🚀 go-pugleaf

In article <30OCT199211110385@csa2.lbl.gov> tonse@csa2.lbl.gov (Shaheen R 
Tonse (510)-486-6349) writes:


>>This is a followup to my earlier request for help installing a Micropolis 
>>1528 SCSI drive on a DecStation 5000 running Ultrix 4.1. I think the problem
>>was that the disk partitions were too big. I finally reduced them to:
>>(extract from /etc/disktab)

>> rz58|RZ58| Micropolis 1.2GB Winchester:\
>>   :ty=winchester:ns#84:nt#15:nc#2100:\
>>   :pa#32768:ba#8192:fa#1024:\
>>   :pb#32768:bb#4096:fb#1024:\
>>   :pc#2621688:bc#8192:fc#1024:\
>>   :pd#0:bd#8192:fd#1024:\
>>   :pe#0:be#8192:fe#1024:\
>>   :pf#0:bf#8192:ff#1024:\
>>   :pg#1200000:bg#8192:fg#1024:\
>>   :ph#1200002:bh#8192:fh#1024:

>>down from about 1270000 for g & h, and the problem went away! In addition, we
>>were never sure if the problem was a real one with the "newfs" & "mkfs" 
>>utilities, or whehter the problem was with "fsck" not knowing how to handle
>>such  large file systems (& we still don't know but at least it works now).
>>				   Regards, S.Tonse.

Shaheen,

  The problem is that the addressing scheme in Ultrix v4.1 only supports a
drive size of about 1GB formatted (the RZ57 is a 1.2GB disk that formats down
to a 1.0GB). The addressing scheme went to the 10byte scheme in Ultrix v4.2 and
works just fine.

  I have included a cut from the ultrix-faq on gatekeeper that would have
tipped you off.



==============================================
16. Why doesn't ULTRIX 4.1 work with disks bigger than 1.2GBytes?

There is a bug in the V4.1 SCSI driver that will only allow it to read
something like (2 ** 21) or (2 ** 20) LBNs.  After that it wraps
around to the beginning of the disk.  It is fixed in V4.2.




I hope that helps you understand it.

				Thanx,
				  AJ


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