External SCSI Hot Swap

NeXT Computer, Inc. -> NeXT Black Hardware

Title: External SCSI Hot Swap
Post by: CygnusTM on June 27, 2023, 07:16:37 AM
Google has failed me in an attempt to answer this question. Is it safe to hot swap external SCSI devices on NeXT hardware? That is, plug and unplug devices while the computer is running. I'd like to do this with a BlueSCSI. Thanks.
Title: Re: External SCSI Hot Swap
Post by: user341 on June 27, 2023, 02:04:13 PM
I think it is dangerous because SCSI requires termination, so yanking something will mess up the termination on a live line.

But that's just going off memory, I could be wrong. Interested to see what others say.
Title: Re: External SCSI Hot Swap
Post by: nuss on June 27, 2023, 03:59:53 PM
Please never plug or unplug SCSI devices on running hardware.
Title: Re: External SCSI Hot Swap
Post by: MindWalker on June 28, 2023, 06:25:04 AM
In case of BlueSCSI, taking off the SD card and changing the drive config there and putting it back in (without physically detaching the BlueSCSI itself or touching the term jumpers), I'd expect that to be electrically safe (as the bus itself remains intact)?

Although I am not sure if BlueSCSI even officially supports hot-plugging the SD card.
Title: Re: External SCSI Hot Swap
Post by: CygnusTM on June 28, 2023, 07:51:21 AM
Of course. Termination. I should have known it was a bad idea. Thanks, everyone!
Title: Re: External SCSI Hot Swap
Post by: Apple2guy on June 29, 2023, 02:55:58 AM
Trust me I had a drive die while running nextstep it wasn't the boot drive but the system still crashes.

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