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Mksysb and Savevg woes

 
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# 1  
Old 06-19-2008
Mksysb and Savevg woes
hi,

i'm having a little trouble with an AIX 5.2 script that i have written and i was wondering if anyone could please offer me some advice on how to append a savevg backup to a mksysb tape, or more importantly where i'm going wrong? i've been trying to get this to work for about a month with no joy now.

here's a cut down version of my script:
Code:
MKSYSBLOG=/usr/tmp/mksysb.log
VGLOG=/usr/tmp/vg.log
MKSYSBVLOG=/usr/tmp/mksysbv.log
VGVLOG=/usr/tmp/vgv.log

tctl -f /dev/rmt0 rewind
/usr/bin/mksysb -ipX /dev/rmt0.1 2>$MKSYSBLOG
/usr/bin/savevg -ipXf /dev/rmt0 DEV_VG 2>$VGLOG
/usr/sbin/restore -s3 -Tqvf /dev/rmt0.1 2>$MKSYSBVLOG
/usr/sbin/restore -s1 -Tqvf /dev/rmt0.1 2>$VGVLOG
tctl -f /dev/rmt0 rewind

the problem that i am having is that if i run this script i get the following error from the restore commands:

restore: 0511-160 Cannot read the backup media
/dev/rmt0.1: There is an input or output error

with the tape rewound, if i run a restore -Tvqf /dev/rmt0 it lists the files in DEV_VG. this made me think that the tape was rewinding before running the savevg command for some reason.

if i change the backups to use the rmt0 device and manually do all my rewinding and fast forwarding with tctl i get the same errors as the restore command gives me.

if i run a /usr/bin/mksysb -ipX /dev/rmt0 then a restore -Tvqf /dev/rmt0 it lists the files in the rootvg. if i then run a tctl -f /dev/rmt0.1 fsf 1 i then receive the following error:

restore: 0511-262 Read an unexpected end of file.

from what i've read a mksysb should put the files on the 3rd segment of the backup, is this correct? my mksysb doesn't seem to follow the documented standard.

thanks in advance.

james.

edit: sorry for the double post. must have been caused by a timeout while editing my OP.
Last edited by boredazfcuk; 06-19-2008 at 08:45 AM..
# 2  
Old 06-19-2008
There is an AIX subforum here - post AIX issues there next time please.

Some years back I had to get some special files under /dev back, which did not come back from the restore of the mksysb automatically. Here is what I did. The text and comments are in german, but I am too lazy to translate it now Smilie You will see by the commands, what I did; hope it helps Smilie

Code:
Clonen von Rechnern:
====================

Sichern:
--------

- rootvg mit mksysb sichern >>> wichtig: Create Map files?  YES <<<
- Andere VGs (im Bsp. datavg) wie folgt sichern:

   savevg -imf /dev/rmt0 datavg

Restore:
--------

- mksysb zurücksichern
- Restore von /dev:

   cd /tmp
   [tctl -f /dev/rmt0 rewind		     #Band an Anfang spulen
   [chdev -l rmt0 -a block_size=512	     #Blockgröße für Streamer auf 512bytes
   [restore -s2 -xqdvf /dev/rmt0.1 ./blksize  #Blockgröße des mksysb-Tapes ermitteln
   [cat ./blksize
   chdev -l rmt0 -a block_size=xxx	     #Blockgröße die in 'blksize' steht setzen
   tctl -f /dev/rmt0 rewind
   restore -s4 -xqdvf /dev/rmt0.1 ./dev	     #/dev in /tmp/dev zurück
   find . -print | cpio -dmpv /dev	     #Kopieren von ./dev nach /dev ohne zu über-
					     #schreiben!
					     #Allerdings sollte diese nachträgl. zurück-
					     #gesicherten Devices auf Ihre Rechte über-
					     #prüft werden. Habe das Flag zum Bewahren
					     #der ursprünglichen Rechte nich gefunden.

- Andere VGs zurücksichern (Bsp.: datavg):

   exportvg datavg			     #Alte Files/Info der datavg löschen
   restvg -qf /dev/rmt0			     #Rücksichern der datavg ins System

- Anschließend den cfgmgr starten

# 3  
Old 06-26-2008
sorted!
hi,

i would have posted this in the aix forum but i'm a unix noob. thought it would have been more appropriate to post in here as i thought i was going to be referred to the man pages lol

i did manage to find the solution for myself and it definately wasn't an a dim operator error!

apparently there is a bug with my version of (AIX 5.2.003) and this issue was fixed in 5.2.004.

basically if the block_size of the tape device is set to 512 the mksysb rewinds itself after each writing phase and overwrites what it just saved. this meant that only the final phase of the backup was effectively being saved.

changing the block size of the tape device to 1024 solved my problem. i now have bootable backup tapes with a savevg appended.

thanks for your help,

james.
 
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Mksysb and Savevg woes

hi, i'm having a little trouble with an AIX 5.2 script that i have written and i was wondering if anyone could please offer me some advice on how to append a savevg backup to a mksysb tape, or more importantly where i'm going wrong? i've been trying to get this to work on and off for about a... (1 Reply)
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