Another disk cache flush issue question...

Power 8. IBM i hosting IBM i (and AIX). All IBM i partitions are running
IBM i 7.3.

We're replacing 57CE cards with updated 57CE cards due to an issue.

We did this on one 8286-41A and had no issue.
Quiesce all applications.
ENDWTR *ALL
ENDHOSTSVR *ALL
ENDTCPSVR *MGTC
ENDTCPSVR *CIMOM
ENDTCP
ENDSBS *ALL *CNTRLD DELAY(120)
DSPMSG QSYSOPR
Wait until message 'System ended to restricted condition' appears.
PWRDWNSYS *CNTRLD DELAY(120) RESTART(*NO) CONFIRM(*NO)
Watch HMC until it says the LPAR is shutdown.
Execute the shutdown -force command on the VIOS lpars.
Shutdown the rack using the HMC.
Replace the cards.

On our other 8286-41A we modified this slightly.
...
Wait until message 'System ended to restricted condition' appears.
PWRDWNSYS *CNTRLD DELAY(120) RESTART(*NO) CONFIRM(*NO)
...

In between those two lines we did a RCLSTG and a full system save.
On that machine when we brought it up it would not recognize the disk
drives. So we powered it all off again. Put the old cards back into
their respective slots. Powered up the system. Powered up the hosting
lpar manually. Went into DST and used that to power off (F10). Powered
off vios and the rack again. Replaced the cards with the new ones.
Started it all back up and it worked fine. Same IBM CE.

He'll be doing another machine on Saturday. Short of hanging rosaries on
it and sprinkling it with holy water is there some way to ensure that
cache is totally flushed? Got the same IBM CE doing it. Me, however,
will be on my way out of state on a Scout trip. A coworker will be
handling this.
I am willing to document some additional steps he may need.


Rob Berendt