A whole hearted +1 John Forte wrote: > I am sponsoring this fasttrack for Jim Dunham. Timeout is set for 01/13/2010. > > - John > > > Template Version: @(#)sac_nextcase 1.68 02/23/09 SMI > This information is Copyright 2010 Sun Microsystems > 1. Introduction > 1.1. Project/Component Working Name: > EOF of iSCSI Target Daemon > 1.2. Name of Document Author/Supplier: > Author: James Dunham > 1.3 Date of This Document: > 06 January, 2010 > > 2. Project Summary > 2.1. Project Description > > This proposal is to remove support for the iSCSI Target Daemon > from Solaris Next and OpenSolaris. This fast-track is for advance > warning that within Solaris Next and OpenSolaris, the iSCSI Target > Daemon, the CLI iscsitadm, the man page iscsitadm(1M), and ZFS's > support for 'shareiscsi' support for ZVOLs will be removed. > > The PSARC cases being deprecated as a result of accepting this proposal > are as follows: > > - PSARC/2007/153 iSCSI target provider > - PSARC/2007/414 SCF changes for iSCSI Target > - PSARC/2006/622 iSCSI/ZFS Integration > - PSARC/2009/168 iSCSI Target PGR directory for ZVOLs > > The iSCSI Target in COMSTAR will replace all of the aforementioned > functionality in Solaris Next and OpenSolaris, with the exception of > ZFS's support for 'shareiscsi'. > > COMSTAR consists of the following PSARC cases: > > - PSARC/2007/523 COMSTAR: Common Multiprotocol SCSI Target > - PSARC/2008/235 SCSI Block Disk Provider for COMSTAR > - PSARC/2008/587 iSCSI Port Provider for COMSTAR > - PSARC/2009/111 COMSTAR Infiniband SRP Target > - PSARC/2008/395 iSER: iSCSI Extensions for RDMA > - PSARC/2008/310 FCoE (Fibre Channel over Ethernet) Target > > 2.2. Risks and Assumptions > > The architectural design of the iSCSI Target Daemon and ZFS's shareiscsi > support, being PSARC/2006/662, is not extensible in its present form, as > the underlying implementation is based on a tight association many iSCSI > Targets, supporting only a LUN 0, for each shareiscsi enabled ZVOL. > > COMSTAR's is a multi-protocol SCSI Target implementation that provides > support for different types of SCSI Targets, not just iSCSI, supporting > LUN numbers up to 16K. ZVOLs are used as backing store devices for SCSI > Initiators using one or more or COMSTAR's support protocols. > > Although the iSCSI Target in COMSTAR is a functional replacement for the > iSCSI Target Daemon, there is no means to provide an automated upgrade > from one form of iSCSI Target to the other. The iSCSI Target Daemon, and > ZFS shareiscsi support, presented a model of many iSCSI Target IDs, with > one iSCSI LUNs per target. The iSCSI Target in COMSTAR presents a model > of limited iSCSI Target IDs, currently 32, and many iSCSI LUNs per > target, up to 16384. A many targets and one LU model, does not map > into a few targets, with many LU model. > > As part of the Solaris Next documentation, a step by step description > of how to upgrade existing iSCSI Target Daemon LUs to iSCSI Target LUs > in COMSTAR will be provided. > > 3. Business Summary > 3.1. Problem Area > > Providing and supporting two different implementations of an iSCSI > Target service is confusing to both system administrators and end users > of Solaris, and also creates an unwanted support burden on Sun, having > to support two totally different implementations of an iSCSI Target. > > The iSCSI Target in COMSTAR, and its use in the Sun Storage 7000 Unified > Storage Server, the iSCSI Target in COMSTAR has proven itself as an > enterprise class iSCSI Target implementation, in features, > functionality, performance and overall stability. This is not the > general consensus with the iSCSI Target Daemon, known to be an inferior > iSCSI Target implementation. > > 3.2. Market/Requester > 3.3. Business Justification > > The iSCSI Target in COMSTAR is built on an enterprise class, Common > Multiprotocol SCSI Target, that in addition to providing support for > iSCSI Targets, it also provides support for iSER, SRP, FC and FCoE SCSI > Targets. > > COMSTAR provides proven block based SCSI Targets support for Solaris > Next, OpenSolaris and the Sun Storage 7000 Unified Storage Systems. > > 3.4. Competitive Analysis > > Sun has a unique position over other storage vendors and operating > systems, in that the iSCSI Target in COMSTAR is Open Source, based on > Open Standards, for ubiquitous access to Open Storage. > > 3.5. Opportunity Window/Exposure > > Solaris Next, OpenSolaris, Sun Storage 7000 Unified Storage Systems > > 3.6. How will you know when you are done? > > Removal of the iSCSI Target in Solaris Next, OpenSolaris, and an > installed based that is using the iSCSI Target in COMSTAR, as a > replacement for the iSCSI Target Daemon. > > 4. Technical Description > > The iSCSI Target Daemon is an inferior implementation when compared to > the iSCSI Target in COMSTAR. The iSCSI Target Daemon, supports only a > single SCSI Target implementation, has been noted by storage-discuss, > RPE and within the Sun Storage 7000 Unified Storage Server as being > underperforming, with known scalability issues when used with Solaris, > and other operating systems supporting iSCSI Initiators. > > A point worth stating is that an iSCSI Target listens for iSCSI > Initiator requests on TCP/IP port 3260. This means that two different > implementations of iSCSI Target can not run at the same time, on > the same Solaris host. > > Therefore, when iSCSI Target in COMSTAR is active on a Solaris host, > ZFS's shareiscsi support no longer works, even though the iSCSI Target > Daemon has yet to be removed. > > All of these issues and more, were eliminated with the design, > development and successful release of the iSCSI Target in COMSTAR. > > 6. Resources and Schedule > 6.4. Steering Committee requested information > 6.4.1. Consolidation C-team Name: > ON > 6.5. ARC review type: FastTrack > 6.6. ARC Exposure: open > >
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