[SunHELP] D1000/Multiple Hosts/Initiator IDs

[sunhelp at sunhelp.org]

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Setting the scsi-initiator-id on PCI Systems (E250/E450)....

(26 March 2001)

Shared storage in clusters uses the Multi-Initiator capability of the SCSI
specification. PCI systems use PCI host adapter cards for the SCSI
interface.
Otherwise, the operation is the same as in SBus systems. The
scsi-initiator-id
must be changed because you cannot have two controllers (or SCSI devices)
with
the same SCSI ID on the same SCSI chain. This is true for all shared
storage.

However, the scsi-initiator-id of controllers that link private storage
should
be returned to 7 or it will conflict with the SCSI ID 6 of the CD-ROM. Also,
for 6-slot MultiPacks you must change the SCSI IDs to the 9-14 range. Use
the
switch on the back of the MultiPack to change this.

The normal documented procedure for setting up dual-hosted MultiPacks is to
set the scsi-initiator-id for one node to 6 and then reset specific SCSI
adaptors (ones that are not attached to the dual-hosted disks) to 7. The
scsi-initiator-id for the other node attached to the disk must be left at
the
default setting (7). This approach may be somewhat error-prone because you
can
get SCSI errors if you do not reset ALL of the adaptors that are NOT
attached
to the dual-hosted disks to 7.

A method that works well is to leave the scsi-initiator-id for both nodes to
7. Then, set the scsi-initiator-id for ONLY the adaptors that are connected
to
the dual-hosted disk to 6 on one of the nodes (normally the second node). Do
NOT change jumper settings on any SCSI device (CD-ROM). Do NOT change the
scsi-initiator-id to 8 because it will cause a conflict with some other
storage devices (D1000).

Only change the scsi-initiator-id on one node in the chain of the
dual-hosted
SCSI device. At the ok (OBP) prompt, use the probe-scsi-all command to
identify the controllers connected to the shared storage and those connected
to private storage. You may have to first do a reset-all before the
probe-scsi-all command will work. Depending on your configuration, there are
two methods of doing this.

Method 1
Note: Use Method 1 if your system is a Sun Enterprise 450.

If more controllers are connected to private storage than controllers
connected to shared storage, more scsi-initiator-id 7s than
scsi-initiator-id
6s, or more private storage controllers than shared storage controllers:

Note: Steps 1 through 5 should be done on one of the nodes attached to the
disk. Step 6 needs to be done on both nodes (assuming you are not using
Ultra
SCSI):

1. Edit or create the nvramrc to set the scsi-initiator-id to 6 for these
devices. From the OBP enter:

ok nvedit
ok probe-all install-console banner
ok cd /pci at 6,4000/scsi at 3
ok 6 " scsi-initiator-id" integer-property
ok device-end
ok cd /pci at 6,4000/scsi at 2,1
ok 6 " scsi-initiator-id" integer-property
ok device-end

2. Do a ctrl-c, and store the nvramrc:

ok nvstore

3. Evaluate the nvramrc:

ok nvramrc evaluate

4. Set the system to use the nvramrc:

ok setenv use-nvramrc? true

5. Do a reset:

ok reset-all

6. Edit the /etc/system file (on both nodes) and add the following line to
set
fast/wide SCSI (disable Ultra SCSI):

set scsi_options=0x3f8

7. Boot both systems and verify that you can see the multi-hosted disks from
both nodes.

Method 2
If the system is not an Enterprise 450, and there are more controllers
connected to shared storage than controllers connected to private storage,
more scsi-inititator-id 6s than scsi-initiator-id 7s, or more shared storage
controllers than private storage controllers, then:

1. Set the global scsi-initator-id to 6:

ok setenv scsi-initiator-id 6
scsi-initiator-id = 6

2. Edit or create the nvramrc script and set the scsi-initiator-id of the
controllers connected to private storage to 7. The line number (0:, 1:, and
so
on) are printed by the OBP, for example:

Caution - Insert EXACTLY one space after the double quote and before
scsi-initiator-id.

nvedit
0: probe-all
1: cd /sbus at 70,0/SUNW,fas at 1,8800000
2: 7 encode-int " scsi-initiator-id" property
3: device-end
4: cd /sbus at 70,0/QLGC,isp at 0,10000
5: 7 encode-int " scsi-initiator-id" property
6: device-end
7: cd /sbus at 50,0/SUNW,fas at 1,8800000
8: 7 encode-int " scsi-initiator-id" property
9: device-end
10: install-console
11: banner [Control C]
ok

In this example, you have set three controller scsi-initiator-ids to 7. Your
script may be different because you will be resetting controllers that were
listed by the probe-scsi-all command.

3. Store or discard the changes.

ok nvstrore
ok

ok nvquit [This will discard the changes]
ok

4. Enter the nvedit command to create and store an nvramrc script.

ok set use-nvramrc? = true
ok reset-all

5. Connect the shared storage devices and then enter:

ok boot -r


Dennis Lund


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