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Subject: RE: FC path recovery
Date: Wed, 15 Aug 2007 03:53:40 -0800
Message-ID: <BB375AF679D4A34E9CA8DFA650E2B04E04FA8013@onstor-exch02.onstor.net>
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Thread-Topic: FC path recovery
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References: <BB375AF679D4A34E9CA8DFA650E2B04E04FA7ECD@onstor-exch02.onstor.net> <BB375AF679D4A34E9CA8DFA650E2B04E0267A4AE@onstor-exch02.onstor.net>
From: "Steffen Thuemmel" <steffen.thuemmel@onstor.com>
To: "Sandrine Boulanger" <sandrine.boulanger@onstor.com>,
	"Rich LaReau" <rich.lareau@onstor.com>,
	"dl-cstech" <dl-cstech@onstor.com>

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Sandrine,

Is the scsi move command permanent ? What happens after a reboot ? I'd
guess the auto scsi discovery will "destroy" the scsi move results ?

Regards,=20
=20
st.
=20
Steffen Thuemmel=20
=20
ONStor GmbH
=20
telf.      +49 6102 884 84-0
mobil.     +49 173 673 3434
mail.       steffen.thuemmel@onstor.com


		_____________________________________________
		From: Sandrine Boulanger=20
		Sent: Mittwoch, 15. August 2007 01:23
		To: Rich LaReau; dl-cstech
		Subject: RE: FC path recovery
	=09

	=09

		_____________________________________________
		From: Rich LaReau=20
		Sent: Tuesday, August 14, 2007 4:15 PM
		To: dl-cstech
		Subject: FC path recovery

	=09
		I understand that as a filer discovers luns, it will
alternate which FC path to take on a per-storage array basis.  So
normally we expect half the luns to be on each of the two FC ports. =20
		> we should see the paths from both FC ports. If you do
a scsi show detail on a device, it should show 2 paths

		Now if we lose one path, all the luns move to the
surviving port.  What happens when the second path is restored? =20
		> it depends how "scsi failback" is set. If enable,  the
original path will be used when it's restored.


		Do they split up again on their own?  Can I move them
back manually?  Do I need to offline and rediscover everything in order
to get my paths redistributed?
		> scsi move command can be used to move luns manually=20
	=09
		Thanks,
		Rich
	=09

