SAS transport class status?

Luben, et. al.

Any updates on the SAS transport class code? Are we likely to see this happening in the 2.6.14 time frame? After the BOF at OLS, I figured we would be moving quick on this...

Eric, have you tried to get your code ported to Luben's patch?

Thanks,

-tduffy

It really depends on when 2.6.14 is coming out.
I'm doing discovery at the moment.

Luben

Luben, are you also working on the PHY transport class James mentions in his OLS paper, or have you been focusing just on the SAS transport class?

Thanks

Brian

Brian King
eServer Storage I/O
IBM Linux Technology Center

SAS layer. It sits between a SAS LLDD and SCSI Core, and it manages phy events, ports and port events, domain discovery, device registration and unregistration with SCSI Core, etc. Devices are registered with their respective managing layers: SSP port devices with SCSI Core, STP and directly attached SATA, and SATA Port multiplier (ports) with libata. SMP ports are driven by the SAS layer (since SMP is strictly a SAS proto).

SAS LLDDs do phy management, OOB, and report phy, port, and HA events to the SAS layer. SAS LLDDs do not do port management or discovery or device management (they are just a "transport").

Attributes of all and any entities managed by the SAS layer and their relationships are portrayed in sysfs in true manner. They themselves depict the physical world as seen by the SAS host adapter.

Reference of the internal infrastucture:
SAS 1.1, chapter 4.

Architecture reference:
SAM4r02, chapter 1.3, Figure 2 (same as in SPC), where "Device specific commands" is SCSI ULDD (sd, st, etc),

"Shared Command Set"       is SCSI Core,
"SCSI Protocols"           is the SAS layer for SAS HAs,
"Interconnects"            is the SCSI LLDD (aic94xx, etc).

Luben