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
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