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, ?? <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 an SSD? 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:* ?? <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, ?? 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
