Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!elroy.jpl.nasa.gov!decwrl!ogicse!cvedc!mcspdx!adphdw20!dtb From: dtb@adpplz.UUCP (Tom Beach) Newsgroups: comp.periphs.scsi Subject: Re: WARM SWAP Summary: Another .02$ worth Message-ID: <693@adphdw20.UUCP> Date: 25 Apr 91 16:05:24 GMT References: <1991Apr24.003217.12018@wpi.WPI.EDU> Organization: ADP Dealer Services R&D, Portland, OR Lines: 32 Another point which hasn't been mentioned is that many systems do an autoconfig when powered up and any device that isn't on the bus at power on isn't EVER on the bus, whether you add it physically on not. In my testing I frequently swap devices with the SCSI powered. My devices under test are external to the host with separate power supplies and on a second SCSI bus. I power them down, swap devices, power them back up. Do a dummy access to clear the ERROR: Device has been reset! messages, and continue the test. Except for the rare bus power fuse failure, this works great but on many systems You Can't: 1) Add new devices! 2) Change device categories, e.g. replace a disk with a tape! As I said, just my two cents! Tom ------------------------------------------------------------------------ | Tom Beach : Sr Project Engineer : Mass Storage Technology | | phone : (503) 294-1541 | | email : uunet : dtb@adpplz.uucp | | ADP Dealer Services, ADP Plaza, 2525 S.W. 1st Ave, Portland OR, 97201 | ------------------------------------------------------------------------