Restore Older Perl Version from Alternate Disk on AIX

Step-by-step instruction for fixing the Perl version by copying the old Perl from the alternate disk (alt_rootvg) in AIX

1: Backup current Perl directories
# cd /opt
# mv perl perl.old
# cd /usr/opt
# mv perl perl.old

2: Wake up the alternate root volume group disk
Replace hdiskX with the actual disk identifier of your alt_rootvg.
# alt_rootvg_op -W -d hdiskX # Wake up the alt_rootvg disk

3: Copy Perl from the alternate rootvg to the active filesystem
# cd /alt_inst/opt
# cp -rp perlX /opt/
# cd /alt_inst/usr/opt/perlX
# cp -rp perlX /usr/opt/
Note: Replace perlX with the actual Perl directory name from the alt_rootvg.

4: Create symbolic link for Perl binary
# cd /usr/bin
# ln -s /usr/opt/perlX/bin/perlX perl

5: Verify Perl version
# perl -v

6: Put the alternate disk back to sleep
# alt_rootvg_op -S -d hdiskX # Sleep the alt_rootvg disk

Summary:

• This procedure backs up your current Perl installation.
• Activates the alternate rootvg disk.
• Copies the old Perl installation from it.
• Creates a symlink so perl points to the old version.
• Then puts the alternate disk back to sleep.
  
  

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Restore Perl from Alternate Rootvg on AIX

1: Copy Perl directories from alternate rootvg

# cp -pr /alt_inst/usr/opt/perl5 /usr/opt/

# cp -pr /alt_inst/opt/perl5 /opt/

2: Create a symbolic link for perl binary

# cd /usr/local/bin

# ln -s /usr/opt/perl5/bin/perl perl

3: Verify Perl version

# perl -V