Hi, One of my gluster deployment requires to completely disable Gluster caching and put in proprietary caching logic. Setup is as follows:
- PCI flash will be used as flash - Two node connected using 40GB Melanox cards - Gluster version 3.7.6 With fresh installation of Gluster, using fio with libgapi with bs=1M/4M, seq_write i am able to achieve speeds up to 2.4GB/s from user point of view. When i check the raw flash speed, seeing bandwidth of 1.1GB/s but flash is capable of getting speeds of 1.5GB/s. Before putting in our own cache, i disabled Gluster caching by disabling below options and measured fio speed gluster vol set $vol_name performance.io-cache off gluster vol set $vol_name performance.write-behind off gluster vol set $vol_name performance.flush-behind off service glusterd restart [ $vol_name was my name name passed in shell script ] With the above parameters disabled, i was drop in fio speed ( as expected ) to around 1.4GB/s but raw flash speed measured was around 250-350MB/s using iostat. This shows that Gluster caching might not be completely disabled or i am missing some piece of information. Please provide your valuable inputs if any other settings need to be disabled. -Prashanth
_______________________________________________ Gluster-users mailing list Gluster-users@gluster.org http://www.gluster.org/mailman/listinfo/gluster-users
