Re: Hot plugging of SATA disks doesn't seem to work under NetBSD-4.x?

[jnemeth%victoria.tc.ca@localhost (John Nemeth)]

On Sep 4,  8:35am, Brian Buhrow wrote:
}
}       Hello.  I have several Sunfire X2200 boxes with SATA disks attached.
} They probe as follows:
} 
} viaide1 port 0: device present, speed: 3.0Gb/s
} viaide1 port 1: device present, speed: 3.0Gb/s
} wd0 at atabus1 drive 0: <ST3320620AS>
} wd0: quirks 2<FORCE_LBA48>
} wd0: drive supports 16-sector PIO transfers, LBA48 addressing
} wd0: 298 GB, 620181 cyl, 16 head, 63 sec, 512 bytes/sect x 625142448
} sectors
} wd0: 32-bit data port
} wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
} wd0(viaide1:0:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) (using
} DMA)
} wd1 at atabus2 drive 0: <ST3320620AS>
} wd1: quirks 2<FORCE_LBA48>
} wd1: drive supports 16-sector PIO transfers, LBA48 addressing
} wd1: 298 GB, 620181 cyl, 16 head, 63 sec, 512 bytes/sect x 625142448
} sectors
} wd1: 32-bit data port
} wd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
} wd1(viaide1:1:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) (using
} DMA)
}               All works well until one of the drives is reset, either because
} it was pulled out and reinserted, or until it was pulled out and another
} drive installed.  At that point, timeouts for that drive ensue, and drive
} resets fail.
} 
}       My questions are:
} 
} 1.  Are SATA drives supposed to be hot pluggable from a software
} perspective, as SCSI disks are?

     In general SCSI disks aren't hot pluggable unless they're hanging
off a hot pluggable bus such as Cardbus or PCMCIA (or inside a RAID
enclosure where the RAID controllers deals with drives coming and
going).

     Note that in general, hot plugging SCSI devices can do bad
things.  You should only do it if they are in an enclosure designed for
hot plugging.

     SATA drives aren't currently hot pluggable.

} 2.  If not, has anyone looked at what changes are required to make this
} functionality work?
} 
} 3.  If not, can anyone provide direction on what I should pay attention to
} if I want to help make that functionality work?

     Unfortunately, I don't know the answer to these two questions.

}-- End of excerpt from Brian Buhrow