Messages in this thread | | | Date | Fri, 20 Jun 1997 13:13:00 -0400 (EDT) | From | Gerald Britton <> | Subject | Re: rescan scsi |
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On Fri, 20 Jun 1997, docwhat@gerf.org ;The Doctor What wrote:
> I have a question....why do people say NOT to add scsi devices on the > fly to a system? I thought that was (inpart) the point of SCSI? > > The only things I can think of is: > 1) The device generates a "startup" message that does evil things to > the SCSI card. (Which doesn't make sense, since I always turn off > external scsi devices if I'm not using them for an extended period of time). > 2) There is a chance of an electrical discharge that frys hardware....
#2 is the reason why people say not to hotadd stuff... this in general goes for any componant.. including parallel ports etc.. i've never run into a problem with this before. There are HotSwap scsi busses which have trays with connectos to provide safe insertion into a running system.. i've hot inserted devices into this type of system with no problem. I have also inserted devices into non-hotswap systems without problem. one thing you might run into hot swapping scsi is termination.. you'll need to remove the terminator to add a new device.. do this quickly, as the scsi device will likely give errors during this period.. it _usually_ won't be a problem, but it might be.
> 3) You might accidentally be sucked into the computer and be forced to > play silly 80's games involving frisbees and glowing cycles. > > Of course, I work for Tandem and we ALWAYS hot-swap stuff (except for > $SYSTEM, aka the /root partition ;), and only a few operators have > become victims of the MCP. > > (Holy Tron references, Batman!) > -- > The Doctor What: Guru of the Gods http://www.gerf.org/~docwhat/ > docwhat@gerf.org (finger docwhat@gerf.org for PGP key) > PGPkey Fingerprint: EA 4C 8C FC 5C F0 14 78 9C 02 B9 A1 83 54 7C 8D >
-- Gerald Britton gbritton@nih.gov
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