[Gluster-devel] [Gluster-users] iostat not showing data transfer while doing read operation with libgfapi

[satish kondapalli]

Hi

iostat i am not running on Network interface.  I am running on my storage
device( SSD card:: iostat /dev/nvme0n1 1).

Sateesh

On Tue, Nov 10, 2015 at 1:47 AM, Piotr Rybicki <piotr.rybicki at innervision.pl
> wrote:

> W dniu 2015-11-10 o 04:01, satish kondapalli pisze:
>
> Hi,
>>
>> I am running performance  test between fuse vs libgfapi.  I have a
>> single node, client and server are running on same node. I have NVMe SSD
>> device as a storage.
>>
>> My volume info::
>>
>> [root at sys04 ~]# gluster vol info
>> Volume Name: vol1
>> Type: Distribute
>> Volume ID: 9f60ceaf-3643-4325-855a-455974e36cc7
>> Status: Started
>> Number of Bricks: 1
>> Transport-type: tcp
>> Bricks:
>> Brick1: 172.16.71.19:/mnt_nvme/brick1
>> Options Reconfigured:
>> performance.cache-size: 0
>> performance.write-behind: off
>> performance.read-ahead: off
>> performance.io-cache: off
>> performance.strict-o-direct: on
>>
>>
>> fio Job file::
>>
>> [global]
>> direct=1
>> runtime=20
>> time_based
>> ioengine=gfapi
>> iodepth=1
>> volume=vol1
>> brick=172.16.71.19
>> rw=read
>> size=128g
>> bs=32k
>> group_reporting
>> numjobs=1
>> filename=128g.bar
>>
>> While doing sequential read test, I am not seeing any data transfer on
>> device with iostat tool.  Looks like gfapi engine is reading from the
>> cache because i am reading from same file with different block sizes.
>>
>> But i disabled  io cache  for my volume. Can someone help me  from where
>> fio is reading the data?
>>
>
> Hi.
>
> It is normal - not seeing traffic on ethernet interface, when using native
> RDMA protocol (not TCP via IPoIB).
>
> Try perfquery -x , to see traffic counters increase on RDMA interface.
>
> Regards
> Piotr Rybicki
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