Stephen Diwell

AIX & Power Systems Lead Engineer at CBA. These are my personal opinions and comments.

[Stephen Diwell @CapacityReports]

@robmcnelly Sorry, I missed it i in IBMi. Apologies, don’t know about that.

[Stephen Diwell @CapacityReports]

@robmcnelly Yes it is. https://t.co/Cs8B8ItJ2Y

[Stephen Diwell @CapacityReports]

@heyrman_peter Hi Peter,
I get this error from the blog. You do not have permission to view this blog post

[Stephen Diwell @CapacityReports]

@Achilles0 @Achilles0
Correct, you can't use the mount command if the FS is not mounted. In this case, you can just use chfs to change the options and then mount FS.

[Stephen Diwell @CapacityReports]

#AIX #NIM Server Tuning Tip
mount -o remount,rw,rbrw,noatime /nim/mksysb
chfs -a options=rw,rbrw,noatime /nim/mksysb

[Stephen Diwell @CapacityReports]

And you may need to update the /etc/mail/submit.cf file too.

[Stephen Diwell @CapacityReports]

Migrating #AIX to 7.2 TL4 - Be aware that sendmail has changed. Non-root users may not be able to send mail.
If you edit privcmds file, you need to run setkst after to update the kernel security tables.
https://t.co/o4TacjCxYc

#IBMChampion

[Stephen Diwell @CapacityReports]

@megabreit @The_Iron_Monger @jaquilynch @JoeAIXvug Other things to consider for VIOS:
1 - It still uses crypt for passwords, change this to something stronger.
2 - You should delete and re-create all the ssh host keys in /etc/ssh after a fresh install.

#IBMChampion

[Stephen Diwell @CapacityReports]

@megabreit @The_Iron_Monger @jaquilynch @JoeAIXvug I told IBM on the 3rd June 2016 about this - my RFE is still pending.
https://t.co/WAg7w8SdDi

#IBMChampion

[Stephen Diwell @CapacityReports]

@The_Iron_Monger @jaquilynch @JoeAIXvug The oem_setup_env command place the padmin user in a non-restricted UNIX root shell and in that case IBM will not troubleshoot any problems resulting from using that shell out of it's main purpose which was created to allow installation of vendor software, such as device drivers.

[Stephen Diwell @CapacityReports]

@The_Iron_Monger @jaquilynch @JoeAIXvug It should be made clear to people that IBM will not support any scripts or issue that arrise when using the oem_setup_env for anything other than software driver installs.

#IBMChampion

[Stephen Diwell @CapacityReports]

The #PowerHA and #AIX related fixes reference site has moved, new link:
https://t.co/AbuygBZ9aG

#IBMChampion

[Stephen Diwell @CapacityReports]

@The_Iron_Monger Also note that where possible, the Hypervisor will allocate cores from the chips closest to the slots that contain the LPAR/VIOS adapters.
#IBMChampion

[Stephen Diwell @CapacityReports]

@CPetersen_CS @robmcnelly VLAN data is from the LPAR Profile:

lssyscfg -r prof -m ${CEC} --filter profile_names=${LPAR_PROFILE},lpa
r_names=${LPAR} -F lpar_name,virtual_eth_adapters

#IBMChampion

[Stephen Diwell @CapacityReports]

@IBM @POWER @RPerf
Found this great Excel document full of rperf values for almost all POWER and previous p systems.
https://t.co/e6ASVqJCi8

[Stephen Diwell @CapacityReports]

@cgibbo @cgibbo @aklyachkin

You would probably be better tuning the ioo options for JFS2 dirty pages, at least you can target sequencial or random writes.
j2_syncByVFS
j2_syncConcurrency
j2_syncPageCount
j2_nPagesPerWriteBehindCluster
j2_maxRandomWrite
j2_nRandomCluster

[Stephen Diwell @CapacityReports]

@cgibbo PowerHA 7.2 also puts duplicate lines in /etc/snmpdv3.conf
for smux 1.3.6.1.4.1.2.3.1.2.1.5 clsmuxpd_password

Support have not generated the APAR number yet.

[Stephen Diwell @CapacityReports]

@POWERHAguy According to these, memory leaks fixed in those SP's.
https://t.co/7WPHkaXF49
https://t.co/9JvdcX5N7B

Plus, the false FFDC's fixed in 7.2.2.SP3.
https://t.co/GWdl1AeDVv

[Stephen Diwell @CapacityReports]

Security enhancement to #AIX LDAP implementation needed to avoid users getting system privileged group access. Add your vote to my RFE.
https://t.co/2ExVxvYmBe

@cgibbo

[Stephen Diwell @CapacityReports]

Anybody else seeing this error from PHA clcycle command?
I see it at PHA 7.2.2 SP2, any other 7.2.2 levels affected?

# clcycle
The cluster log entry for clxd.log could not be found in the HACMPlogs ODM.

@POWERHAguy