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On 12/22/2015 10:37 AM, Samir Biswas wrote:<br>
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cite="mid:BN1PR04MB121EDA63A1F9EE28CEC9A2CEAE50@BN1PR04MB121.namprd04.prod.outlook.com"
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<w:LsdException Locked="false" Priority="64" Name="Medium Shading 2 Accent 6"/>
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<w:LsdException Locked="false" Priority="52" Name="Grid Table 7 Colorful Accent 3"/>
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<w:LsdException Locked="false" Priority="52" Name="Grid Table 7 Colorful Accent 4"/>
<w:LsdException Locked="false" Priority="46" Name="Grid Table 1 Light Accent 5"/>
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<w:LsdException Locked="false" Priority="50" Name="Grid Table 5 Dark Accent 5"/>
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<w:LsdException Locked="false" Priority="52" Name="Grid Table 7 Colorful Accent 5"/>
<w:LsdException Locked="false" Priority="46" Name="Grid Table 1 Light Accent 6"/>
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<w:LsdException Locked="false" Priority="52" Name="Grid Table 7 Colorful Accent 6"/>
<w:LsdException Locked="false" Priority="46" Name="List Table 1 Light"/>
<w:LsdException Locked="false" Priority="47" Name="List Table 2"/>
<w:LsdException Locked="false" Priority="48" Name="List Table 3"/>
<w:LsdException Locked="false" Priority="49" Name="List Table 4"/>
<w:LsdException Locked="false" Priority="50" Name="List Table 5 Dark"/>
<w:LsdException Locked="false" Priority="51" Name="List Table 6 Colorful"/>
<w:LsdException Locked="false" Priority="52" Name="List Table 7 Colorful"/>
<w:LsdException Locked="false" Priority="46" Name="List Table 1 Light Accent 1"/>
<w:LsdException Locked="false" Priority="47" Name="List Table 2 Accent 1"/>
<w:LsdException Locked="false" Priority="48" Name="List Table 3 Accent 1"/>
<w:LsdException Locked="false" Priority="49" Name="List Table 4 Accent 1"/>
<w:LsdException Locked="false" Priority="50" Name="List Table 5 Dark Accent 1"/>
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<w:LsdException Locked="false" Priority="52" Name="List Table 7 Colorful Accent 1"/>
<w:LsdException Locked="false" Priority="46" Name="List Table 1 Light Accent 2"/>
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<w:LsdException Locked="false" Priority="52" Name="List Table 7 Colorful Accent 2"/>
<w:LsdException Locked="false" Priority="46" Name="List Table 1 Light Accent 3"/>
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<w:LsdException Locked="false" Priority="52" Name="List Table 7 Colorful Accent 3"/>
<w:LsdException Locked="false" Priority="46" Name="List Table 1 Light Accent 4"/>
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<w:LsdException Locked="false" Priority="48" Name="List Table 3 Accent 4"/>
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<w:LsdException Locked="false" Priority="52" Name="List Table 7 Colorful Accent 4"/>
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<w:LsdException Locked="false" Priority="49" Name="List Table 4 Accent 5"/>
<w:LsdException Locked="false" Priority="50" Name="List Table 5 Dark Accent 5"/>
<w:LsdException Locked="false" Priority="51" Name="List Table 6 Colorful Accent 5"/>
<w:LsdException Locked="false" Priority="52" Name="List Table 7 Colorful Accent 5"/>
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<div class="WordSection1">
<p class="MsoNormal"><a moz-do-not-send="true"
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.
</span></p>
</div>
</blockquote>
hi Samir,<br>
Yes, your guess is correct, this usage is not supported, we
expect the new brick to be empty. People who know gluster enough
have done this by syncing data directly from the good brick to new
brick using rsync etc keeping glusterfs mounts offline. I am curious
to know about this case. Could you please elaborate on the kind of
maintenance/fixing you need to do on the brick which needs
replace-brick again?<br>
<br>
Pranith<br>
<blockquote
cite="mid:BN1PR04MB121EDA63A1F9EE28CEC9A2CEAE50@BN1PR04MB121.namprd04.prod.outlook.com"
type="cite">
<div class="WordSection1">
<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">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">
<!--[if !supportLineBreakNewLine]--><br
style="mso-special-character:line-break">
<!--[endif]--></span><o:p></o:p></p>
</div>
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