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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Some questions about GFS behavior during a node failure in a
2 nodes cluster:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<ol style='margin-top:0in' start=1 type=1>
<li class=MsoNormal style='mso-list:l0 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Upon a node failure, the
remaining node is held off from any metadata changes until the failed node
is fenced and its journal is replayed.</span></font> <font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></li>
<ol style='margin-top:0in' start=1 type=a>
<li class=MsoNormal style='mso-list:l0 level2 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>The remaining node won’t
be able to open or create any new files, correct?</span></font> <font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></li>
<li class=MsoNormal style='mso-list:l0 level2 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Would the remaining node be
able to read from files opened before the failure?</span></font> <font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></li>
</ol>
</ol>
<p class=MsoNormal style='margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:
-9.0pt;mso-list:l0 level3 lfo1'><![if !supportLists]><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><span style='mso-list:Ignore'><font
size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font>i.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><span dir=LTR><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>What if the files
were opened by the failed node at the time of the failure?<o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:
-9.0pt;mso-list:l0 level3 lfo1'><![if !supportLists]><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><span style='mso-list:Ignore'><font
size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font>ii.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><span dir=LTR><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>Would the answers
above change if the files were opened with O_DIRECT?<o:p></o:p></span></font></span></p>
<ol style='margin-top:0in' start=1 type=1>
<ol style='margin-top:0in' start=3 type=a>
<li class=MsoNormal style='mso-list:l0 level2 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Would the remaining node be
able to write to files opened before the failure?</span></font> <font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></li>
</ol>
</ol>
<p class=MsoNormal style='margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:
-9.0pt;mso-list:l0 level3 lfo1'><![if !supportLists]><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><span style='mso-list:Ignore'><font
size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font>i.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><span dir=LTR><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>What if the files
were opened by the failed node too?<o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:
-9.0pt;mso-list:l0 level3 lfo1'><![if !supportLists]><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><span style='mso-list:Ignore'><font
size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font>ii.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><span dir=LTR><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>What if the data to
be written is bigger than GFS’ “resource group”? Would the
node be able to get a new resource group to continue writing?<o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:
-9.0pt;mso-list:l0 level3 lfo1'><![if !supportLists]><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><span style='mso-list:Ignore'><font
size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font>iii.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><span dir=LTR><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>Would fsync to the
file work?<o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:
-9.0pt;mso-list:l0 level3 lfo1'><![if !supportLists]><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><span style='mso-list:Ignore'><font
size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font>iv.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><span dir=LTR><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>Would fdatasync to
the file work?<o:p></o:p></span></font></span></p>
<p class=MsoNormal style='margin-left:1.5in;text-indent:-1.5in;mso-text-indent-alt:
-9.0pt;mso-list:l0 level3 lfo1'><![if !supportLists]><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><span style='mso-list:Ignore'><font
size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font>v.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><span dir=LTR><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>Would the answers
above change if the files were opened with O_DIRECT? <o:p></o:p></span></font></span></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<ol style='margin-top:0in' start=2 type=1>
<li class=MsoNormal style='mso-list:l0 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I am concerned on the long time
it might take to GFS to perform fsck. We have experienced very long fsck
times.</span></font> <font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p></o:p></span></font></li>
<ol style='margin-top:0in' start=1 type=a>
<li class=MsoNormal style='mso-list:l0 level2 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Is GFS fsck journal based? <o:p></o:p></span></font></li>
<li class=MsoNormal style='mso-list:l0 level2 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>How long is it expected to
take?</span></font> <font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p></o:p></span></font></li>
<li class=MsoNormal style='mso-list:l0 level2 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Do you have any information
about GFS fsck and the means to tune it?</span></font> <font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></li>
</ol>
</ol>
<p class=MsoNormal style='margin-left:.25in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks a lot,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Samuel.<o:p></o:p></span></font></p>
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