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<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#1F497D" FACE=3D"Calibri">Sandrine,</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#1F497D" FACE=3D"Calibri">Is the</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> <FONT COLOR=3D"#000080" =
SIZE=3D2 FACE=3D"Arial">scsi move command</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT COLOR=3D"#000080" =
SIZE=3D2 FACE=3D"Arial"> permanent ?</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> <FONT COLOR=3D"#000080" =
SIZE=3D2 FACE=3D"Arial">What happens after a reboot ? =
I</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#000080" SIZE=3D2 FACE=3D"Arial">&#8217;</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT COLOR=3D"#000080" =
SIZE=3D2 FACE=3D"Arial">d guess the auto scsi discovery =
will</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> =
<FONT COLOR=3D"#000080" SIZE=3D2 =
FACE=3D"Arial">&#8220;</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT COLOR=3D"#000080" SIZE=3D2 =
FACE=3D"Arial">destroy</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT COLOR=3D"#000080" SIZE=3D2 =
FACE=3D"Arial">&#8221;</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT COLOR=3D"#000080" SIZE=3D2 FACE=3D"Arial"> the scsi =
mo</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#000080" SIZE=3D2 FACE=3D"Arial">ve results =
?</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT COLOR=3D"#1F497D" =
FACE=3D"Calibri">Regards,</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> </SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#1F497D">&nbsp;</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B></B></SPAN><B><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#1F497D" SIZE=3D2 FACE=3D"Calibri">st.</FONT></SPAN></B><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#1F497D">&nbsp;</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B></B></SPAN><B><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#1F497D" SIZE=3D2 FACE=3D"Calibri">Steffen =
Thuemmel</FONT></SPAN></B><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> </SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#1F497D">&nbsp;</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B></B></SPAN><B><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#1F497D" SIZE=3D1 FACE=3D"Tahoma">ONStor =
GmbH</FONT></SPAN></B><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#1F497D">&nbsp;</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B></B></SPAN><B><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#1F497D" SIZE=3D1 FACE=3D"Tahoma">telf.</FONT></SPAN></B><SPAN =
LANG=3D"en-us"><B></B></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><B><SPAN =
LANG=3D"en-us"><FONT COLOR=3D"#1F497D" =
SIZE=3D2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT COLOR=3D"#1F497D" =
SIZE=3D2 FACE=3D"Tahoma"></FONT></SPAN></B><SPAN =
LANG=3D"en-us"><B></B></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><B><SPAN =
LANG=3D"en-us"> <FONT COLOR=3D"#1F497D" SIZE=3D1 FACE=3D"Tahoma">+49 =
6102 884 84-0</FONT></SPAN></B><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B></B></SPAN><B><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#1F497D" SIZE=3D1 FACE=3D"Tahoma">mobil. =
&nbsp;&nbsp;&nbsp;</FONT></SPAN></B><SPAN =
LANG=3D"en-us"><B></B></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><B><SPAN =
LANG=3D"en-us"> <FONT COLOR=3D"#1F497D" SIZE=3D1 FACE=3D"Tahoma">+49 173 =
673 3434</FONT></SPAN></B><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B></B></SPAN><B><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#1F497D" SIZE=3D1 =
FACE=3D"Tahoma">mail.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></SPAN></=
B><SPAN LANG=3D"en-us"> </SPAN><A =
HREF=3D"mailto:steffen.thuemmel@onstor.com"><SPAN =
LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><U></U></B></SPAN><B><U><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#0000FF" SIZE=3D1 =
FACE=3D"Tahoma">steffen.thuemmel@onstor.com</FONT></SPAN></U></B><SPAN =
LANG=3D"en-us"></SPAN></A><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>
<UL DIR=3DLTR><UL DIR=3DLTR>
<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D2 =
FACE=3D"Tahoma">_____________________________________________<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">From:</FONT></B></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Tahoma"> Sandrine Boulanger<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">Sent:</FONT></B></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Tahoma"> Mittwoch, 15. August 2007 =
01:23<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">To:</FONT></B></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Tahoma"> Rich LaReau; =
dl-cstech<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">Subject:</FONT></B></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Tahoma"> RE: FC path recovery</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D2 =
FACE=3D"Tahoma">_____________________________________________<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">From:</FONT></B></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Tahoma"> Rich LaReau<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">Sent:</FONT></B></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Tahoma"> Tuesday, August 14, 2007 =
4:15 PM<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">To:</FONT></B></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Tahoma"> dl-cstech<BR>
</FONT></SPAN><SPAN LANG=3D"en-us"><B></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">Subject:</FONT></B></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Tahoma"> FC path recovery</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">I =
understand that as a filer discovers luns, it will alternate which FC =
path to take on a per-storage array basis.&nbsp; So normally we expect =
half the luns to be on each of the two FC =
ports.&nbsp;</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"> </SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT COLOR=3D"#000080" SIZE=3D2 =
FACE=3D"Arial">&gt; we should see the paths from both FC ports. If you =
do a scsi show detail on a device, it should show 2 =
paths</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D2 FACE=3D"Arial">Now if we lose one path, all the luns move to =
the surviving port.&nbsp; What happens when the second path is =
restored?&nbsp;</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"> </SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT COLOR=3D"#000080" SIZE=3D2 =
FACE=3D"Arial">&gt; it depends how &#8220;scsi failback&#8221; is set. =
If enable,&nbsp; the original path will be used when it&#8217;s =
restored.</FONT></SPAN></P>
<BR>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D2 FACE=3D"Arial">Do they split up again on their own?&nbsp; Can I =
move them back manually</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT COLOR=3D"#000080" SIZE=3D2 =
FACE=3D"Arial">?</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">&nbsp; Do I need to offline =
and rediscover everything in order to get my paths =
redistributed?</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
COLOR=3D"#000080" SIZE=3D2 FACE=3D"Arial">&gt; scsi move command can be =
used to move luns manually </FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">Thanks,</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">Rich</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>
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