TBT: The Ultimate MPE/iX links big disk, FC
Trail of support leads to indies, or an alt-OS

That final 3000 IO upgrade is still in use

Pass ThroughMore than five years after HP rolled out the ultimate release of MPE/iX, the vendor finished its work on an SCSI Pass-Through driver for the HP 3000. It was an one of the last HP-designed MPE enhancements. Independent support companies have the tech resources to create customized patches for their customers. The HP driver still makes it possible to connect and configure SCSI storage devices which HP has not certified for 3000 use.

Full instructions on how to use the software are on the ManualShelf free website. It's a tool for permitting an application to address SCSI devices without the use of the MPE/iX file system or high-level IO interfaces. But the software itself was built, lab-tested, then placed on the HP software improvements leash: It was only available to the HP support customer who was willing to take SPT, as HP called it, as a beta test version.

Patches MPENX01A, MPENX03A and MPENX04A were beta patches required to make the SPT work on MPE/iX 7.5. HP still makes these patches available to any 3000 customers at no charge. Two years ago, Allegro's Donna Hofmeister said "the magic incantation when dealing with the Response Center folks is to use transfer code 798. That’ll get you to an MPE person." 

Consultants and companies which provide support have many of these patches in their resource bins. The entire patch collection is just 1.27GB, small enough to fit onto a giveaway thumb drive.

HP always described the SPT as a tool with many caveats. While the software has a wide scope of help for the customer who wants to add the latest SCSI disk to the 3000 in the future, HP has printed plenty of cautions such as these in its Communicator article:

Sending SPT commands to a device in use by MPE or other applications may result in data loss, data corruption and/or System Aborts. We do not recommend sending SPT commands to Disks with MPE/iX Volumes present nor should one access tapes devices which are used for normal back-up or data logging purposes. Rule of thumb: Don’t do SPT to tape or disk media you cannot recover at a time you don’t wish to cause a system outage.

In 2007, SPT joined the six dozen or so HP developed enhancements and fixes stalled in beta test status. Customers still purchasing HP support were expected to test enough to get SPT into the full community as a general released patch, but few wanted to use beta-grade software in production.