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Subject: san redesign and configuration questions
From: Alexander Schalek <as () bacher ! at>
Date: 2007-11-23 3:45:14
Message-ID: F4877CB3D206A24EB2DED55938DE712313D39766F7 () SRVMAX ! bacher ! private
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Hi everyone,
I have some questions for the experts regarding a SAN configuration.
Configuration:
FAS3020c MetroCluster (2 sites, 16km distance)
2 FC-Switches on each site, each connected via ISL's to the other location.
1 RHEL ES4 U5 Host on each site with a 4GB QLogic Dual Port HBA.
Each FC-Port on each Host is connected to one of the switches
FCP enabled and the cf mode is single image
Snapdrive for Linux on both Hosts.
Following situation:
Snapdrive for Linux currently does not support DM-Multipathing on RedHat Linux.
We have an open case with Netapp and they are working on the issue to support \
mulipathing (planned for Q1/08)
When I started I setup everything for multipathing because we thought the support for \
it would be released earlier. I zoned the switches...
Zoning:
switch1 zone1: 0b(filer1)+0b(filer2)+port0(host1)
switch1 zone2: 0b(filer1)+0b(filer2)+port1(host2)
switch2 zone1: 0d(filer1)+0d(filer2)+port1(host1)
switch2 zone2: 0d(filer1)+0d(filer2)+port0(host2)
On the host I implemented DM-MP and use the mpath-Device's to access the LUN's on the \
cluster. Each mpath-Device consists of 4 sdx-Devices(=the 4 paths to the LUN).
Example:
mpath0 (360a98000433464706334455142706e33)
[size=100 MB][features="1 queue_if_no_path"][hwhandler="0"]
\_ round-robin 0 [enabled]
\_ 3:0:1:0 sdd 8:48 [active][ready]
\_ 4:0:1:0 sdf 8:80 [active][ready]
\_ round-robin 0 [enabled]
\_ 3:0:0:0 sdc 8:32 [active][ready]
\_ 4:0:0:0 sde 8:64 [active][ready]
This is working fine. The customer already installed his Oracle RAC on the \
LUN's/mpath-Device's which where presented to the host's.
And here my problem:
The customer can not wait until Q1/08 when Snapdrive for Linux supports multipathing \
on RHEL and I have to redesign the SAN to a single path configuration so SnapDrive is \
working and supported. My questions:
Can I just use the sdx-Devices on the linux host's and leave the zoning and \
multipathing as it is? Will the cluster failover then work correctly?
Or should I deactive multipathing on the hosts and just zone one hba port to one \
filer fc port and use that sdx-Device?
I will have to implement multipathing for sure later when it is supported with linux \
and snapdrive so I prefer minimum or no changes to the current configuration :) Has \
anyone experience with such a problem/configuration?
Thankful for any tips & hints!
