Hi, I am a beginner in distributed file systems and I currently work on Glusterfs. I work with 4 VM : srv1, srv2, srv3 and cli1 I tested several types of volume (distributed, replicated, striped ...) which are for me JBOD, RAID 1 and RAID 0. When I try to make a dispersed volume (raid5 / 6) I have a misunderstanding ...
gluster volume create gv7 disperse-data 3 redundancy 1 ipserver1:/data/brick1/gv7 ipserver2:/data/brick1/gv7 ipserver3:/data/brick1/gv7 ipserver4:/data/brick1/gv7 gluster volume info Volume Name: gv7 Type: Disperse Status: Created Number of Bricks: 4 Transport-type: tcp Bricks: Brick1: ipserver1:/data/brick1/gv7 Brick 2 : ipserver 2 :/data/brick 1 /gv 7 Brick3: ipserver3:/data/brick1/gv7 Brick4: ipserver4:/data/brick1/gv7 gluster volume start gv7 m kdir / home/cli1/gv7_dispersed_directory m ount -t glusterfs ipserv er 1:/gv 7 / home/cli1 / gv7_dispersed_directory Now, when i create a file on my moint point (gv7_dispersed_directory) : cd /home/cli1/gv7 _dispersed_directory echo 'hello world !' >> test_file I can see in my srv1 : cd /data/brick1/gv7 cat test hello world ! in my srv2 : cd /data/brick1/gv7 cat test hello world ! in my srv4: cd /data/brick1/gv7 cat test hello world ! but in my srv3 : cd /data/brick1/gv7 cat test hello world ! hello world ! Why?! output of server 3 displays 2 times hello world ! Parity? Redundancy? I don't know... Best regards Alex
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