stop-start sendmail on AIX

1. Verify if sendmail is running. “ps -ef | grep sendmail“.
2. Stop sendmail. “stopsrc -s sendmail”
3. Verify if sendmail is running. “ps -ef | grep sendmail“.
No process should be returned.
4. Start sendmail. “startsrc -s sendmail -a “-bd -q30m”“.
-bd will start the sendmail as a SMTP mail relay router.
-q will the the interval in which the sendmail daemon will process save messages. If none is provided the daemon will default to instant processing.
5. Verify if sendmail is running. “ps -ef | grep sendmail“.

Howtodo remove disk from mirror AIX

before remove you must unmirror (detatch)
#unmirrorvg vg-name hdisk-no

then remove disk from volumegroup
#reducevg vg-name hdisk-no

and delete hdisk-no
#rmdev -dl hdisk-no
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How to change kernel from 32 to 64 bit on AIX

if your IBMserver is 64 bit but it run at 32 bit
it can mount filesystem max 1 TB
if you want to use filesystem larger than 1 TB you can change kernel to 64 bit
1. Ensure currently kernel is running as 32 bit.
# bootinfo -K
32

2. Run these commands. Require system reboot, so let customer stop all applications first.
# ln -sf /usr/lib/boot/unix_64 /unix
# ln -sf /usr/lib/boot/unix_64 /usr/lib/boot/unix
# bosboot -ad /dev/ipldevice (ipldevice is hdiskx which is the boot disk)
# bootlist -om normal (list bootdevice)
# bosboot -ad /dev/hdisk0 or /dev/hdisk1
# shutdown -Fr

3. After reboot, verify kernel run as 64 bit.
# bootinfo -K
64

If we want to change back kernel from 64 to 32 bit. Use all steps above, but change the commands at step2.
# ln -sf /usr/lib/boot/unix_mp /unix
# ln -sf /usr/lib/boot/unix_mp /usr/lib/boot/unix
# bosboot -ad /dev/ipldevice (ipldevice is hdiskx which is the boot disk)
# shutdown -Fr