ITEM: BH3322L

Problems with restore of sysback

Question:

Env:
  AIX 3.2.5
  Sysback 3.3  
  RISC 590

Desc:
  Customer is able to do a full system backup with out 
  problems, but on the verifiy or restore the restbyname
  command prompts for a second tape. 

Action:
  This should never occurr since sysback puts the data to
  tape using this method:

  cat filelist | backbyname | sbwrite
  
The backbyname command should never know when it has hit end
of tape, that is a function of the sbwite command.

To restore sysback uses this method:

sbread | restbyname

Once again the restbyname should never know it has hit the
end of tape that is a function of the sbread command.

For a test I did this.

find /filesystem -print | backup -ivqf /dev/rmt0

After about 30mb into the backup it prompted for another tape.
The customer is able to use tar and cpio without problems.
I had the customer run a fsck in the filesystem (no errors where
found).  This problem exist on 6 other systems as well.  All
in the same filesystem.  I had the customer run the command 
against /dev/null and got the same results.

ls -l  (in that directory)

lrwxrwxrwx   1 root  sys  0 Apr  5 10:46 tk2cavx3.res ->
lrwxrwxrwx   1 root  sys  0 Apr  5 10:46 tk2cdec.res ->
lrwxrwxrwx   1 root  sys  0 Apr  5 10:46 tk2cdgd2.res ->
lrwxrwxrwx   1 root  sys  0 Apr  5 10:46 tk2cdgd4.res ->
lrwxrwxrwx   1 root  sys  0 Apr  5 10:46 tk2chft.res ->
lrwxrwxrwx   1 root  sys  0 Apr  5 10:46 tk2chftc.res ->
lrwxrwxrwx   1 root  sys  0 Apr  5 10:46 tk2chp.res ->

You can make this link like this.
ln -s "" file

We have a fix for this.  It needs to be backported to
3.2.5.  The problem does not exist at AIX 4.1

Fixed with APAR IX57585 (currently not released)

APAR= IX57585 BACKUP PROBLEM WITH 0 LENGTH SYMLINKS

ERROR DESCRIPTION:                              
 The backup (byname) command will prompt for a
 second tape if it encounters a symbolic link
 of zero length. These links arent of much use,   
 but can still be created with: ln -s "" name 

Next Action:
  The customer will either need to remove those links or 
  use a different backup until the problem is fixed    



Support Line: Problems with restore of sysback ITEM: BH3322L

Dated: April 1996 Category: N/A

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