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| [root@centos-linux ~]$ gluster volume set help|grep read-hash-mode -A7
Option: cluster.read-hash-mode
Default Value: 1
Description: inode-read fops happen only on one of the bricks in replicate. AFR will prefer the one computed using the method specified using this option.
0 = first readable child of AFR, starting from 1st child.
1 = hash by GFID of file (all clients use same subvolume).
2 = hash by GFID of file and client PID.
3 = brick having the least outstanding read requests.
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