User`s guide

What happens if all eight LUNs are not configured as units?
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# iostat rz16 5 4
tty rz3 rz4 rz16 rz16 cpu
tin tout tps bps tps bps tps bps tps us ni sy id
00 00 00 0126310297
0 0 0 0 0 0 0 1618 34 1 0 2 98
0 0 0 0 0 0 0 1639 34 1 0 2 98
0 0 0 0 0 0 0 1610 34 1 0 2 98
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If all eight LUNs for a Target ID are not configured on an HSZ40, then the
number of entries seen in iostat will be equal to the number of units that are
configured for a HSZ40 Target ID.
In the above example, only units D0 and D7 are configured on the HSZ40. The
corresponding DEC OSF/1 Block Mode device names are rza16 and rzh16. The
example shows the output from iostat given the following conditions:
• All eight entries for rz16 are in the configuration file
• Only D0 and D7 are configured on the HSZ40
• The corresponding DEC OSF/1 Block Mode device names are rza16 and rzh16
The method for reading the output from iostat is to read the LUNs in ascending
order from left to right. You must be aware of the available LUNs. In the
previous example the user must know that only rza16 and rzh16 exist and that
they refer to LUN 0 and LUN 7.
Therefore, the method for reading the above example, is:
• The first rz16, reading from left to right, relates to rza16 or LUN 0.
• The second rz16, relates to rzh16 or LUN 7.
8.19 Using genvmunix
If genvmunix is used to initialize the system, and if doconfig is used to build a
new configuration file, then the new configuration file only lists the HSZ40 LUN
0 units. Also the naming format for those LUN 0 units is in the format of rznn.
The nn represents the numeric number as used in the following formula:
( 8 * Host Side SCSI Bus #) + (Target ID from HSZ40 unit number)
Nonzero (0) LUNs do not appear in the new configuration file.
Before rebuilding a configuration file using genvmunix, any existing customized
configuration file that was created to include HSZ40 units should be saved. Then
after the new configuration file is rebuilt, the existing entries from the customized
configuration file can be added to the new configuration file.
A better procedure would be to extract just the HSZ40 device-specific entries
into a separate file. After the new configuration file is built from a genvmunix
initialization, merge this separate file and the new configuration file together.
The result is that this new file will contain those specific HSZ40 device names.
Then use doconfig with the -c option, specifying the merged configuration file
name.
Operating System Support 8–43