Hello,
Can someone explain how SCSI the addressing works (in plain english)
on a HSZ40 controller.
I'm running with Alpha 2100s both connected to a storage array.
We are using Decsafe, LSM, and Advfs. DU 3.2C/
The way I understand it is that there are 4 SCSI slots
on the host side and 6 ports on the device side.
Questions:
1) Is this right?: formula: 8 * (scsi Bus #) + (slot # on bus) = dev number
What's the '8' represent in the formula?
2) For rz16 the config file is:
device disk rz16 at scsi2 drive 128
Is the '128' the 'dev number' or the Logical Unit Number (LUN)?
3) In DecSafe am I limited to four services on each SCSI Bus?
For example, if I have defined: rz16 disks as Service1
rz17 disks as Service2
rz18 disks as Service3
rz19 disks as Service4
How can I define a fifth service?
Will I need another HSZ40?
4) Am I limited to 8 rz28s disks in creating a logical volume using LSM?
Devices on SCSI Bus 2 (using the formula):
? scsi bus
| | slot LUN?
| | | |
rz16 = 8 * 2 + 0 = 16
rz17 = 8 * 2 + 1 = 17
rz18 = 8 * 2 + 2 = 18
rz19 = 8 * 2 + 3 = 19
Devices on SCSI Bus 3:
rz24 = 8 * 3 + 0 = 24
rz25 = 8 * 3 + 1 = 25
rz26 = 8 * 3 + 2 = 26
rz27 = 8 * 3 + 3 = 27
+------+ +------+
| 2100 | | 2100 |
+------+ +------+
| | | |
| | SCSI Bus 2 3 2 1 0 | |
| +-----------------------o-o-o-o--------- |
| 3 2 1 0 | | | | SCSI Bus 3 |
----------o-o---o-o---------)-)-)-)-------------
| | | | | | | |
+---------+ +---------+
| HSZ40 | | HSZ40 |
+---------+ +---------+
| | | | | | | | | | | |
a b c d e f a b c d e f
| | | | | | | | | | | |
| | | | | | +-+---+
===========-+-+ ====+=+==== =+=+======= ===========
r r r r r r r r r r r r r r r r r r r r r r r r
z z z z z z z z z z z z z z z z z z z z z z z z
2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8
| | | | | | | | | | | | | | | | | | | |
| +-+ +-+-----+-+ +-+ | +-+-+-+----+-+ +-+ +-+
r r r r r r r r
z z z z z z z z
2 2 2 2 1 1 1 1
6 5 4 7 8 6 9 7
Parts of my config file:
...
controller scsi2 at pza0 slot 0
device disk rz16 at scsi2 drive 128
device disk rz18 at scsi2 drive 144
device disk rz19 at scsi2 drive 152
...
controller scsi3 at pza1 slot 0
device disk rz24 at scsi3 drive 192
device disk rz25 at scsi3 drive 200
device disk rz26 at scsi3 drive 208
device disk rz27 at scsi3 drive 216
...
Thanks,
Lester Mayeda
Cedars-Sinai Medical Center
mayeda_at_csmc.edu
Received on Tue Dec 10 1996 - 22:12:34 NZDT