Best regards,
Alexander
--
Alexander Schalek, Technical Services / IT-Infrastruktur
Bacher Systems EDV GmbH
FN 54202i, Handelsgericht Wien
Clemens-Holzmeister-Strasse 4
A-1100 Wien, Business Park Vienna, Austria
phone: +43 (1) 60 126-34 | fax: +43 (1) 60 126-4
e-mail: as@bacher.at<mailto:as@bacher.at> | web: www.bacher.at<http://www.bacher.at>
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<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Hi everyone,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>I have some questions for the experts regarding a SAN
configuration.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Configuration:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>FAS3020c MetroCluster (2 sites, 16km \
distance)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>2 FC-Switches on each site, each connected via
ISL’s to the other location.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>1 RHEL ES4 U5 Host on each site with a 4GB QLogic
Dual Port HBA.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Each FC-Port on each Host is connected to one of the
switches<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>FCP enabled and the cf mode is single \
image<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Snapdrive for Linux on both \
Hosts.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Following situation:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Snapdrive for Linux currently does not support
DM-Multipathing on RedHat Linux.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>We have an open case with Netapp and they are working
on the issue to support mulipathing (planned for Q1/08)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>When I started I setup everything for multipathing
because we thought the support for it would be released \
earlier.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>I zoned the switches…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Zoning:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>switch1 zone1: \
0b(filer1)+0b(filer2)+port0(host1)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>switch1 zone2: \
0b(filer1)+0b(filer2)+port1(host2)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>switch2 zone1: \
0d(filer1)+0d(filer2)+port1(host1)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>switch2 zone2: \
0d(filer1)+0d(filer2)+port0(host2)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>On the host I implemented DM-MP and use the
mpath-Device’s to access the LUN’s on the \
cluster.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Each mpath-Device consists of 4 sdx-Devices(=the 4
paths to the LUN).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Example:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>mpath0 \
(360a98000433464706334455142706e33)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>[size=100 MB][features="1
queue_if_no_path"][hwhandler="0"]<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>\_ round-robin 0 [enabled]<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> \_ 3:0:1:0 sdd 8:48 \
[active][ready]<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> \_ 4:0:1:0 sdf 8:80 \
[active][ready]<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>\_ round-robin 0 [enabled]<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> \_ 3:0:0:0 sdc 8:32 \
[active][ready]<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'> \_ 4:0:0:0 sde 8:64 \
[active][ready]<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>This is working fine. The customer already installed
his Oracle RAC on the LUN’s/mpath-Device’s which where presented to
the host’s.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>And here my problem:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>The customer can not wait until Q1/08 when Snapdrive
for Linux supports multipathing on RHEL and I have to redesign the SAN to a
single path configuration so SnapDrive is working and \
supported.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>My questions:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Can I just use the sdx-Devices on the linux
host’s and leave the zoning and multipathing as it \
is?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Will the cluster failover then work \
correctly?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Or should I deactive multipathing on the hosts and just
zone one hba port to one filer fc port and use that \
sdx-Device?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>I will have to implement multipathing for sure later
when it is supported with linux and snapdrive so I prefer minimum or no changes
to the current configuration </span></font><font size=2 face=Wingdings><span
lang=EN-GB style='font-size:10.0pt;font-family:Wingdings'>J</span></font><font
size=2 face=Arial><span lang=EN-GB \
style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Has anyone experience with such a \
problem/configuration?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Thankful for any tips & \
hints!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Best regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Alexander<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:#1F497D'>-- <br>
<b><span style='font-weight:bold'>Alexander Schalek, Technical Services /
IT-Infrastruktur</span></b><br>
<b><span style='font-weight:bold'>Bacher Systems EDV GmbH</span></b><br>
FN 54202i, Handelsgericht Wien<br>
Clemens-Holzmeister-Strasse 4<br>
A-1100 Wien, <st1:PlaceName w:st="on">Business</st1:PlaceName> <st1:PlaceType
w:st="on">Park</st1:PlaceType> <st1:place w:st="on"><st1:City \
w:st="on">Vienna</st1:City>, <st1:country-region \
w:st="on">Austria</st1:country-region></st1:place><br>
phone: +43 (1) 60 126-34 | fax: +43 (1) 60 126-4<br>
e-mail: </span></font><font size=2 color="#1f497d" face=Arial><span lang=DE
style='font-size:10.0pt;font-family:Arial;color:#1F497D'><a
href="mailto:as@bacher.at" title="blocked::mailto:as@bacher.at"><span
lang=EN-GB>as@bacher.at</span></a></span></font><font size=2 color="#1f497d"
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
color:#1F497D'> | web: </span></font><font size=2 color="#1f497d" face=Arial><span
lang=DE style='font-size:10.0pt;font-family:Arial;color:#1F497D'><a
href="http://www.bacher.at" target="_blank"
title="blocked::http://www.bacher.at/"><span \
lang=EN-GB>www.bacher.at</span></a></span></font><font size=2 face=Arial><span \
lang=EN-GB style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
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