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SCO Unix, Xenix and ODT General FAQ

This article is from a FAQ concerning SCO operating systems. While some of the information may be applicable to any OS, or any Unix or Linux OS, it may be specific to SCO Xenix, Open This is an old article about HP Tape drives on SCO Unix and is only left here for historical purposes. There is lots of Linux, Mac OS X and general Unix info elsewhere on this site: Search this site is the best way to find anything.

Why does my Compaq with an HP tape give "NOTICE: cha: SCSI bus has been reset ha=0 " messages on SCO Unix?

Compaq controllers with HP tape drives may see

 NOTICE: cha: SCSI bus has been reset  ha=0 
 Attached SCSI peripherals will return to power up state 
 NOTICE: cha: Unexpected SCSI phase  ha=0 id=6 lun=0 

This is harmless but annoying. To fix:

 1. cd /etc/conf/pack.d/cha
 2. vi space.c
 3. Search for "int cha_print_warnings= -1;"
 4. Change it to "int cha_print_warnings=0;"
 5. Relink the kernel and reboot for the change to take effect

My memory of this is that it happens every time the drive is accessed. I've never been able to convince a customer to just "ignore it" though..

My feeling is to silence it. If the drive fails, you either know it because it failed completely or you start getting flaky verification errors. If it supports TapeTell then you can get more info from that anyway.

List of other SCSI error codes

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