<div dir="ltr"><div>Interesting information. TY. I am considering getting a ZuluSCSI board since the SCSI2SD v5 is NLA. Do you endorse it? <br></div><div>Thanks</div><div>J</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jul 27, 2023 at 4:01\u202fPM vom513 via rescue <<a href="mailto:rescue@sunhelp.org">rescue@sunhelp.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
> On Jul 27, 2023, at 12:54 PM, Jonathan Sturges via rescue <<a href="mailto:rescue@sunhelp.org" target="_blank">rescue@sunhelp.org</a>> wrote:<br>
> <br>
> Hi,<br>
> Nice summary, your understanding is correct. Some small additions:<br>
> <br>
> * Some OSes -- Solaris2, I'm fairly sure, maybe later SunOS? -- the SCSI drivers can issue the block size change command when the OS is running (or are able to handle the 2k block size).<br>
> * OBP 3.x can issue the block change command too, IIRC; it's really OPB 2.x and prior that have the hard requirement of a 512-byte block requirement for booting.<br>
> * Besides Plextor, most Panasonic, Toshiba and Pioneer drives have jumperable block sizes.<br>
<br>
Thanks for the reply/confirmation.<br>
<br>
I did a bit more experimentation with the ZuluSCI and figured I\u2019d post my results to the list to benefit any future folks who might be looking for this type of info.<br>
<br>
- CD6.iso : Zulu log shows it coming up in 2048-byte mode, but my sun4c/m machines boot fine from it. I don\u2019t see a MODE SELECT in the log - I guess the ZS is just operating in \u201csoft\u201d block mode and honoring whatever request comes in ? (This is great by the way - not looking a gift horse in the mouth)<br>
<br>
- CD6_512.iso : Block size specified as 512. Works as expected.<br>
<br>
- CD6_2048.iso : Block size specified as 2048. Machines will NOT boot. <br>
<br>
So it seems like _<BLOCKSIZE> is a \u201chard\u201d setting. Omitting this seems to run the device in \u201csoft\u201d mode (hard/soft just my personal terminology for this behavior).<br>
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</blockquote></div>