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    RE: iSCSI: Aggregation tags in SendTargets



    I think you meant to ask
     
    ***    Anyone need Alpha-Numeric Aggregation Tags    ***
                       ^^^^^
                       Going once....
    
    I have no strong opinion either.  Alpha's a little more user-friendly, but
    that is not important enough in this feature to warrant any argument, so if
    implementors want numeric tags, let them be numeric...
    
    Marj 
    
    > -----Original Message-----
    > From: Mark Bakke [mailto:mbakke@cisco.com]
    > Sent: Wednesday, May 16, 2001 9:13 AM
    > To: Kevin Gibbons
    > Cc: IPS; Marjorie Krueger
    > Subject: Re: iSCSI: Aggregation tags in SendTargets
    > 
    > 
    > Kevin-
    > 
    > I think that a numeric tag would be simpler as you had said.
    > Marjorie had asked for the alpha-numeric tag; anyone needing
    > more than a numeric tag, please speak up.  I don't have any
    > particular opinion either way.
    > 
    > If nobody requires alpha-numeric tags, I will change it to
    > a simple numeric tag.  Otherwise, I'll update the examples.
    > 
    > So,
    > 
    >    ***    Anyone need Numeric Aggregation Tags    ***
    > 
    >                    Going once....
    > 
    > --
    > Mark
    > 
    > Kevin Gibbons wrote:
    > > 
    > > Mark,
    > >         in the proposed change to the NDT document, you 
    > state that the
    > > aggregation "tag" is an ASCII, alpha-numeric string.  I 
    > read this to mean
    > > the tag can be any string value.
    > > 
    > >         Could you make the aggregation tag be a numeric 
    > string, indicating
    > > an aggregation group?  This would align with your example, 
    > and should make
    > > it easier to quickly index portals into different groups.
    > > 
    > >         Regards, Kevin
    > > 
    > > -----Original Message-----
    > > From: Mark Bakke [mailto:mbakke@cisco.com]
    > > Sent: Tuesday, May 15, 2001 1:06 PM
    > > To: IPS
    > > Subject: iSCSI: Aggregation tags in SendTargets
    > > 
    > > During the interim meeting, we had discussed a proposal to
    > > add an aggregation tag to the SendTargets response, indicating
    > > which (if any) target addresses supported multiple connections
    > > per session, and which groups of addresses an initiator could
    > > hope to aggregate a session across.
    > > 
    > > Aggregation tags were generally well-received; a small modification
    > > to the proposed method also allows an initiator to know whether
    > > a single address supports multiple connections per session just
    > > by itself.
    > > 
    > > Here is the section that would go into the NDT document.
    > > 
    > > --
    > > 
    > > (This would be added to section 4.2, right before the 
    > vendor-specific
    > > paragraph at the end):
    > > 
    > >   If an iSCSI target supports multiple connections per session,
    > >   it must indicate this by including an aggregation tag after each
    > >   address, in the form of
    > > 
    > >     TargetAddress=address,tag
    > > 
    > >   Where "tag" is an ASCII, alpha-numeric string indicating 
    > an address
    > >   group.  Within a single session, a connection may be 
    > requested to any
    > >   combination of TCP addresses that have the same tag.  If 
    > an address
    > >   supports multiple connections per session, but does not support
    > >   spanning a session across other addresses, it will have its own
    > >   tag.
    > > 
    > >   Here is an example:
    > > 
    > >     TargetName=fqn.com.acme.diskarray.sn.8675309
    > >     TargetAddress=10.1.0.45:3000,1
    > >     TargetAddress=10.1.1.46:3000,1
    > >     TargetAddress=10.1.0.47:3000,2
    > >     TargetAddress=10.1.1.48:3000,2
    > >     TargetAddress=10.1.1.49:3000
    > >     TargetAddress=10.1.1.50:3000,3
    > >     TargetAlias=Oracle tables
    > > 
    > >   In this example, any of the target addresses can be used to reach
    > >   the same target.  A single-connection session can be established
    > >   to any of these TCP addresses.  A multiple-connection 
    > session could span
    > >   addresses .45 and .46, or .47 and .48, but cannot span any other
    > >   combination.  A TargetAddress without a tag (.49) cannot 
    > be combined
    > >   with any other address within the same session.  A TargetAddress
    > >   with a tag that is not shared with other addresses 
    > supports multiple
    > >   connections per session, but all connections must be to the same
    > >   address.
    > > 
    > >   To make this work, there are a few rules to follow:
    > > 
    > >   A target that does not support spanning sessions across 
    > multiple addresses
    > >   MUST NOT include the tags.
    > > 
    > >   A target that is accessible via multiple TCP addresses 
    > SHOULD include
    > >   all TCP addresses in a SendTargets response.
    > > 
    > >   A target with multiple TCP addresses that supports a 
    > session spanning
    > >   multiple TCP addresses MUST indicate TCP address groups 
    > using aggregation
    > >   tages in a SendTargets response.
    > > 
    > >   Aggregation tags have no meaning or persistence beyond a 
    > particular
    > >   SendTargets response.
    > > 
    > > --
    > > Mark A. Bakke
    > > Cisco Systems
    > > mbakke@cisco.com
    > > 763.398.1054
     
    


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Last updated: Tue Sep 04 01:04:41 2001
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