Adding a Fujitsu 2361 (Eagle-2) disk to VAX 750 under 4.2Bsd
Andrew Findlay
andyf at brueer.UUCP
Thu Jan 23 21:02:46 AEST 1986
Adding an Eagle-2 (Fujitsu 2361) to a 4.2Bsd system
===================================================
I have just put an Eagle-2 onto a VAX 750 under 4.2Bsd.
This article describes how it was done so you need not repeat
my mistakes. The software preparation and debugging took
about 40 man-hours, but with the information presented here
it should be possible in less than 8.
The initial configuration was: 2MB, TU80, RA80 on UDA50, DMF-32
The expanded configuration is: 5MB, TU80, RA80 on UDA50, 2*DMF-32
Eagle-2 on SC7002
The Fujitsu 2361 Eagle-2 is an expanded version of the well
known 2351A Eagle. It has an unformatted capacity of 689MB
against the Eagle's 474MB.
The first thing to note is that the disk transfer rate has
gone up from 1.859 MB/s to 2.458 MB/s. This means that the
Emulex SC7000 is not fast enough to handle the new drive. You
will need an SC7002, which is just a faster version of the
SC7000.
Another hardware point is that the Eagle-2 is in a bigger box
than the Eagle - 770mm long rather than 700mm. In our case this
means that it sticks out at the front of the cabinet.
Since the Eagle-2 was designed after the 4.2Bsd release, it
does not appear in /etc/disktab or in the hp.c drivers. You
will need to put it in. A quick-and-dirty workaround is to set
up the SC7002 to treat the disk as an old-style Eagle - you
lose storage capacity, but get up and running very easily. I
have not tried this.
Setting up the SC7002
=====================
Set up for an 'expanded RM02' emulation with 64 sectors/track.
This is code 30 on SW1-4. The hp.c drivers use 'RM02' as a flag
indicating that the disk type should be determined by asking
for the number of tracks, cylinders, and sectors. You need at
least revision F of PROM 994.
Preparing the drivers
=====================
(1) Use diskpart(8) to generate entries for /etc/disktab and
for the hp.c drivers. Put the result in files for use later.
Call the disk 'eagle2'.
The parameters are as follows:
Type: winchester
Sector size: 512
# Sectors/track: 64
# Tracks/cylinder: 20
# Cylinders: 842
Revs per minute: 3600
You should end up with a 'c' partition of 1077760 blocks.
(2) Install the 'eagle2' entry in /etc/disktab
(3) Put entries into your configuration file in /sys/conf,
something like this:
controller mba0 at nexus ?
disk hp0 at mba0 drive 0
This assumes the SC7002 will be the only massbus device - if
you already have massbus devices, the 0's above will change.
The SC7002 actually emulates a massbus controller AND up to
eight massbus disks on one board. (It can split a physical
drive into two logical devices)
(4) Before modifying the system source code, generate a
system from the new config file to check all is ok. If
the controller is installed at this stage, the system
should note the existence of an
'RM02 with 64 sectors/track?'
but should not try to use the device.
(5) Go into /sys/vaxmba to modify the main hp driver.
First take a copy of hp.c for safety, then make changes to hp.c
as follows:
Add the eagle2_sizes entry generated in stage (1) - put it after
eagle_sizes. It should look like this:
}, eagle2_sizes[8] = {
15884, 0, /* A=cyl 0 thru 12 */
66880, 13, /* B=cyl 13 thru 65 */
1077760, 0, /* C=cyl 0 thru 841 */
15884, 294, /* D=cyl 294 thru 306 */
307200, 307, /* E=cyl 307 thru 546 */
377408, 547, /* F=cyl 547 thru 841 */
701248, 294, /* G=cyl 294 thru 841 */
291346, 66, /* H=cyl 66 thru 293 */
Add two lines to hptypes[], just before the final 0:
#define HPDT_EAGLE2 15
-1,
These go just after the line that says 'beware, actually
capricorn or eagle'
Add TWO lines to the hpst[] array, as follows:
{ 64, 20, 64*20, 842, eagle2_sizes, 7, 8 }, /* DUMMY (place holder) */
{ 64, 20, 64*20, 842, eagle2_sizes, 7, 8 }, /* EAGLE-2 */
The dummy line is needed because hptypes[] has a dummy element
14, representing the RM02, whereas hpst[] does not. This one
held me up for a couple of days - the system panics when trying
to reference the disk if you miss the dummy entry.
