val@swamps.UUCP (Val Christian) (09/23/89)
After quite a bit of aggravation, I've finally decided to put this to the
net, in hopes that some of you may be able to help out.
Configuration:
AT-type PC with a "Type 2" drive (20Mb) and a ST4096 disk. Microport
2.3, with 2.4 winchester drivers.
Problem:
1) Apparent inability to establish a DOS partition on the second (ST4096)
drive which does not clobber a UNIX file system (/dev/dsk/1s1).
2) Also, the apparent inability to properly address a DOS partition via
dosdir and doscp commands on the first drive.
3) UNIX file system (/dev/dsk/1s1) is broke somewhere between block 12900
and 17900; subsequent writes cause the available inodes to reduce to 0.
fsck appears to fix.
Discussion:
1.) Apparently, a mkfs on /dev/dsk/1s1, and subsequent use of that
file system acts on the DOS partition, as shown in the fdisk and
divvy -d excerpts below. If the DOS partition is formatted, filesystem
/dev/dsk/1s1 gets clobbered. If the filesystem is mkfs, then the DOS
partition gets clobbered. It is necessary to have the DOS partition be
the first partition on the ST4096, as DOS (3.1) doesn't know how to handle
the larger number of heads and tracks of the 4096. I tried Disk Manager,
but apparently it is incompatable with Microport, as it uses the boot
track (0). Disk Manager works fine with DOS solo, but not with Microport.
2.) This may be for reasons stated above, as well as a outrageous entry
in the DOS partition entry in the Slice talbe for Drive 0. How can I patch
the Slice Table?
3.) This one puzzles me, except that the end of the DOS partition is at
about the point where things break. I want (need!) two separate UNIX
file systems on the second drive.
Bottom Line:
I am open to information and suggestions. The ability to have three
UNIX file systems, and two DOS partitions is an interest. I have
done some experimentation to help analyze the situation, but have
not formulated any solutions.
APPENDIX: fdisk information and divvy -d excerpts
FDISK assignments
Drive 0 (Type 2)
Part # Status Type Start End Size Blocks
4 A System5 1 510 510 34680
3 N DOS 511 613 103 7004
Drive 1 (ST4096)
4 N DOS 3 170 168 25704
3 A System5 176 1021 846 129438
divvy -d excerpts:
CONTENTS OF PARTITION END RECORD FOR UNIT #0
Drive Table
----- -----
Number of cylinders: 615
Number of heads/cylinder: 4
Landing zone: 615
Write precomp: 300
Sectors/track: 17
Sector size: 512
Number of alternate cylinders: 0
Actual sectors/cylinder: 68
...
Slice Table
----- -----
Slice 0 ROOT -- first sector: 68, number of sectors: 12000
Slice 1 SWAP -- first sector: 12068, number of sectors: 10000
Slice 2 USR -- first sector: 22068, number of sectors: 11660
Slice 3 TMP -- first sector: 22068, number of sectors: 0
Slice 4 Reserved -- first sector: 0, number of sectors: 0
Slice 5 DOS partition -- first sector: 1869182064, number of sectors: 757932142
Slice 6 UNIX partition #1 -- first sector: 0, number of sectors: 0
Slice 7 UNIX partition #2 -- first sector: 0, number of sectors: 0
Slice 8 UNIX partition #3 -- first sector: 34748, number of sectors: 7004
Slice 9 UNIX partition #4 -- first sector: 68, number of sectors: 34680
Slice 10 Entire disk -- first sector: 0, number of sectors: 41820
Slice 11 Last track active pt -- first sector: 34731, number of sectors: 17
...
CONTENTS OF PARTITION END RECORD FOR UNIT #1
Drive Table
----- -----
Number of cylinders: 1023
Number of heads/cylinder: 9
Landing zone: 1023
Write precomp: -1
Sectors/track: 17
Sector size: 512
Number of alternate cylinders: 0
Actual sectors/cylinder: 153
...
Slice Table
----- -----
Slice 0 ROOT -- first sector: 26928, number of sectors: 0
Slice 1 SWAP -- first sector: 26928, number of sectors: 0
Slice 2 USR -- first sector: 26928, number of sectors: 128418
Slice 3 TMP -- first sector: 26928, number of sectors: 0
Slice 4 Reserved -- first sector: 26928, number of sectors: 0
Slice 5 DOS partition -- first sector: 26928, number of sectors: 60000
Slice 6 UNIX partition #1 -- first sector: 86928, number of sectors: 68418
Slice 7 UNIX partition #2 -- first sector: 86928, number of sectors: 0
Slice 8 UNIX partition #3 -- first sector: 26928, number of sectors: 129438
Slice 9 UNIX partition #4 -- first sector: 459, number of sectors: 25704
Slice 10 Entire disk -- first sector: 0, number of sectors: 156519
Slice 11 Last track active pt -- first sector: 156349, number of sectors: 17
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Val Christian
UUCP: ...attctc!swamps!val
...rochester!kodak!swamps!valnvk@ddsw1.MCS.COM (Norman Kohn) (09/25/89)
In article <63@swamps.UUCP> val@swamps.UUCP (Val Christian) writes: >I am open to information and suggestions. The ability to have three >UNIX file systems, and two DOS partitions is an interest. I can't solve the problem you posed, and no longer have SVAT up (I've migrated to unix386). When I ran SVAT I used 3 unix partitions on drive 0: this is readily done by using the designators for other partitions (e.g., /dev/rdsk/0s7). You might want to try some such... I suspect that the sub-partitions of the active partition on drive 1 never got tested very thoroughly. -- Norman Kohn | ...ddsw1!nvk Chicago, Il. | days/ans svc: (312) 650-6840 | eves: (312) 373-0564