So I have discovered that the problem lies somewhere between my PSU and the LTO4 tape drives. The PSU An Antec 80 Plus gold rated 1000W supply. At peak power draw (on boot) the server draws 650 -ish Watts, during operation no more than 250W, so the power supply is not under heavy load. All of the voltages on each rail measure within 0.15V of the rated voltage. So when I start to write to the LTO4 drive, it appears it is re-setting itself due to a power problem? this happens on both drives as I said before. Recap: The drive writes for a few seconds. Goes 'donk' then the orange LEDs light up and the drive reboots. At this point I have to reboot the server (probably because SCSI is not hot-swappable). So I connected an external PSU only to the LTO4 drives (one at a time) while they are still connected to the server via SCSI and they seems to work fine. So I have spent hours swapping leads / cleaning connections / measuring resistance on my PSU and all its cables but I cannot see anything obviously wrong. I even disconnected every item of hardware apart from the LTO4 drive and an ubuntu live USB. The problem still occurs. So I temporarily installed a lower power PSU into the server (because all of the hard drives and other tape drives are connected). And repeated the test with the ubuntu live usb. And the drives work fine. so the remaining puzzle is: why won't the LTO 4 drives work with my expensive Antec Server PSU but they do work with a £7.50 cheapo unbranded chinese supply? And also why do all my other tape drives work fine with the Antec PSU? Is it a problem with the model (HP 1760 SCSI)? But they work fine on another PSU so the LTO4 drives cannot be at fault can they? Anyone have a clue how to proceed? -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org