This message is from the T13 list server.
> -----Original Message----- > From: Nathan Obr [mailto:[EMAIL PROTECTED] > Sent: Friday, April 16, 2004 11:36 AM > To: Elliott, Robert (Server Storage); [EMAIL PROTECTED] > Subject: RE: [t13] FYI: T10 news: SCSI to ATA Translation > Study Group meeting > > > Hi Robert, > > Perhaps you can help me understand the motivation for this work. > Is this new group trying to prevent errors or is it trying to provide > consistency? > If the latter, in what situation is it important for the > translation of SCSI to ATA (and vice versa) to be consistent across > different products? It will help present a consistent look to the OS - to the SCSI class driver and any application generating SCSI CDBs. It will define a base set of SCSI features that software can use across HBAs. For example, they should all support the same set of commands and task management functions. INQUIRY data for the same drive will remain the same (or at least be predictably different) if the HBA is changed. It will probably address multiple-initiator issues, so two HBAs in the same SAS domain are not totally confused when they both find a SATA drive (which doesn't understand multiple hosts). SCSI reservation command translation will be interesting. If an OEM has qualified a SATA disk drives with one HBA running a certain OS, this will help ensure that it also works with other HBAs. If HBAs chose to translate differently (different commands or chose different field values within the same commands commands), it'd be as if the OS changed too. If everyone has a common baseline for testing, interoperability should improve. > As far as I can tell all of the translation is very modular and > should happen transparently to other devices. What device can see > inconsistent translations in such a way that causes problems? > > Thanks, > Nathan > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of > Elliott, Robert (Server Storage) > Sent: Thursday, April 15, 2004 1:50 PM > To: [EMAIL PROTECTED] > Subject: RE: [t13] FYI: T10 news: SCSI to ATA Translation Study Group > meeting > > This message is from the T13 list server. > > > No, it's not trying to improve or replace ATAPI. > > Serial Attached SCSI (SAS) supports both SCSI (SAS) and ATA (SATA) > drives. Most SAS HBAs (and even some SATA HBAs) present a SCSI > interface to the operating system, and translate SCSI to ATA > in their OS > miniport-level driver and/or HBA firmware when talking to the ATA > devices. > > This project is an attempt to standardize that translation so > software, > HBA vendors, and drive vendors can predict what's going to happen. It > will probably end up as a technical report, not a > full-fledged standard. > > It will cover things like: > * Basic SCSI reads and writes -> ATA reads and writes > * SCSI INQUIRY command - an ATA IDENTIFY DEVICE or IDENTIFY PACKET > DEVICE is probably generated, but there are substantial differences in > the data they return. A SCSI INQUIRY VPD page might be defined to > return the raw IDENTIFY DEVICE contents. > * Mode pages - the Write Cache Enable bit in the SCSI Caching > mode page > needs to control the ATA drive write cache, for example. > * Translating errors - build reasonable SCSI sense data from the ATA > task file results > * SCSI to ATAPI - if the ATA device is really ATAPI, then the SCSI > command can be embedded in an ATA PACKET command > > -- > Rob Elliott, [EMAIL PROTECTED] > Hewlett-Packard Industry Standard Server Storage Advanced Technology > https://ecardfile.com/id/RobElliott > > > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > > Behalf Of [EMAIL PROTECTED] > > Sent: Thursday, April 15, 2004 12:57 PM > > To: [EMAIL PROTECTED] > > Subject: [t13] FYI: T10 news: SCSI to ATA Translation Study > > Group meeting > > > > > > This message is from the T13 list server. > > > > > > This just in. Is T10 attempting to re-invent ATAPI ? > > I don't know any details, so don't ask me, but thought it > > worth sharing on > > the T13 reflector. > > - Jim Hatfield > > ============================ > > |---------+----------------------------> > > | | John Lohmeyer | > > | | <[EMAIL PROTECTED]| > > | | > | > > | | Sent by: | > > | | [EMAIL PROTECTED]| > > | | No Phone Info | > > | | Available | > > | | | > > | | 04/15/2004 10:50 | > > | | AM | > > | | | > > |---------+----------------------------> > > > > >------------------------------------------------------------- > > -------------------------------------------------| > > | > > | > > | To: T10 Reflector <[EMAIL PROTECTED]> > > | > > | cc: > > | > > | Subject: SCSI to ATA Translation Study Group > > meeting | > > > > >------------------------------------------------------------- > > -------------------------------------------------| > > > > > > > > * From the T10 Reflector ([EMAIL PROTECTED]), posted by: > > * John Lohmeyer <[EMAIL PROTECTED]> > > * > > A new study group has formed to examine the idea of > > developing a standard > > or technical report on translating SCSI commands to ATA > > devices. The group > > will meet Tuesday morning May 4th in Monterey, CA. Steve Johnson > > <[EMAIL PROTECTED]> has agreed to lead this meeting. Meeting > > information is > > available at: > > > http://www.t10.org/meeting.htm > > Anyone interested in this topic is welcome to participate. Hotel space > is > limited, so make your room reservations now. > > > > -- > John Lohmeyer Email: [EMAIL PROTECTED] > LSI Logic Corp. Voice: +1-719-533-7560 > 4420 ArrowsWest Dr. > Colo Spgs, CO 80907 > > * > * For T10 Reflector information, send a message with > * 'info t10' (no quotes) in the message body to [EMAIL PROTECTED] > > > > > >