In the section headed 'EMULEX SC750 or SC780', add code to
recognise the disk at boot time. Put it after the bit that
recognises an eagle:
if (ntracks == 20 && nsectors == 64) {
type = HPDT_EAGLE2;
printf("hp%d: eagle-II\n", mi->mi_unit);
goto done;
}
(6) Re-generate the system with the modified driver.
(7) Use /dev/MAKEDEV to make device entries for hp0
(8) Go into /sys/stand to modify the stand-alone hp driver.
In hp.c add a line to the end of hptypes[], so it looks like this:
.
.
.
MBDT_RM02, /* actually something else */
-1, /* 9300 */
-1, /* Eagle-II */
0
};
In hpmaptype.c add a line to describe the eagle2 and its disk
partitions. Be particularly careful if you did not use diskpart
in stage (1).
short eagle_off[8] = { 0, 17, 0, 391, 408, 728, 391, 87 };
short eagle2_off[8] = { 0, 13, 0, 294, 307, 547, 294, 66 };
Now add two lines in hpst[] so it looks like this:
.
.
.
#define HPDT_9300 13
32, 19, 32*19, 815, rm05_off, /* Ampex 9300 */
#define HPDT_EAGLE2 14
64, 20, 64*20, 842, eagle2_off, /* Fuji Eagle-II */
};
Now add the code to recognise the eagle2:
if (ntracks == 48) {
newtype = HPDT_EAGLE; /* 48 sector Eagle */
goto done;
}
if (ntracks == 64) {
newtype = HPDT_EAGLE2; /* 64 sector Eagle */
goto done;
}
printf("RM02 with %d sectors/track?\n", ntracks);
done:
(9) Reconstruct the standalone utilities with make, and copy
what you need into the root filesystem. This will
probably be:
format
copy
boot
drtest
On a 780, these should go onto the console floppy (?)
(10) Dump the ENTIRE system onto tape and then get the hardware
installed!
(11) The Emulex formatter does not seem to get the bad block
info in the right place for the hp driver, so use the
newly generated version of format(8) to sort that out (in
standalone mode of course). It is then worth using drtest(8)
to check that all the bad blocks have been found.
(12) When you boot up the new system, the lines:
mba0 at tr4
hp0 at mba0 drive 0
hp0: Eagle-II
(or something very similar) should appear on the console.
(13) You should now have a working 540MB disk. Create
filesystems with newfs(8) and put it to work.
To get the best possible performance out of the
filesystems, the rotational delay parameter needs to be
set appropriately with tunefs. I used Don Speck's test
program and found 8ms to be good, so the command is:
tunefs -d 8 /dev/hp0h
Remember to do this for each filesystem after creating it.
Perhaps surprisingly, I can find no significant difference
in performance between a filesystem on an RA80 and one on
an Eagle-2. These tests were done with a load factor of
about 1.4 - one active user with a cpu-bound process:
% time dd if=<big file on RA80> of=/dev/null bs=1024 count=1024
1024+0 records in
1024+0 records out
0.4u 4.8s 0:09 57% 13+9k 129+2io 2pf+0w
% time dd if=<big file on Eagle-II> of=/dev/null bs=1024 count=1024
1024+0 records in
1024+0 records out
0.3u 5.0s 0:09 59% 13+9k 263+2io 2pf+0w
Good luck, and please let me know if I have missed out anything
vital....
Andrew Findlay
... ukc!reading!brueer!andyf
... andyf at uk.ac.bru.ee
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