Date: Sat, 22 Nov 2003 22:31:24 +0200 From: "Toomas Aas" <toomas.aas@raad.tartu.ee> To: questions@freebsd.org Subject: (Semi)hot swap IDE Message-ID: <200311222031.hAMKVwm2006917@lv.raad.tartu.ee>
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Hello! I'm looking for a cheap solution to back up a FreeBSD 4.8 machine. Cheap meaning that tape drives are out of question. Even external FireWire drives are deemed a bit too expensive by the folks for whom I'm doing this research. This leaves one option I can think of - standard IDE drive in one of those removable HDD trays. We'd probably use two drives, one being active in the machine and the other being kept somewhere out of the house for safety. The machine has an integrated Promise TX2 controller and two 80 GB drives are currently configured as RAID1 attached to this controller. There are two additional (non-RAID) IDE channels on the motherboard, one of them has CD-ROM attached to it and the other is free - I could attach the backup HD to that. I've done some web searching and I'm getting controversial results. Most of the info I find seems to indicate that IDE devices cannot be hot-swapped. At the same time some vendors are trying to sell stuff on their web pages which they advertise as "hot swap IDE drive bays". I remain skeptical. If the majority is right and IDE drives cannot be hot swapped, this would indicate that we would need to power down the machine every time we want to change the backup HDs. This would be less than perfect, but since we are cheap we could live with it. OTOH I read 'man atacontrol' and saw that there are commands like 'atacontrol detach' and 'atacontrol attach' which seem to be meant for detaching/attaching IDE devices while the machine is running. Does this mean that I could actually run 'atacontrol detach <channel>', swap the drive and then run 'atacontrol attach <channel>' and be able to use the second HD after that? Is anyone doing something like that? -- Toomas Aas | toomas.aas@raad.tartu.ee | http://www.raad.tartu.ee/~toomas/ * I don't know whether to kill myself or go bowling
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