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Subject: RE: Cougar to Bobcat migration strategy document for review
Date: Thu, 14 Feb 2008 16:09:19 -0800
Message-ID: <BB375AF679D4A34E9CA8DFA650E2B04E0856E776@onstor-exch02.onstor.net>
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Thread-Topic: Cougar to Bobcat migration strategy document for review
Thread-Index: AchpodZPB1Qz2CcxRe6MoPEft3LLGAFwsTqA
From: "Raj Kumar" <raj.kumar@onstor.com>
To: "Sripal Surendiran (HCL)" <sripal.surendiran@onstor.com>,
	"dl-Design Review" <dl-designreview@onstor.com>

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Hi all,

=20

Is everybody ok with this requirement?

=20

1.	"Migration requires downtime of the entire Bobcat cluster.

=20

The following operation will add up to the total downtime while we
migrate from BC to CG.

=20

For Each node in a cluster:

=20

1.	Power down BC and take care removing all cables, label them,
remove power cable, flash cards, label them.
2.	Remove BC from the rack
3.	mount cougar
4.	Installing FP/FC cables and modifying MAC and rebooting it
again.
5.	Usual boot up time + updating config from 2ndry flash

=20

The above tasks can take anywhere between 50 minutes to 2 hours depends
on the racking conditions and/or labor skills/availability.=20

=20

If you have a 2 node, total down time: 1 hours 40 minutes to 4 hours

If you have 4 node: 3 hours 20 minutes to 8 hours.

=20

We need to be prepared for the worst case scenario as well. If for any
reason we run into some issues bringing up services in cougar, we will
need to revert back to BC. It will be the same time it takes to migrate
to cougar.

=20

Is this downtime acceptable?=20

=20

Did we consider some kind of rolling upgrade? Possibly supporting BC-CG
cluster just for upgrade purposes?

=20

Thanks.

=20

=20

________________________________

From: Sripal Surendiran (HCL)=20
Sent: Thursday, February 07, 2008 8:07 AM
To: dl-Design Review
Cc: Sripal Surendiran (HCL)
Subject: Cougar to Bobcat migration strategy document for review

=20

Hi all,

=20

PFA Bobcat to Cougar migration strategy functional specification
document. Please do respond me with your review comments.

=20

Regards,

Sripal.


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<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Hi =
all,<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Is everybody ok with this =
requirement?<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<ol style=3D'margin-top:0in' start=3D1 type=3D1>
 <li class=3DMsoNormal style=3D'text-align:justify;mso-list:l0 level1 =
lfo1'><font
     size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
     Arial;color:navy'>&#8220;</span></font>Migration requires downtime =
of the
     entire Bobcat cluster.<o:p></o:p></li>
</ol>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>The following operation will add up =
to the
total downtime while we migrate from BC to =
CG.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>For Each node in a =
cluster:<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<ol style=3D'margin-top:0in' start=3D1 type=3D1>
 <li class=3DMsoNormal style=3D'color:navy;mso-list:l1 level1 =
lfo2'><font size=3D2
     color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>Power
     down BC and take care removing all cables, label them, remove power =
cable,
     flash cards, label them.<o:p></o:p></span></font></li>
 <li class=3DMsoNormal style=3D'color:navy;mso-list:l1 level1 =
lfo2'><font size=3D2
     color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>Remove
     BC from the rack<o:p></o:p></span></font></li>
 <li class=3DMsoNormal style=3D'color:navy;mso-list:l1 level1 =
lfo2'><font size=3D2
     color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>mount
     cougar<o:p></o:p></span></font></li>
 <li class=3DMsoNormal style=3D'color:navy;mso-list:l1 level1 =
lfo2'><font size=3D2
     color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>Installing
     FP/FC cables and modifying MAC and rebooting it =
again.<o:p></o:p></span></font></li>
 <li class=3DMsoNormal style=3D'color:navy;mso-list:l1 level1 =
lfo2'><font size=3D2
     color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'>Usual
     boot up time + updating config from 2ndry =
flash<o:p></o:p></span></font></li>
</ol>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>The above tasks can take anywhere =
between 50
minutes to 2 hours depends on the racking conditions and/or labor =
skills/availability.
<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>If you have a 2 node, total down =
time: 1
hours 40 minutes to 4 hours<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>If you have 4 node: 3 hours 20 =
minutes to
8 hours.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>We need to be prepared for the =
worst case
scenario as well. If for any reason we run into some issues bringing up
services in cougar, we will need to revert back to BC. It will be the =
same time
it takes to migrate to cougar.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Is this downtime acceptable? =
<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Did we consider some kind of =
rolling
upgrade? Possibly supporting BC-CG cluster just for upgrade =
purposes?<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Thanks.<o:p></o:p></span></font></p>=


<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<div>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>

<hr size=3D2 width=3D"100%" align=3Dcenter tabindex=3D-1>

</span></font></div>

<p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'> =
Sripal
Surendiran (HCL) <br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Thursday, February =
07, 2008
8:07 AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> dl-Design Review<br>
<b><span style=3D'font-weight:bold'>Cc:</span></b> Sripal Surendiran =
(HCL)<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> Cougar to Bobcat
migration strategy document for review</span></font><o:p></o:p></p>

</div>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<div>

<p class=3DMsoNormal><font size=3D2 color=3Dblack face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:black'>Hi =
all,</span></font><o:p></o:p></p>

</div>

<div>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

</div>

<div>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>PFA Bobcat to Cougar migration strategy functional
specification document. Please do respond me with your review =
comments.</span></font><o:p></o:p></p>

</div>

<div>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>&nbsp;<o:p></o:p></span></font></p>

</div>

<div>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Regards,</span></font><o:p></o:p></p>

</div>

<div>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Sripal.</span></font><o:p></o:p></p>

</div>

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