I don't think, however, that the SCA connector implements power. So ... you still have to connect power ahead of the bus. --Mitch -----Original Message----- From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Brandon, Tom Sent: Tuesday, February 13, 2001 7:24 PM To: PICLIST@MITVMA.MIT.EDU Subject: Re: [OT]: PICList.com up after Hard Drive reformat You might like to have a chat with Adaptec about that:
Q: Does the AHA-3950U2 support hot swap of SCSI devices? A: No, not for devices directly connected on the SCSI cable. Hot swap is a function of the device enclosure. Specific enclosure design is required to ensure that power is removed from the SCSI device and the device isolated from the bus before it is removed. Power surges or bus lockup will occur if a device connected directly to a cable is removed or connected while the system is functional.
The "Hot swappable" drives I was referring to are SCA drives. SCA refers to Single Connector Attach. From what I can tell, SCA means that the last device on the bus will automatically terminate. Sorry, I'd had SCA described as hot swappable by our supplier when they're not quite the same. Tom. -----Original Message----- From: David VanHorn [mailto:dvanhorn@CEDAR.NET] Sent: Wednesday, February 14, 2001 11:47 AM To: PICLIST@MITVMA.MIT.EDU Subject: Re: [OT]: PICList.com up after Hard Drive reformat At 11:53 AM 2/14/01 +1100, Brandon, Tom wrote: >To be replaceable without a shutdown you need a RAID\SCSI card that's >supports Hot swap (I think only RAID and REAL expensive SCSI would support >this), drives that support Hot swap and drive bays for hot swap. Here in >Australia, it was about AU$20 extra on an 18.2Gb SCSI to get Hot swap but >the drive bays were about AU$250 (about 1\2 the price of the drives but >SCSI's quite expensive here) each so overall it was quite expensive. All scsi devices and cards are hot-swap. SCSI is natively hot-swap. There are caveats, like you have to be running raid, or make sure the drive is dismounted. -- Dave's Engineering Page: http://www.dvanhorn.org Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.