IO-Cache translator the Glusterfs provides?
Do you have a really slow network? Do you intend to keep your cache on
Note that FS-Cache/Cachefiles is not supposed to improve performance for
all kinds of workloads.
May be one way to know if your workload can benefit with FS-Cache or not is:
- enable FS-Cache in NFS and try accessing the Gluster namespace via NFS
- compare its performance with FS-Cache on NFS disabled
> 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 <mailto:sjayaraman at suse.com>
> *Date:* 2012-12-05 15 <tel:2012-12-05%C2%A015>:06
> *To:* 吴巍 <mailto:wuwei.tsh at gmail.com>
> *CC:* Ric Wheeler <mailto:ricwheeler at gmail.com>; gluster-users
> <mailto:gluster-users at gluster.org>; linux-cachefs
> <mailto:linux-cachefs at redhat.com>; gluster-devel
> <mailto: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
> 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,
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