On Fri, Sep 10, 2004 at 12:00:08PM +0100, Paul Furness wrote: > > Hmmm. It looks like it's taking its time detecting the SCSI devices. All Detection of SCSI devices can take a long time, a very long time. Absent devices are discovered with a timeout that can be VERY long. This may be one of the cases where you want to disable hardware rediscovery in the normal boot sequence once a full discovery had taken place. I cannot recall the timeout but I recall marveling how long it can be. IIRC, One component of the SCSI timeout being long was the time it takes for a SCSI tape device to power on, rewind and reply to a command. Many SCSI systems are set up to power each device in sequence since +75% of the power requirements are only applicable during spin-up/ power-on. Instant power-up (jumper option) can require an overly expensive PS. If you have a handful of devices it can be fun to set the ID of each to span the full range of possible devices so you can see blinking lights sequence at regular intervals. i.e. 1,2,3,4 .vs. 1,4,8,16. Also for fun, you might watch a 1,3,4,5... sequence and time the gap that 2 produces. Bottom line is that devices that are healthy will be quick. It is the empty holes that take time. -- T o m M i t c h e l l In the USA, be informed, Vote Nov 2004.
