[Gluster-users] Gluster 3.5.2 gluster, how does cache work?

[Pranith Kumar Karampuri]

It is loaded on the fuse mount process, so client side.

Pranith
On 08/22/2014 01:37 AM, Juan José Pavlik Salles wrote:
> Hi guys, I've been reading a bit about caching in gluster volumes, but 
> I still don't get a few things. I set up a gluster replica 2 volume 
> like this:
>
> [root at gluster-test-1 ~]# gluster vol info vol_rep
> Volume Name: vol_rep
> Type: Replicate
> Volume ID: b77db06d-2686-46c7-951f-e43bde21d8ec
> Status: Started
> Number of Bricks: 1 x 2 = 2
> Transport-type: tcp
> Bricks:
> Brick1: gluster-test-1:/ladrillos/l1/l
> Brick2: gluster-test-2:/ladrillos/l1/l
> Options Reconfigured:
> performance.cache-min-file-size: 90MB
> performance.cache-max-file-size: 256MB
> performance.cache-refresh-timeout: 60
> performance.cache-size: 256MB
> [root at gluster-test-1 ~]#
>
> Then I mounted the volume with gluster client on another machine. I 
> created an 80Mbytes file called 80, and here you have the reading test:
>
> [root at gluster-client-1 gluster_vol]# dd if=/mnt/gluster_vol/80 
> of=/dev/null bs=1M
> 80+0 records in
> 80+0 records out
> 83886080 bytes (84 MB) copied, 1,34145 s, 62,5 MB/s
> [root at gluster-client-1 gluster_vol]# dd if=/mnt/gluster_vol/80 
> of=/dev/null bs=1M
> 80+0 records in
> 80+0 records out
> 83886080 bytes (84 MB) copied, 0,0246918 s, 3,4 GB/s
> [root at gluster-client-1 gluster_vol]# dd if=/mnt/gluster_vol/80 
> of=/dev/null bs=1M
> 80+0 records in
> 80+0 records out
> 83886080 bytes (84 MB) copied, 0,0195678 s, 4,3 GB/s
> [root at gluster-client-1 gluster_vol]#
>
> Cache is working flawlessly, (even though that 80 Mbytes is smaller 
> than the min-file-size value, but I don't care about it right now) 
> what I don't get is where cache is being stored. Is it stored on the 
> client side or on the server side? According to documentation, the 
> io-cache translator could be loaded on both sides (client and server), 
> how can I know where it is being loeaded? It looks like as it was 
> being stored locally because of the speed, but I'd like to be sure.
>
> Thanks!
>
> -- 
> Pavlik Salles Juan José
> Blog - http://viviendolared.blogspot.com
>
>
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