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- Newsgroups: comp.unix.sysv386
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!destroyer!mudos!mju
- From: mju@mudos.ann-arbor.mi.us (Marc Unangst)
- Subject: Re: Primary SCSI, secondary athd on ISC Unix 3.0 possible?
- Message-ID: <BtGpvF.9tv@mudos.ann-arbor.mi.us>
- Date: Mon, 24 Aug 1992 00:40:26 GMT
- References: <1992Aug21.180336.6922@grebyn.com>
- Organization: The Programmer's Pit Stop, Ann Arbor MI
- Lines: 27
-
- In article <1992Aug21.180336.6922@grebyn.com> richk@grebyn.com (Richard Krehbiel) writes:
- >permits this configuration? Is there an insurmountable obstacle that
- >prohibits this configuration? Thanks in advance.
-
- This is probably a hopeless task. The reason is that the Adaptec
- 1542B does not operate through the AT BIOS hard drive calls; instead,
- it has its own add-on BIOS that chains off the AT BIOS. Because of
- the way this is designed, if you have a WD1003-compatible hard disk in
- your system (be it ST-506, ESDI, or IDE), that drive MUST be the
- primary drive, and your SCSI disk MUST be the secondary. There is no
- way around this. Since the BIOS will only boot from the active
- partition on the primary drive, you will have to boot from the ESDI
- drive.
-
- Depending on how the ISC boot program works, though, you might be able
- to get around it. You will have to be able to specify alternate root,
- swap, and pipe filesystems to the boot(8) program. If you can do
- this, then you could boot from the ESDI drive but have your root and
- swap filesystems on your existing SCSI drive. Depending on which
- files ISC needs to boot, you may need to put a "skeleton" root
- filesystem on your SCSI drive. (SVR4 does not have this problem,
- since everything it needs to boot is on the /stand filesystem.)
-
- --
- Marc Unangst | Real men don't make backups. Real men never
- mju@mudos.ann-arbor.mi.us | accidentally delete files that they're going
- | to need later.
-