bownesrm@crdgw1.ge.com (11/09/89)
Has anyone out there tried to get more than one Sun to share a SCSI disk for data only? I realize it won't boot this way, but it would be usefull to me to be able to share a disk between one or two machines for data. Certainly better than pumping the bits out over an ethernet where they have to contend with 100 other machines...
mjacob@sun.com (Matt Jacob) (11/17/89)
Yeah, I actually tried this with a SS-1 && a 4/110. If you have an SS-1, here is what I did. Patch the kernel to run no disconnect/reconnect (a lot of SCSI disks I've run into get confused about accepting multiple commands from different inititators). Procedure: as root, adb -w /vmunix scsi_options?W 0x10 $q Set the scsi initiator id for the SS-1 to something other than it's default (7), e.g., as root, eeprom scsi-initiator-id=6 (halt, power on-off, or get into the forth monitor (n to the > prompt) and enter reset). You should be able to hook up another SS-1, or a 4/110 and run with both of them seeing each other's disks, tapes, etc. Try to not have each system boot or swap off the same partitions- madness results. Ditto for mounting partitions writable by each other- instant destruction. It's a good way for sharing read-only data though, and in the future with, say, a large juke-box changer, a way for a couple of stations to access terabyte image files, etc...