[Info-vax] Volume Shadowing & Cluster Satellite

[Phillip Helbig---undress to reply]

In article <r24g69-epd.ln1 at news.sture.ch>, Paul Sture <paul at sture.ch>
writes: 

> >>today I tried to fiddle around with volume shadowing on OpenVMS 7.3-2.
> >>So far everything worked as expteced. The boot node's device changed
> >>from DKA0: to DSA0:. But the satellites were unable to boot from the
> >>"new" cluster system disk. I changed all references in
> >>SYSTARTUP_VMS.COM, SYLOGICALS.COM and in LANCP. Satellites did boot,
> >>entered the cluster but immediately afterwards before the beginning of
> >>STARTUP.COM they reported:
> >>    boot device is already mounted as a shadow set member
> > 
> >>Thus, where else do I have to change the device name?
> > 
> > Did you change the shadowing sysgen parameters (such as SHADOWING,
> > SHADOW_SYS_DISK and SHADOW_SYS_UNIT) ?
> 
> And ensure that ALLOCLASS is set to an appropriate non-zero value.

In MODPARAMS.DAT, I have

AGEN$INCLUDE_PARAMS SYS$SYSTEM:AGEN$COMMON.DAT     !all nodes
AGEN$INCLUDE_PARAMS SYS$SYSTEM:AGEN$BOOTSERVER.DAT !bootserver nodes

You could add one for stuff just for satellites as well.  MODPARAMS.DAT 
itself otherwise contains stuff unique to the node in question or 
parameters which could be different on different nodes:

! standard stuff
SCSNODE="LEEBIG"
SCSSYSTEMID=1024+150
! cluster_config
VOTES=1
! shadowing
ALLOCLASS=150
TAPE_ALLOCLASS=150
! system-disk shadowing
SHADOW_SYS_UNIT=150
PAGEFILE2_NAME="DISK$SWAPPAGE_150:[SYS150.SYSEXE]PAGEFILE2.SYS"
MIN_PAGEFILE2_SIZE=528400
SWAPFILE2_NAME="DISK$SWAPPAGE_150:[SYS150.SYSEXE]SWAPFILE2.SYS"
MIN_SWAPFILE2_SIZE=18400

Something I thought about once then carried out and which has saved me a
lot of time: give every node a number, e.g. 150 in the example above.
SCSSYSTEMID=1024+150, IP-address: 192.168.1.150, ALLOCLASS=150,
TAPE_ALLOCLASS=150, SHADOW_SYS_UNIT=150, the system boots from SYS150 (I 
know its not decimal; the idea is to have numbers easy and obvious to 
me).  You could even put 150 in the name.