Cannot form DSA0:

[Steve-Thompson]

Hello Fox

Should Nigels idea is hitting the mark, boot a different disk (eg. CD) and do a mount/ov=(id,shad) .
This will zero the shadow generation information on the disk.

Steven

[FOX MULDER_2]

HI,

The outputs are :
SYSGEN> SH SYSTEM
Parameter Name Current Default Min. Max. Unit Dynamic
-------------- ------- ------- ------- ------- ---- -------
SYSTEM_CHECK 0 0 0 1 Coded-valu
SYSGEN> SH ALLOC
Parameter Name Current Default Min. Max. Unit Dynamic
-------------- ------- ------- ------- ------- ---- -------
ALLOCLASS 1 0 0 255 Pure-numbe
SYSGEN>

Also,the system is not in a cluster.
I have tried the following steps already:

At the >>> prompt boot the operating system CD ie B DKA600
When the menu option appears, select DCL commands.
at the $$$ prompt Mount/over=(id,shadow) DKB0:
When the disk is mounted write a scratch file to DKB0:
Dismount DKB0:
logout of the DCL interface and shutdown
At the >>> prompt, boot OBERON conversationally ie B -flags 0,1 DKB0
At the sysboot prompt set the parameter shadow_sys_disk to 1
Continue to boot.
The result is just the same.

Thanks.

[Volker Halle]

Fox,

if the system has completely written the dump - as shown in your initial post, you should be able to boot without shadowing the system disk and read the dump with ANAL/CRASH SYS$SYSTEM:

To see, if there is anything in the dumpfile at all, try:

$ DUMP/BL=COUNT=2 SYS$SYSTEM:SYSDUMP.DMP

Volker.

[FOX MULDER_2]

Hi,
Even after issuing the command :
DUMP/BL=COUNT=2 SYS$SYSTEM:SYSDUMP.DMP

Its showing the same.

OpenVMS (TM) Alpha System dump analyzer

%SDA-E-DUMPEMPTY, dump file contains no valid dump

Not sure if this is right,since the dump file, size is small therefore it is not updating.

Thanks,

[Volker Halle]

Fox,

the DUMP command given just dumps out the first 2 blocks of the dumpfile to your terminal screen. Are the values all zeroes ? Do you somewhere see the nodename in the ASCII data ?

Volker.

[FOX MULDER_2]

Hi,
I am sending the output.


Thanks

[Jur van der Burg]

00000000 0000353A 04000180 00000000

The 04000180 is a flags longword, and it indicates that the dumpfile write has not completed. It could be that a full dump instead of a partial dump was selected (system parameter dumpstyle) and that the dumpfile is too small. You may want to check that bit 0 is set in dumpstyle (enable partial dumps), and/or you may need to increase the dumpfile size.

Jur.

[Andreas Vollmer]

Hello Fox,

The used boot flags (fl) are not common, at least not for me.
Please explain the meaning of these.

Pls. try following:
b -fl 0,1 dkb0
- see what happened.
- if the system crashes again try following:

b -fl 0,1 dkb0
at the sysboot prompt:
show /cluster
show shadow

If it is possible disable shadowing - for troubleshooting purpose -
set shadowing 0
set startup_p1 "min"
cont

If the system is now bootable then we have to check the system parameters

The attachment contains an example of the mentioned system parameter settings.

--------------------------
here are some references for the SRM boot options.

http://h18002.www1.hp.com/alphaserver/docs/userguide/WebHelp/boot_flags_settings_table.htm

http://h18002.www1.hp.com/alphaserver/docs/userguide/WebHelp/boot_osflags.htm

Flags_ Bit Meaning
Value Number
1 0 Bootstrap conversationally
(enables you to modify SYSGEN parameters in SYSBOOT).
2 1 Map XDELTA to a running system
4 2 Stop at initial system breakpoint.
8 3 Perform diagnostic breakpoints.
10 4 Stop at the bootstrap breakpoints.
20 5 Omit header from secondary bootstrap file.
80 7 Prompt for the name of the secondary bootstrap file.
100 8 Halt before secondary bootstrap.
10000 16 Display debug messages during booting.
20000 17 Display user messages during booting.

Regards
Andreas

[Volker Halle]

Fox,

04000180

This indicates:

ERRLOGCOMP - errlog write complete
WRITECOMP is not set - dump write not completed
DUMPSYTLE = 1

Did you halt the system while the dump was being written ?

Volker.

[FOX MULDER_2]

Hi,
No,halt was not issued anytime.

The sysgen parameters are:
SYSGEN> SH DUMP
Parameter Name Current Default Min. Max. Unit Dynamic
-------------- ------- ------- ------- ------- ---- -------
DUMPSTYLE 1 0 0 -1 Bitmask
DUMPBUG 1 1 0 1 Boolean
SYSGEN>

Thnaks