dre@umn-cs.CS.UMN.EDU (Douglas R. East) (04/27/89)
I'm fairly new to a Sun environment and I need a little help configuring the disk subsystems of a Sun 3/60. In particular, I have the following questions: 1. Can more than two shoeboxes be placed on the SCSI port? According to the Mass Storage Systems manual, only two can be--a unit with the 1/4" tape plus an add-on unit. But this doesn't make a lot of sense to me, after all, what is SCSI for? I would like to place a third 70M shoebox since I happen to have one laying around. 2. If more than two can be on the bus, how do you set the target and unit inside the shoebox. I can't find anything in the documentation I have that shows how to set up the jumpers. The two shoeboxes currently on the 3/60 are targets 0 and 1, both units 0 (this corresponds to drives 0 and 8). The extra shoebox is configured as target 1, unit 0 (drive 8). I would like to configure it as target 0, unit 1 (drive 1). 3. If 2. is possible, does the last shoebox (presumably target 0, unit 0) need to be terminated in any way? I appreciate any help regarding this manner. Thanks in advance, Doug East ARPA: dre@umn-cs.cs.umn.edu Phone: (612) 625-5856
neil@uunet.uu.net (Neil Gorsuch) (05/06/89)
In article <12012@umn-cs.CS.UMN.EDU> dre@umn-cs.CS.UMN.EDU (Douglas R. East) writes: >1. Can more than two shoeboxes be placed on the SCSI port? ... >2. If more than two can be on the bus, how do you set the target and unit >inside the shoebox? ... Sunos allows 4 SCSI addresses to be used for disks. On certain models, such as 3/50's and 3/60's, you can put up to 2 disks per SCSI address. These are usually ST506 drives that are interfaced to SCSI via an Adaptec board, or ESDI drives that are interfaced to SCSI via an Emulex MD21 board. To see how many SCSI disks can be can be used, look at file /usr/sys/sun3/OBJ/sd.h, this will tell you how many static sd structures are allocated in the kernel. Sun 3's allow 4 disks in Sunos 4.0 or later, and I seem to recall only 2 allowed in earlier versions of SUnos. For the Sun models that support ESDI and ST506 drives, this is the correspondance between device names and SCSI addresses: device scsi lun kernel specification line name address to include this drive sd0 0 0 disk sd0 at si0 drive 0 flags 0 sd1 0 1 disk sd1 at si0 drive 1 flags 0 sd2 1 0 disk sd2 at si0 drive 8 flags 0 sd3 1 1 disk sd3 at si0 drive 9 flags 0 (The previous 4 lines come from the GENERIC kernel, which allows up to 2 SCSI drives, or up to 4 ESDI or ST506 drives, or a combination. The next 4 lines should be added if you want to be able to use up to 4 SCSI drives or use ESDI or ST506 drives at higher SCSI addresses.) sd4 2 0 disk sd4 at si0 drive 16 flags 0 sd5 2 1 disk sd5 at si0 drive 17 flags 0 sd6 3 0 disk sd6 at si0 drive 24 flags 0 sd7 3 1 disk sd7 at si0 drive 25 flags 0 Some Sun models, such as the 386i, are supplied with direct SCSI interface drives as the official Sun drives, so the numbering scheme is a little different: device scsi lun name address sd0 0 0 sd1 1 0 sd2 2 0 sd3 3 0 The Adaptec and Emulex boards both have switches to set the SCSI address. The Emulex board can connect to one or two ESDI drives, with the lun of each being determined by which connecter is used. If the shoebox that you have has room and another power supply connector, you can usually add another drive to it yourself. We have configured and sold systems that include 4 600 Mb direct SCSI interface drives and 2 different tape drives, all off the same 3/60. 2.4 Gbytes of disk and 2.36 Gbytes of tape, not bad for a 3/60 :<). Various places sell drives and/or shoeboxes, including us. Call me for details on setting the address switches, or contact Emulex and/or Adaptec. Currently, direct SCSI interface drives are probably a better deal as add-on drives, and most SCSI interface drives can work with most Sun workstations, it's just a matter of knowing what to tell diag or format. The ESDI drives are comparable in speed to SCSI, in fact, they are frequently the exact same drive with differing interface electronics. The ST506 drives are much slower, as a rule, than SCSI or ESDI drives, in access time, as well as being a much slower data transfer specification. > ... I can't find anything in the documentation I have >that shows how to set up the jumpers. The two shoeboxes currently on the >3/60 are targets 0 and 1, both units 0 (this corresponds to drives 0 and >8). The extra shoebox is configured as target 1, unit 0 (drive 8). I >would like to configure it as target 0, unit 1 (drive 1). That should work fine, but you don't need to bother changing the second drive, just add the other drives at higher addresses. Just don't forget to do a ./MAKEDEV sd- in /dev for whatever drive you are adding if it isn't already there, and re-build the kernel if needed with the extra configuration lines. >3. If 2. is possible, does the last shoebox (presumably target 0, unit 0) >need to be terminated in any way? Each end of the SCSI bus should be terminated. The Sun workstation provides termination for one end, the last disk (or interface board if the disks are ESDI or ST506) or tape drive should be terminated. There is either a pair of dip resistor packs, or 2 or 3 sip resistor packs that are removable. Direct SCSI interface drives almost always have a pair of jumpers that determine where the termination power comes from. These have to be set correctly, since the 3/50 or 3/60 (I can't remember which this late at night) shorts the SCSI line that is normally reserved for termination power. Hope this has been of help. Neil Gorsuch Uninet Peripherals neil@cpd.com uunet!zardoz!neil (800) 433-6784 outside California (714) 546-1100 inside California
dente%man.ee.els@ukacrl.bitnet (Colin Dente) (05/08/89)
dre@umn-cs.CS.UMN.EDU (Douglas R. East) writes: >1. Can more than two shoeboxes be placed on the SCSI port? According to >the Mass Storage Systems manual, only two can be--a unit with the 1/4" >tape plus an add-on unit. But this doesn't make a lot of sense to me, >after all, what is SCSI for? I would like to place a third 70M shoebox >since I happen to have one laying around. I can't really offer much help, other than moral support. I *know* that it can be done - as my Sun here used to have three shoeboxes hung off it (70Mb+1/4" tape, 70Mb, 140Mb). As to *how* it was done, I'm afraid I can't tell you - it was when I was first here, and we've since got the 327Mb disk which we were waiting for at the time (all the others were Sun demo gear that they lent to us after many complaints). I do recall the local Sun service rep coming in with the third shoebox under his arm and saying "I don't know whether or not this'll work, but...." So - ask Sun, and if they say it can't be done, tell 'em they're lying! (Machine was a 3/110 running 3.2 if it makes any odds). Colin Colin Dente | JANET: dente@uk.ac.man.ee.els Dept. of Electrical Engineering | ARPA: dente@els.ee.man.ac.uk University of Manchester | UUCP: ...!mcvax!ukc!man.ee.els!dente England | NB. these will work as of 28/4/89