(04-02-2020, 07:24 PM)Raion Wrote: There's no reason to use a SCSI2SD on an Octane. The Octane, unlike the Indy or Indigo2, is a LOW VOLTAGE DIFFERENTIAL SCSI bus, unlike the single-ended buses of the Indy, Indigo2 etc, and the HVD bus of some of the IRIS units.
Low-voltage differential devices, not buses, are generally backwards compatible. The bus in the Octane is probably not compatible, and that adapter you're using is a passive adapter. You cannot do this.
A few corrections:
1. The Octane has a 40MB/s single-ended ultra-wide SCSI bus (QL1040 chip). It is possible to install a Qlogic 12160 dual channel 160MB/s LVD SCSI card in a PCI cage, but this isn't standard. The same is true for the other systems of it's generation, like the O2 and the Origin 200/2K and Onyx2 series. The QL12160 chip is also used in the Fuel / Tezro / Origin 3x0/3K and Onyx 3K series, these have LVD standard.
2. The original Onyx and Challenge are the ones with fast-wide HVD SCSI (20MB/s). There are some PCI and XIO option cards for the Octane/Origin series with ultra-wide HVD capability (40MB/s). "IRIS" is a term normally used with either the first gen MIPS systems, or the 68K systems before them. These had synchronous SCSI1, 5MB/s, if they had SCSI at all.
3. LVD SCSI controllers are backwards compatible with SE devices, but this will force the whole bus into SE mode, potentially limiting performance of other LVD devices on the bus. SCSI is generally backwards compatible all the way down. The one exception is the ultra-320 LVD specification which doesn't mandate narrow SCSI compatibility any longer. Thus, some newer LVD disks may not work in an Indy for example. There is no compatibility at all between SE/LVD on one side, and HVD on the other, except if you use a special bus bridge.
NB: I have no idea whether a SCSI2SD works with an Octane.
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