Server 330 (PB0)
The external SCSI connection must be "enabled". The 330 PB0 is often
shipped without the on-board adapter external connection enabled.
During the system boot, select Configuration (F1) and enable the
external SCSI connection for the on-board adapter.
The AIC7870.ADD device driver must be at the current level (preferably
January 1998 or later). The older versions of this device driver (circa 1995)
do not properly support external Fast/Wide sequential devices. To download
the most current OS/2 version of AIC7870.ADD, you should go to the
Adaptec web site (www.adaptec.com) and find their OS/2 device driver
update area; the file to download is 7800OS2.EXE.
You will notice this behavior during CONFIG.SYS processing when the tape
device driver reports that OS/2 presents only 1 sequential device
(the 4mm on the RAID adapter). This is usually reported when there are
multiple non-RAID adapters installed on the Server 330 PB0. You can do
three things: (1) verify that there is not a conflict in the interrupt
assignments among the various PCI adapters; (2) ensure that you
have the latest version of the AIC7870.ADD device driver (dated January
1998 or later); and (3) confirm that the OS2SCSI.DMD file is dated
7-18-95 or later.
Some of the likely reasons why the AIC7870.ADD driver would not be
loading are:
1. The Adaptec SCSI adapter has no SCSI devices attached to it which
are powered on.
2. Something is wrong with the status of the SCSI chain -- there could
be several causes: no SCSI termination; a bad SCSI cable; incomplete
connection of a cable to a connector; etc.
On an IBM Server 330, the interrupt assignments are very important in
order to avoid system "hangs". This problem is compounded by the fact
that there are very few available interrupts to go around and the P/390
and S/390 are only happy with there own separate interrupts. The main
advice: NEVER have an IRQ setting of AUTO; do not let the system
arbitrarily assign the interrupts -- it will invariably get them wrong.
The important tradeoffs are:
RAID on its own IRQ
All non-RAID SCSI on same IRQ
P/390 on its own IRQ
All channel cards on same IRQ
LAN not with RAID, must share w/ SCSI
Disable the USB and Ethernet if not in use
Here is a sample IRQ combination:
Planar IRQ settings:
RAID ----------- 15
SCSI ------------ 14
Ethernet -------- 14
(USB) ---------- (10)
PCI (Slot) IRQ settings:
SCSI (1) ------ 14
P/390 (4) ------ 11
S/390 (5) ------ 10
Server 330 (ES2)
4.1 Fast/Narrow tape drive (e.g., L490E) does not work when connected to the onboard SCSI adapter.
This problem is basically caused by the fact that a Single-ended, Fast/Narrow device (8-bit)
is being attached to a Fast/Wide (16-bit) SCSI adapter which requires
special configuration for F/N support. It will work but two things need to be done:
1. There is a jumper (J38) which needs to be changed so that the onboard
adapter will be set for handling external 8-bit devices. Refer to
Appendix A, "System Board Jumpers", in the Server 330 User's Guide, and
look for J38 - external SCSI termination.
2. The onboard adapter needs to be properly terminated. Ensure that you
have a terminator on the end of the cable to which the CDROM and internal
4mm tape drive are attached. Some 330 servers have a cable which already
has a terminator molded onto the end of the cable. If not terminated,
you should ask IBM for a SCSI-2 internal terminator (FRU 92F0322).
When attaching external tape drives to the RAID adapter on the Server 330,
the adapter will re-assign the SCSI ID according to its own sequence of
devices in use. Although you may have set the SCSI ID on a tape unit to
4 or 1, it may be presented as SCSI ID 3 (for example) to OS/2 when it
is brought up.
Use the "/T" parameter on the ISITAPE device statement in CONFIG.SYS to
view the "available" and "allocated" tape SCSI ID's to resolve any of
these "identity crisis" problems.
Yes, that's true. The problem as we understand it is that the onboard
SCSI adapter lacks sufficient electrical power to physically manage the
external SCSI loop with more than one external device.
If you need additional tape drives, we recommend that you install an
additional PCI SCSI adapter (e.g., IBM 76H5407, Adaptec AHA-2940UW).
Server 500
5.1 I've attached a Fujitsu M2488E (F/W) to my RAID adapter, but
OS/2 doesn't "see" it.
The IBM Fast/Wide RAID Adapter (70G9263) in the Server 500 was developed
at a time when IBM had no Fast/Wide sequential devices. Therefore, it
does not support any Fast/Wide sequential devices! In our opinion,
it will probably not be upgraded to support F/W devices since this RAID
adapter is out of production.
You will have to install a regular (non-RAID) SCSI-2 F/W Adapter (70G8498)
in order to attach a SCSI Fast/Wide tape drive to your Server 500.
5.2 64K tape processing errors on SCSI-2 F/W Streaming RAID.
Tape drives attached to the RAID adapter have experienced corrupted data
on read processing with 64K data blocks.
This is a known limitation of the F/W RAID adapter (70G9263). This problem
does not occur on the non-RAID SCSI-2 F/W adapter (70G8498).
Since this model of RAID adapter is out of production, we do not believe
that this problem will be corrected (that's our opinion).
Server 520
The CDROM and internal 4mm tape drive are attached to the 520's RAID
controller. So, whoever set up your system (was it you!) did nothing to
"activate" the onboard SCSI adapter. If you go to the "Selective Install"
folder you would see that no SCSI adapter is listed -- OS/2 didn't see
one when OS/2 went thru its install process.
You need to do two things:
1. Change the jumper setting on the motherboard to enable the onboard SCSI adapter and
perform the hardware configuration to add the tape drive (which will now be detected).
The jumper block should be in the "UP" position on Jumper 26. The legend
"J26" is printed on the system board above the set of vertical jumper pins.
WARNING: For the next step, do not use the IBM2SCSI.ADD file that is on
the OS/2 CDROM -- it is outdated. Load a newer file from one of IBM's
OS/2 web sites or go to the P/390 web site (see link on our home page).
2. After you IPL OS/2, go to the "Selective Install" folder and select the
SCSI Adapter item. The proper SCSI adapter will be highlighted by default.
Complete the selective install process. The SCSI adapter will be activated
the next time you IPL OS/2.
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