ITEM: AI1769L
Sysback restore problem.
Question:
Bruce Figura cannot contact Randy Olson but system is down.
.ENV: C10 aix325.
.DESC: Customer attempted to reload from sysback tape but
gets header block error and restore stops.
.ACT: suggested he clean tape drive and try another sysback tape.
.NEXT: closing pcb.
Response:
DESC: Randy tried to reinstall the entire system consisting of
2 volume groups using a SYSBACK/6000 tape. He booted
off the sysback tape and started a full system backup. This
ran for a little while- long enough to create the volume
groups, logical volumes and then restore about 100 files
before failing with:
Error Missing Header Block
Attempt to Resync after error
*********************************************************
Austext shows:
"It sounds like the problem with the libc.a and fwrite at
3.2.5R. (3.2.5 E3 Oct '94 Release Notes 1.3)
A problem was found in AIX 3.2.5 Enhancement 3 with the fwrite
subroutine in libc. A technical description of the problem
follows. This problem exists in the following AIX 3.2.5 PTFs:
U432990, U433061, U433288, U433563, U433872, U434069
The problem is fixed in PTF U434997, which is currently available.
When sysback ver 3 reads the data it uses this method:
sbread | restore
The sbread command uses the fwrite to send the data to stdout
So since the fwrite command is messed up it will cause the data
to look corrupt even though the data is not."
*********************************************************
Currently the customer has already reinstalled base AIX 3.2.5
from an install tape. When he tries to restore individual files
from the sysbcak tape, it fails with the same 'Header Block'
error.
Next: Randy will complete the installation of lpps from the
install tape including tcpip.obj.
Then:
configure tcpip
ftp to aix.boulder.ibm.com (198.17.57.66)
download the fixdist application
install/configure fixdist
download the Sysback/libc.a fix U434997
run 'inutoc' on the download directory to create a .toc
run 'smit install' to install U434997
create a new sysback boot image and try and restore the
entire sysback tape, or just restore individual
filesystems from the Sysback tape
wocb on progress
Response:
DESC: Customer is now installing LPPs after re-install AIX. The
installation failed because bosboot ran out of space in /tmp.
ACT: Had the customer run bosboot -a -d /dev/hdisk0 after making
sure there was at least 7MB of space free in /tmp. The bosboot
ran without errors. Next I had the customer run lppchk -v to
verify the software just installed, but it returned with pages
of errors. Had the customer run:
ifreq | installp -BNXacgq -d /dev/rmt0.1 -f - 2>&1 /tmp/log
After the command completed, checked the log created and found
that it was empty. Ran lppchk -v and it came back clean this
time. Re-ran bosboot, which also completed successfully.
Next, helped the customer get FixDist from aix.boulder.ibm.com
via anonymous FTP and use it to obtain U434997 which was
identified previously as the fix needed to allow him to restore
successfully from his Sysback/6000 backup tape.
Customer will install U434997 and call back for further assist-
ance with restoring files selectively from his tape.
NEXT: WOCB.
Response:
Response:
The customer does not need to rebuild his system from scratch to fix
this problem. The customer has another systems with this fix already
applied to it. On that system with the fwrite fix create a bootable
sysback full system diskettes. Boot up the down system from these
diskettes and change the input device from the floppy to the tape drive
and start the install from the sysback full system backup tape.
That fixed the problem the customer was able to
reinstall his system from his backup. Now the customer can apply the
needed fix U434997 to the system.
The reason the above solution
is a bad idea is the customer would lose many days of configurations
that are stored in the ODM. Also the time it would take to get the
system set up exactly the way it was before. This method is much
faster with no configuation or data loss.
Order the ptf for the customer.
PMR: 3X295-378
PRIORITY: 1 (X,1-3) SEND LATEST SUPERSEDE Y
MEDIA: _ 1/4 INCH TAPE X 8MM TAPE _ DISKETTE _ 4MM TAPE
PB QUEUE: close_ SHIP INCOMPLETE ORDER: Y PMP LEVEL: 3250
APAR/PTF/VOLID: U434997
THE FOLLOWING PTFS HAVE BEEN ORDERED:
U434997 (3250)
EVERYTHING HAS BEEN ORDERED
Response:
Support Line: Sysback restore problem. ITEM: AI1769L
Dated: November 1995 Category: N/A
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