30 Jan
2014
30 Jan
'14
8:31 p.m.
On Thu, Jan 30, 2014 at 11:42 AM, Ethan Dicks <ethan.dicks at gmail.com> wrote:
On Thu, Jan 30, 2014 at 1:47 PM, Jonathan Katz <jon
at jonworld.com> wrote:
You should also be able to use a SCSI HD > 1GB with the MicroVAX 3100
if you use sg3_utils to resize the reported SCSI HD capacity to
2097152 blocks (1GB / 512 bytes). Works for me with my MicroVAX 3100
with a SCSI HD with a native 9GB capacity.
Example:
C:\sg3_utils>sg_readcap.exe pd1
Read Capacity results:
Last logical block address=17849999 (0x1105e8f), Number of blocks=17850000
Logical block length=512 bytes
Hence:
Device size: 9139200000 bytes, 8715.82 MiB, 9.1392 GB
C:\sg3_utils>sg_format.exe --count=2097152 --resize --verbose pd1
inquiry cdb: 12 00 00 00 24 00
IBM DDRS-39130D DC1B peripheral_type: disk [0x0]
PROTECT=0
mode sense (10) cdb: 5a 00 01 00 00 00 00 00 fc 00
mode sense (10): pass-through requested 252 bytes but got 28 bytes
Mode Sense (block descriptor) data, prior to changes:
Number of blocks=17850000 [0x1105e90]
Block size=512 [0x200]
mode select (10) cdb: 55 11 00 00 00 00 00 00 1c 00
Resize operation seems to have been successful
C:\sg3_utils>sg_readcap.exe pd1
Read Capacity results:
Last logical block address=2097151 (0x1fffff), Number of blocks=2097152
Logical block length=512 bytes
Hence:
Device size: 1073741824 bytes, 1024 MiB, 1.07374 GB
http://sg.danny.cz/sg/sg3_utils.html
On Thu, Jan 30, 2014 at 12:39 PM, Ethan Dicks
<ethan.dicks at gmail.com> wrote:
Which VAX and how large is your disk?
I think it's more a case of, if you _try_ to use a larger disk on
these machines (MicroVAX 3100?), it works to a point, but the boot
ROMs can't access partitions past the first 1.05GB (20 address bits in
the older command packets, IIRC) and a crashdump will overwrite part
of your filesystem when the block addresses get truncated by stuffing
block numbers past 1GB into packets that can only address 1GB.
With the SCSI2SD, just stick a 1GB SD card in there and *poof*
compatible boot disk, I think (presuming it auto-sizes).
I would anticipate it should work fine in all of
those - of course it
wouldn't change the 1GB boot volume issue with certain models of VAX,
since that's the VAX firmware crafting the SCSI packets.
That may be why I can't get my Vax to boot from local disk!