Re: [storm] iSCSI SAM update: login key
Julian Satran <julian.satran@gmail.com> Sat, 27 March 2010 06:57 UTC
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Date: Sat, 27 Mar 2010 09:57:24 +0300
From: Julian Satran <julian.satran@gmail.com>
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Cc: storm@ietf.org
Subject: Re: [storm] iSCSI SAM update: login key
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I would suggest gen instead of level (level has too much of a value connotation - at least it my part of the world :-)) Julo On 27/03/10 08:52, Black_David@emc.com wrote: > Mallikarjun, > > That makes sense (decouple from PDU structure changes), and suggests that we need a key name that doesn't use "PDUFormat" ... > ... How about iSCSIProtocolLevel ? > > It will be necessary to be conservative in defining new values - the requirement to publish a standards track RFC to define a new value should help with that. > > Thanks, > --David > >> -----Original Message----- >> From: Mallikarjun Chadalapaka [mailto:cbm@chadalapaka.com] >> Sent: Saturday, March 27, 2010 12:28 AM >> To: Black, David; storm@ietf.org >> Subject: RE: [storm] iSCSI SAM update: login key >> >>> This will be an IETF key whose values are assigned by IETF standards action >>> (standards-track RFC); it is not linked to SAM versions (e.g., a new version >>> of SAM is not a prerequisite to assigning the value 3). >> Decoupling this key from SAM numbering space is a good idea. >> >> I also suggest decoupling it from PDU structure changes. Any new iSCSI standards track RFC, whether >> or not it extends/changes PDU format, should be able to claim a number by WG consensus. Reasons for >> claiming a new number could include things like: >> 1) New feature introduction (e.g. new Opcodes, new TMF Codes, new Async codes) >> 2) Major bug fix to the iSCSI protocol that affects end node processing >> 3) Change in semantics to keep up with changing SCSI semantics >> 4) A PDU Format enhancement >> 5) TBD reason by WG consensus >> >> Reasons 1-3 may not have associated PDU format changes, unlike 4. I suggest these should all be >> grounds for the WG to consider assigning a number. >> >> Doing this allows implementations to negotiate a shared milestone at an RFC granularity (if that RFC >> has a number), as opposed to feature-by-feature negotiation (e.g. TaskReporting="FastAbort") with some >> gray areas that we had to resort to so far. >> >> Thanks. >> >> Mallikarjun >> >>> -----Original Message----- >>> From: storm-bounces@ietf.org [mailto:storm-bounces@ietf.org] On Behalf Of >>> Black_David@emc.com >>> Sent: Friday, March 26, 2010 11:48 AM >>> To: storm@ietf.org >>> Cc: Black_David@emc.com >>> Subject: [storm] iSCSI SAM update: login key >>> >>> Based on discussion in the Anaheim meeting, here's the proposal that emerged >>> for the login key to negotiate usage of the new features in the iSCSI SAM >>> update draft (draft-ietf-storm-iscsi-sam-00). >>> >>> Past concerns (that I can recall) about this have been: >>> - Key needs to negotiate iSCSI PDU format/content changes only. >>> - Detecting device support or lack thereof for SCSI features >>> should be handled at the SCSI level (e.g., via SCSI commands). >>> - Using a SAM version number in this iSCSI key is not a good idea. >>> - Would like something that can accommodate future changes. >>> - Changing the key name from what's in the draft may be desired. >>> >>> The proposal that emerged is: >>> >>> The key name will be PDUFormatLevel. It's a numeric (not boolean) key with >>> two defined values: >>> - 1 = Current iSCSI (all four RFCs - 3720, 3980, 4850 and 5048, >>> but no change to required vs. optional features). >>> - 2 = Current iSCSI plus features in update draft. >>> Usage is Leading Only (LO), scope is Session Wide (SW). >>> Default value is 1, result function is Minimum. >>> >>> This will be an IETF key whose values are assigned by IETF standards action >>> (standards-track RFC); it is not linked to SAM versions (e.g., a new version >>> of SAM is not a prerequisite to assigning the value 3). >>> >>> This key also provides a clean way to handle definition of iSCSI version >>> descriptors in SPC-4: >>> - 0960h would remain "iSCSI (no version claimed)" >>> - The range 0961h-097Fh would be defined as 0960h + value >>> of PDUFormatLevel key used by the device. >>> That results in one place (IANA registry) covering both definitions (key& >>> version descriptor). >>> >>> In order to support iSCSI version descriptors, we would ask IANA to put the >>> values of the PDUFormatLevel key into a separate registry with its own URL, >>> and then ask T10 to modify SPC-4. The latter is not an immediate action - I >>> would not anticipate bringing the SPC-4 proposal for that to T10 until after >>> the RFC is published and the IANA registry is created. >>> >>> This was the sense of the room + WebEx in Anaheim. Absence of objection on >>> the list will confirm the above as the approach to be taken (rough consensus >>> of the storm WG). >>> >>> Thanks, >>> --David >>> ---------------------------------------------------- >>> David L. Black, Distinguished Engineer >>> EMC Corporation, 176 South St., Hopkinton, MA 01748 >>> +1 (508) 293-7953 FAX: +1 (508) 293-7786 >>> black_david@emc.com Mobile: +1 (978) 394-7754 >>> ---------------------------------------------------- >>> >>> >>> _______________________________________________ >>> storm mailing list >>> storm@ietf.org >>> https://www.ietf.org/mailman/listinfo/storm > _______________________________________________ > storm mailing list > storm@ietf.org > https://www.ietf.org/mailman/listinfo/storm
- [storm] iSCSI SAM update: login key Black_David
- Re: [storm] iSCSI SAM update: login key Mallikarjun Chadalapaka
- Re: [storm] iSCSI SAM update: login key Black_David
- Re: [storm] iSCSI SAM update: login key Julian Satran
- Re: [storm] iSCSI SAM update: login key Mallikarjun Chadalapaka
- Re: [storm] iSCSI SAM update: login key Black_David
- Re: [storm] iSCSI SAM update: login key Julian Satran
- Re: [storm] iSCSI SAM update: login key Mallikarjun Chadalapaka
- Re: [storm] iSCSI SAM update: login key Mallikarjun Chadalapaka
- Re: [storm] iSCSI SAM update: login key Black_David
- Re: [storm] iSCSI SAM update: login key David Harrington
- Re: [storm] iSCSI SAM update: login key Black_David