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- From: lupe@ukw.uucp (Lupe Christoph)
- Newsgroups: comp.sys.sun.admin,comp.sys.sun.hardware
- Subject: Re: HELP with 4/490 SCSI Device IDs for SCSI disk drives.
- Message-ID: <1992Aug13.065536.2009@ukw.uucp>
- Date: 13 Aug 92 06:55:36 GMT
- References: <1992Aug12.142412.15112@Princeton.EDU>
- Sender: uucp@stasys.sta.sub.org ()
- Organization: cic
- Lines: 49
-
- stz@phoenix.Princeton.EDU (Stephen Zehl) writes:
-
- >-
-
- > Sun does not recommend putting SCSI disk drives on the SCSI bus of a
- >4/490, but everyone else has told me that there is no problem with doing it.
- >I have been unable to find anything to help me set the SCSI device IDs of the
- >drives. Does anyone have multiple SCSI drives hanging off a 4/490 that could
- >tell me the SCSI device IDs they used and what what drive device that is
- >associated with. for example, here are the settings for a Sparc2s internal
- >drives:
-
- > Drive Number SCSI Device ID Drive Device
- > ------------ -------------- ------------
- > 1 3 sd0
- > 2 1 sd1
-
- There is no such strangeness on a 4/490. But I believe I remember that
- you can still hang two disks off one controller, so target 0 LUN 0 is sd0,
- target 0 LUN 1 is sd1, etc. Better have a look at the GENERIC file.
- You should see target addresses as three digit octal numbers (i.e. the
- first digit is always zero).
-
- The middle digit is the target address, the least significant digit is
- the LUN. If you use embedded SCSI disks, you can use only the 0<n>0
- entries, i.e. the LUN must be zero. The others are there for Emulex
- MD-21 controllers, which is long out of the Sun pricelist. If you've
- never heard of it: it is a SCSI->ESDI controller that supports two
- ESDI drives. It was used with the Sun "shoebox".
-
- > Also, how many drives can I daisy chain off of the SCSI bus, I already
- >have 2 tape drives and a cdrom on it.
-
- The SCSI bus has a target address range of 0..7. The Sun host adapter uses 7.
- Your tapes probably use 4 and 5, and the CD-ROM 6. This leaves you with 0..3
- for disks, which happens to be the standard range Sun uses in the system
- configuration files (like GENERIC).
-
- > Thanks.
-
- >Stephen Zehl
- >Systems Admin. Princeton University Cognitive Science Lab
- >Princeton, NJ
- >sz@clarity.princeton.edu
- --
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-