JFS2 logging disabled during mksysb restore.While attending the IBM Power Systems Symposium this week, I learnt that starting with AIX 7.1 (and AIX 6.1 TL6) JFS2 logging is disabled during a mksysb restore. You may be familiar with disabling JFS2 logs, if not, take a look at this IBM technical note:
http
I’ve been unable to find any official
documentation from IBM that mentions this new enhancement to the mksysb restore
process. However, when I checked my own AIX 7.1 system I found the following
statement/code in the /usr
# Disable jfs2 logs for temp mounts -- (def#751604 performance) if [[ "$2" = "TRUE" ]]; then mount -v $LVTYPE -o log=NULL,nomanager /dev/$LV $MROOT$FS || $ERROR else mount
-v $LVTYPE -o log= fi
If I compare this against my AIX 5.3 system, I don’t find any reference to this enhancement.
AIX 7.1: [/usr/lpp/bosinst] > oslevel -s 7100-00-03-1115 [/usr/lpp/bosinst] # grep log=NULL bi_main bi_main: mount -v $LVTYPE -o log=NULL,nomanager /dev/$LV $MROOT$FS || $ERROR
AIX 5.3: [/usr/lpp/bosinst] > oslevel -s 5300-11-03-1013 [/usr/lpp/bosinst] # grep log=NULL bi_main [/usr/lpp/bosinst] #
This change is clever. I mean why would we ever need JFS2 logging during a restore? By disabling logging, the restore process will be faster. Simple, really. |