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Subject: RE: Updated details of lunLabel.doc functional spec.
Date: Thu, 31 Jan 2008 15:16:19 -0800
Message-ID: <BB375AF679D4A34E9CA8DFA650E2B04E08058C56@onstor-exch02.onstor.net>
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Thread-Topic: Updated details of lunLabel.doc functional spec.
Thread-Index: AchfhNs+bCFk6cwHRYCDCvS29UKn3wE2cBOQ
References: <BB375AF679D4A34E9CA8DFA650E2B04E038F8F17@onstor-exch02.onstor.net>
From: "Dave Limato" <dave.limato@onstor.com>
To: "James Kahn" <james.kahn@onstor.com>,
	"dl-Design Review" <dl-designreview@onstor.com>

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The problem I describe below already exists in everon when Migrating
from Raid-1 to Raid-5

1	Are there any cases that will allow re-naming a luns label,=20
	I.E Raid-Type 5 to 6 of existing used luns that are part of a
volume.

2	Also, in which Phase will the Volume Raid-Type Attribute be
updated?

I thought that I heard Tuesday that renaming the Raid Type in a Lun
Label will come later on in Phase 2, 3 or 4. Now that I read the
document I don't see that specified.=20

Without this functionality, Converting existing RAID5 to RAID6 will
become an administrative nightmare. Will certainly drive support calls.
Any Pantera5000 customer that has Raid-5 volumes set for autogrow will
have an admin headache when they convert to Raid-6.

Autogrow looks at the raid-type of the volume when determining which lun
to use when it needs to grow.

Also, if there is a way to identify if LSI mirror volume exists on a lun
(Local or Remote), we should prevent using that lun for normal volume
creates.
Dave


_____________________________________________
From: James Kahn=20
Sent: Friday, January 25, 2008 11:03 AM
To: dl-Design Review
Subject: Updated details of lunLabel.doc functional spec.

All,=20

I've updated the LUN label functional spec. details.
The affected sections are noted in the spec.

Regards,
Jim



/n/software/VolumeManager/lunLabel.doc

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<TITLE>RE: Updated details of lunLabel.doc functional spec.</TITLE>
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<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D2 FACE=3D"Courier New">The problem I describe below already =
exists in everon when Migrating from Raid-1 to Raid-5</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"><FONT =
SIZE=3D2 FACE=3D"Courier New">1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Are =
there any cases that will allow re-naming a luns label, =
</FONT></SPAN></P>

<P DIR=3DLTR><SPAN =
LANG=3D"en-us">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <FONT SIZE=3D2 =
FACE=3D"Courier New">I.E Raid-Type 5 to 6 of existing used luns that are =
part of a volume.</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Courier =
New">2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Also, in which Phase will the =
Volume Raid-Type Attribute be updated?</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Courier New">I =
thought that I heard</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"> <FONT SIZE=3D2 FACE=3D"Courier =
New">Tuesday</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Courier New"> that renaming the =
Raid Type in a Lun Label will come later on in Phase 2, 3 or 4. Now that =
I read the document I don't see that specified. </FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Courier =
New">Without this functionality, Converting existing RAID5 to RAID6 will =
become an administrative nightmare. Will certainly drive support calls. =
Any Pantera5000 customer that has Raid-5 volumes set for autogrow will =
have an admin headache when they convert to Raid-6.</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D2 FACE=3D"Courier New">Autogrow</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Courier New"> looks at the raid-type of the volume when =
determining which lun to use when it needs to grow.</FONT></SPAN><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"Courier =
New">Also, if there is a way to identify if LSI mirror =
volume</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> =
<FONT SIZE=3D2 FACE=3D"Courier New">exists</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Courier New"> on a lun</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Courier New"> (Local or Remote)</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Courier New">, we</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"> <FONT SIZE=3D2 FACE=3D"Courier =
New">should</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Courier New"></FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D2 =
FACE=3D"Courier New">prevent using that lun</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D2 =
FACE=3D"Courier New">for normal volume creates.</FONT></SPAN><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"Courier =
New">Dave</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"></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"> James Kahn<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"> Friday, January 25, 2008 =
11:03 AM<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-Design Review<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"> Updated details of lunLabel.doc functional =
spec.</FONT></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"Arial">All, </FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">I&#8217;ve updated the LUN label functional spec. =
details.</FONT></SPAN></P>

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Arial">The =
affected sections are noted in the spec.</FONT></SPAN></P>

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

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

<P DIR=3DLTR><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Arial">/n/software/VolumeManager/lunLabel.doc</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN><SPAN LANG=3D"en-us"></SPAN></P>

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