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Topics: AIX, System Admin
Using FAST IPL only works on some RS6000 systems, like SP's or J/G/R30/40's.
To configure FAST IPL:
# mpcfg -cf 11 1Check current configuration:
# mpcfg -dfIf you can only use a terminal to configure the Fast IPL:
To find the status of the batteries of an SSA adapter, enter as root:
# ssa_fw_status -a ssaXX is the number of your adapter, for example:
# ssa_fw_status -a ssa0After installing a new battery, enter the following command:
Fast write cache size: 32
Expected battery life: 22000
Powered on hours: 20706
Battery state: Active
# ssa_format - l ssaX - bThis will reset the lifetime counter.
Topics: AIX, System Admin↑
A little script to rotate a log while not upsetting the process which is logging to the file. This script will copy and compress the log file, and then zero the log file out. Then the script will search for older log files and remove them after +3 days since last modification.
DATE=`date +%d%h-%I%p`
BASE_DIR='/var'
if [ -f $BASE_DIR/logname.log ]; then
cp $BASE_DIR/logname.log $BASE_DIR/logname.log.$DATE
> $BASE_DIR/logname.log
compress $BASE_DIR/logname.log.$DATE
fi
find $BASE_DIR -name 'logname.log.*' -a -mtime +3 -exec rm {} \;
Topics: AIX, System Admin↑
To retrieve a list of all recent commands:
# history -100This shows you the last 100 entries.
Topics: AIX, Backup & restore, System Admin↑
You can use a DVD-RAM to create a system backup. To do so, enter:
# smitty mkdvdThis works in AIX 5.2 and above.
To use a DVD-RAM for writing and reading like a file system, use the following commands. This will work only at AIX 5.2 and above:
# udfcreate -d /dev/cd0
# mount -V udfs /dev/cd0 /mntIf you get an error, ensure /etc/vfs contains this line (and retry the mount command after validating):
udfs 34 /sbin/helpers/udfmnthelp
If the lines in your text file are too long, you may want to word wrap them. In AIX this command is called fold:
# fold -sw 72 longfile > shortfileThis command will keep the longest line up to 72 characters and will not break a word in half. Without -w 72 lines will be wrapped to 80 characters.
To quickly show you the processor speed, cpu type, amount of memory and other system information, type:
# lsconfYou can also use prtconf.
Sometimes, when you create an mksysb, you receive an error like this one:
/dev/ipldevice not foundDevice /dev/ipldevice is a hard link to the disk your system booted from. Mksysb tries to determine the size of the boot logical volume with the bosboot -qad /dev/ipldevice command. Via lslv -m hd5 you can see from which disk was booted (or via bootlist -m normal -o).
# ln /dev/bootdevice /dev/ipldeviceFor example:
ln /dev/rhdisk0 /dev/ipldeviceNote: Use "rhdisk" and not "hdisk".
Topics: AIX, SSA, Storage, System Admin↑
If, for some reason, the pdisk and hdisk numbering of SSA disks is not sequential anymore, then there's a way to bring order in to chaos. Usually, the pdisk and hdisk numbering order are screwed up when you replace multiple disks together. Especially on HACMP clusters, a correct numbering of pdisks and hdisks on all nodes of the cluster, comes in handy.
Unmount all file systems on the specific disks, then varyoff the volume group:
# /usr/lib/methods/cfgssar -l ssarIf this doesn't help (it sometimes will), then renumber the disks manually:
# mkdev -p ssar -t scsd -c pdisk -s ssar -w [connection-ID] -l pdisk1Create the hdisks again:
# mkdev -p ssar -t hdisk -c disk -s ssar -w [connection-ID] -l hdisk3Test with:
# ssaxlate -l pdisk1if it shows hdisk3 (Usually the hdisk number is 2 higher than the pdisk number if you use 2 SCSI disks in the rootvg).
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