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Two Different SCSI controller's fighting

By rharrison ·
I have PII-400 Server w 256 megs of RAM and an Itel Chipset on the Mboard. It has a Mylex FAST & Wide SCSI controller with a raid 5 array of 9Mb drives (18 GB total).
I am trying to add a adaptec 2940 narrow SCSI2 contrllor to this config. When I add the second controler the SCSI ID's on cards go nuts.... sometimes the mylex is controller 0 and the adaptec is 3 or when you reset the adaptec is 0 and the mylex is 1. This of course reeks havoc with the tape drive I trying to put on the adaptec controller. When the SCSI bus resets it can't find the drive anymore...no tape backup for me!! BOSS unhappy HELP!!

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Two Different SCSI controller's fighting

by Bill Cassada In reply to Two Different SCSI contro ...

It should be possible, and preferable, to set the controller ID numbers in the SCSI Bios. If they manage to both set to the same number massive confusion is certain to be the result. If you can hardcode them yourself instead of letting the controllers pick and choose it should elimininate your troubles.

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Two Different SCSI controller's fighting

by rharrison In reply to Two Different SCSI contro ...

Already tried this. hard setting does'nt work either

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Two Different SCSI controller's fighting

by maz1980 In reply to Two Different SCSI contro ...

Maybe the SCSI BIOS have bugs, so update their SCSI BIOS, both card.

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Two Different SCSI controller's fighting

by rharrison In reply to Two Different SCSI contro ...

I already have already downloaded the latest BIOS for the cards

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Two Different SCSI controller's fighting

by rogerndgreen In reply to Two Different SCSI contro ...

I assume that your problem is the order the cards are detected, as on each SCSI bus the controllers can have the same SCSI ID (you can't have conflicts on the same bus.

When the server boots up, wait fro the Adaptec banner to appear, and then press Ctrl-A to enter the Adaptec bios setup.
If all you are doing is hanging the tapedrive off this, and the mylex for the disks (good config!), then choose the options to NOT spin up any drives it sees, do NOT reserve any bios space for bootable devices (unless you have a unix server which will want to boot off tape?) and even to not scan for any devices except the scsi ID that the tape is on (which can be the same as any of the disks, because it is on a different controller).
You may need toexperiment with putting the scsi cards into different PCI slots, as some server m/bs are very picky about the order they will see add-in cards (Mitsubishi spring immediately to mind!). Check to see if there are any m/b bios updates you may need to apply, and check the m/b bios settings, there may be something in there to specify a detection order.
You shouldn't have problems in this setup. All my servers I use have duplexed Adaptec SCSI controller cards for the disk arrays, and a third dedicated Adaptec card fro the tape & CD. All the controller cards are set to SCSI ID 7, but there isn't a clash, because they are separate buses.
I hope this helps, but good luck!

Roger Green

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Two Different SCSI controller's fighting

by rharrison In reply to Two Different SCSI contro ...

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Two Different SCSI controller's fighting

by rharrison In reply to Two Different SCSI contro ...

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