Keeping storage devices fresh is a key step in maintaining a datacenter that uses HP's 3000 hardware. Newer 3000s give you more options. Our net.digest columnist John Burke shared advice that's still good today while planning the future for a 3000s that will remain online for some time to come. Maybe not until 2028, but for awhile.
If you can, replace your older machines with the A-Class or N-Class models. Yes, the A-Class and some N-Class systems suffer from CPU throttling. (That's HP’s term. Some outside HP prefer CPU crippling.) However, even with the CPU throttling, most users will see significant improvement simply by moving to the A-Class or N-Class.
Both the A-Class and N-Class systems use the PCI bus. PCI cards are available for the A- and N-Class for SE-SCSI, FW-SCSI and Ultra-3 SCSI (LVD). You can slap in many a drive manufactured today, made by any vendor. SCSI is SCSI. Furthermore, with MPE/iX 7.5, PCI fiber channel adaptors are also supported, further expanding your choices.
If you are going to homestead on the older systems, or expect to use the older systems for a number of years to come, you have several options for storage solutions. For your SE-SCSI adaptors, you can use the new technology-old interface 18Gb and 36Gb Seagate drives. For your FW-SCSI (HVD) adaptors, since no one makes HVD drives anymore, you have to use a conversion solution. [You could of course replace your FW-SCSI adaptors with SE-SCSI adaptors, but this would reduce capacity and throughput.]
One possibility is to use an LVD-HVD converter and hang a string of new LVD drives off each of your FW-SCSI adaptors. HP and other vendors have sold routers that allow you to connect from FW-SCSI adaptors to Fibre Channel resources such as SANs. It's one way to accomplish something essential: get rid of those dusty old HP 6000 enclosures, disasters just waiting to happen.
As for tape drives, move away from DDS and use DLT (4000/7000/8000) with DLT IV tapes. Whatever connectivity problems there are can be dealt with just like the disk drives. If you have an A-Class or N-Class machine, LTO or SuperDLT both use LVD connections. If you have a non-PCI machine, anything faster that a DLT 8000 is wasted anyway because of the architecture lineups with 3000 IO.