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<p class="MsoNormal"><a name="_MailOriginal">Hi All,<o:p></o:p></a></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">Glusterfs does self-healing when replace brick command is issued to change brick from one to another.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">But it also can happen that we can replace a brick which was attached earlier to the replica pair and have old data in it.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">There could be some modification of files in the new brick and then moved to old brick. The files which are modified
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">new brick are not healed to old brick but newly added files are healed immediately.
<br>
<br>
Below example that I tried<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">Replica 3 pair of nodes as below:
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">Node 1: 10.132.10.50 (blr-7)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">Node 2: 10.132.10.110 (blr-20)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">Node 3: 10.132.10.56 (blr-12)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><b>Step 1: Issue brick replace to new node(blr-12)<br>
</b>[root@v3blr7 ~]# gluster volume replace-brick vs 10.132.10.110:/home/sameer/setup_2/blr-20 10.132.10.56:/home/sameer/setup_2/blr-12 commit force<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">volume replace-brick: success: replace-brick commit force operation successful<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">[root@v3blr7 ~]#<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><b>Step 2: healing started<o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">[root@v3blr12 blr-12]# gluster volume heal vs info<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">Brick 10.132.10.50:/home/sameer/setup_2/blr-7<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">/heal_issue.0.0 - Possibly undergoing heal<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">/heal_issue.1.0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">Number of entries: 2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">Brick 10.132.10.56:/home/sameer/setup_2/blr-12<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="mso-bookmark:_MailOriginal">Number of entries: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><b>After Healing is finished:
<o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">[root@v3blr12 blr-12]# [root@v3blr12 blr-12]# ls -lh<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">total 2.1G<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">-rw-r--r--. 2 root root 1.0G Dec 13 23:26 heal_issue.0.0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">-rw-r--r--. 2 root root 1.0G Dec 13 23:26 heal_issue.1.0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">[root@v3blr12 blr-12]#<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><b>Step 3: Run FIO to update the files and create two more files.
<o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">[root@v3blr7 blr-7]# ls -lh<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">total 8.1G<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">-rw-r--r--. 2 root root 2.0G Dec 13 23:33 heal_issue.0.0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">-rw-r--r--. 2 root root 2.0G Dec 13 23:33 heal_issue.1.0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">-rw-r--r--. 2 root root 2.0G Dec 13 23:33 heal_issue.2.0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">-rw-r--r--. 2 root root 2.0G Dec 13 23:33 heal_issue.3.0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">[root@v3blr7 blr-7]#<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><b>Step 4: Issue replace brick to old brick(from blr-12 to blr-20)<o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">[root@v3blr7 ~]# gluster volume replace-brick vs 10.132.10.56:/home/sameer/setup_2/blr-12 10.132.10.110:/home/sameer/setup_2/blr-20 commit force<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">volume replace-brick: success: replace-brick commit force operation successful<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><b><o:p> </o:p></b></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><b>Step 4: Healing finished to failed node<o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">[root@v3blr20 blr-20]# gluster v heal vs info<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">Brick 10.132.10.50:/home/sameer/setup_2/blr-7<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">Number of entries: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">Brick 10.132.10.110:/home/sameer/setup_2/blr-20<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">Number of entries: 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><b>Step 5: File size of failed nodes<o:p></o:p></b></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">[root@v3blr20 blr-20]# ls -lh<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">total 6.1G<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">-rw-r--r--. 2 root root 1.0G Dec 14 10:00 heal_issue.0.0 <=====
<b><span style="color:#C00000">File size is 1gb. did not heal</span></b><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">-rw-r--r--. 2 root root 1.0G Dec 14 10:00 heal_issue.1.0 <=====
<b><span style="color:#C00000">File size is 1gb. did not heal</span></b><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">-rw-r--r--. 2 root root 2.0G Dec 14 10:03 heal_issue.2.0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">-rw-r--r--. 2 root root 2.0G Dec 14 10:03 heal_issue.3.0<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="mso-bookmark:_MailOriginal">[root@v3blr20 blr-20]#<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">The old files which are modified to other replica is not synced here and even it won’t show as split-brain too.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">How will users get informed that modified files are not synced? This seems an issue !!!!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">Does glusterfs not allow to reuse(replace-brick) old brick which could have data? If not, there is need of
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">healing data 2 times if there gets some issue in one brick and adding that fixing the brick. Seems this is not good idea to do.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">Does anyone face this issue? Or this could be issue in glusterfs itself. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_MailOriginal">Thanks and regards,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="mso-bookmark:_MailOriginal">Samir Biswas<br style="mso-special-character:line-break">
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