Each logical unit is independent and is allowed to be different. Examples: In a RAID controller, the direct-access block device type logical units (i.e., logical drives) are probably all the same, but storage array controller and enclosure service type logical units might be more limited. In a tape library, sequential-access device type logical units (i.e., tape drives) might differ from a media changer logical unit.
Although the SCSI transport protocol might currently mandate everything and leave no options, that might change in the next version of the SCSI transport protocol. > -----Original Message----- > From: [email protected] [mailto:linux-scsi- > [email protected]] On Behalf Of Jeremy Linton > Sent: Thursday, 14 February, 2013 2:57 PM > To: Michael Christie > Cc: Hannes Reinecke; Linux Scsi; Elliott, Robert (Server Storage) > Subject: Re: [PATCH] Use a more selective error recovery strategy based on > device capabilities > > On 2/13/2013 8:43 PM, Michael Christie wrote: > > For the case where report supported TMFs is not supported can we just have > the LLD return some new return code from the eh callback when it gets > FUNCTION_REJECTED. scsi-ml would then clear the eh_*_ok bit, so at least it > would not be called again.. > > > Hmm, that seems like a good idea. The question is, does propagating the > flag > change to all the devices on the I_T make sense? > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
