CPU LOAD AVRG + how to deal process with D state

we can see from our RHEL 7.6 server ( kernel version - 3.10.0-957.el7.x86_64 ) that following process are with D state ( they runs from HDFS user ) Note - *D state code means that process is in uninterruptible sleep* ps -eo s,user,cmd | grep ^[RD] D hdfs du -sk /grid/sdj/hadoop/hdfs/data/current/BP-1018134753-10.3.6.170-1530088122990 D hdfs du -sk /grid/sdm/hadoop/hdfs/data/current/BP-1018134753-10.3.6.170-1530088122990 R root ps -eo s,user,cmd note's - the disks sdj and sdm are 3T byte size , also "du -sk" happens on other disks as sdd , sdf etc and the disks are with ext4 file-system we are suspect that the fact that we have high CPU load avrg is because the "du -sk" that actually run on the disks so I was thinking what we can do regarding to below behavior one option is maybe to disable the "du -sk" verification from HDFS , but no clue how to do that second option is to think what actually cause the D state ? I don't sure ... but maybe upgrade the kernel version will help to avoid D state? or else? ( like disable the CPU Thread(s) ) , etc ? more details lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 48 On-line CPU(s) list: 0-47 Thread(s) per core: 2 Core(s) per socket: 12 Socket(s): 2 NUMA node(s): 2 Vendor ID: GenuineIntel CPU family: 6 and CPU LOAD AVRG is around ~ 42-45 ( for 15min avrg ) Reference : https://community.cloudera.com/t5/Support-Questions/Does-hadoop-run-dfs-du-automatically-when-a-new-job-starts/td-p/231297 https://community.cloudera.com/t5/Support-Questions/Can-hdfs-dfsadmin-and-hdfs-dsfs-du-be-taxing-on-my-cluster/m-p/182402 https://community.pivotal.io/s/article/Dealing-with-Processes-in-State-D---Uninterruptible-Sleep-Usually-IO?language=en_US https://www.golinuxhub.com/2018/05/how-to-disable-or-enable-hyper/