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DF / SE confusion

Enno Baars

DF / SE confusion


Looking at the disk modules installed in our A3311A "Jamaica" HA Storage System I stubled over some strange fact:

* All disk modules are labeled "DF" and are connected to a "DF" Interface on our server
So these are "differential SCSI" modules.

* ioscan reports these disks to be of type "Seagate ST19171N". According to Seagate these drives have a "SE" interface.
So the bare drives are "single-ended SCSI".

Now how can this be?
Does the module case (which encloses the bare drive) do some SE <-> DF conversion?

Any information is appreciated!





p.S. This thread has been moved from Disk to Disk array. - Hp Forum moderator

Oh God, I hate this damn machine, I wish that they would sell it! It never does that what I mean but only what I tell it.
Honored Contributor

Re: DF / SE confusion

HP may be able this better, but I have seen this same thing in these drives (an ST34573WC can be either SE or DF). I had taken the module apart (not recommended by the way) and there was an adapter of sorts attached to the drive.

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Vincent Fleming
Honored Contributor

Re: DF / SE confusion

As I recall, the product number reported in the response to the SCSI Inquiry command that ioscan issues does not distinguish the bus type in Seagate drives.
No matter where you go, there you are.