• Share
  • ?
  • Profiles ▼
  • Communities ▼
  • Apps ▼

Blogs

  • My Blogs
  • Public Blogs
  • My Updates

AIX Down Under

  • Log in to participate

About this blog

Anthony English is an independent contractor who solves expensive problems for businesses running IBM Power Systems. He has written extensively about AIX and has been recognised for his contributions and thought leadership by being named an IBM Champion for Power Systems.
  • Facebook
  • Twitter
  • Google
  • LinkedIn
  • RSS

Archive

  • December 2016
  • April 2016
  • November 2015
  • October 2015
  • September 2015
  • August 2015
  • July 2015
  • December 2013
  • November 2013
  • June 2013
  • March 2013
  • February 2013
  • January 2013
  • December 2012
  • November 2012
  • October 2012
  • September 2012
  • August 2012
  • July 2012
  • June 2012
  • April 2012
  • March 2012
  • February 2012
  • January 2012
  • December 2011
  • November 2011
  • October 2011
  • September 2011
  • August 2011
  • July 2011
  • June 2011
  • May 2011
  • April 2011
  • March 2011
  • February 2011
  • January 2011
  • December 2010
  • November 2010
  • October 2010
  • September 2010
  • August 2010
  • July 2010
  • June 2010
  • May 2010

Tags

Find us on Facebook

Posts by date
  • Sort by:
  • Date ▼
  • Title
  • Likes
  • Comments
  • Views

Novel uses for Name File Systems

AnthonyEnglish 270000RKFN | | Visits (6025)

Tweet
You may know that WPARs use Name File Systems for creating alternate paths for rootvg file systems. Name File Systems have been around in AIX forever, and when you think about it, they can come in handy when you want to create a second view of a subdirectory. A Name File System is a pseudo-file system - a way of making a subdirectory its own dedicated mount with its own mount attributes such as cio, read-only etc.   Even if you don't use Name File Systems for that, here are some ideas of where an alternate path can be helpful. This is from my... [More]

Tags:  file-over-file_mount namefs mount poweritpro

efix available for HMC / SDMC Save Corruption Exposure

AnthonyEnglish 270000RKFN | | Comments (2) | Visits (8534)

Tweet
Following up on yesterday's post about HMC and SDMC code losing partition profiles , there's an efix available MH01263. This affects you if your HMC is running V7R7.3.0. From the efix README : This package includes the following fixes: Fixed a problem where managed systems lose profiles and profiles get corrupted resulting in Recovery state which prevent the ability to do DLPAR/LPM. Fixed a security vulnerability with the HMC help content. You should be able to obtain this efix from the IBM Support Portal , or try:... [More]

Tags:  hmc sdmc

Updated: HMC / SDMC Save Corruption Exposure

AnthonyEnglish 270000RKFN | | Visits (7941)

Tweet
Update: there's an efix available for the HMC. For further details see this post . I received this notice today, which is very important if you're running HMC V7R7.3.0 or SDMC V6R7.3.0. The gist of it is that you could lose your partition profile data, so if you're already running these versions of the HMC or SDMC, you must backup your profile data  and wait for a fix. And if you're on an older release of the HMC or SDMC, don't upgrade to these versions until a fix is released.  I've included some links to the commands referred to in this... [More]

Tags:  sdmc hmc

Storage Parameters for MPIO on AIX

AnthonyEnglish 270000RKFN | | Visits (13344)

Tweet
I came across this table in the Redbook Best Practices for DB2 on AIX 6.1 for POWER System . It shows a list of the common parameters you need to look at for disks when they are connecting to a SAN. Tasks Actions to undertake Remarks For details see LUN creation on SAN storage box Create LUN in particular RAID level Divide LUN into desired capacity Map to host group LUN creation on SAN storage box Disks and HBA parameters Disks parameters: algorithm=round_robin hcheck_interval=20 max_transfer= reserve_policy=no_reserve ... [More]

Tags:  attributes db2 storage san hcheck_interval hdisk max_transfer num_cmd_elems max_xfer_size tuning hba

PP spreading and LV striping for Oracle

AnthonyEnglish 270000RKFN | | Comments (3) | Visits (28011)

Tweet
An IBM Oracle Technical Brief came out in May entitled Oracle Architecture and Tuning on AIX . There's a lot in it, but the good news is that if you're working on an AIX system that was a fresh install of AIX 6.1 or 7.1, then on the whole the default tuning parameters are what you need. If you're still on AIX 5.3, or if your system was migrated from AIX 5.3 to 6.1 to 7.1, you may need to revisit the tuning parameters. Do it anyway, if you can. There are two items which caught my eye especially from this Oracle Technical Brief: Logical Volume... [More]

Tags:  lv pp reorgvg agblksize disk_layout lvm tuning redo_logs striping performance oracle

Could a vanilla VIOS installation be simplified?

AnthonyEnglish 270000RKFN | | Visits (12126)

Tweet
If only a VIO server could be a VSCSI client ... A vanilla installation of the VIO server is very easy - once you can get the LPAR to access the installation files. But that's the part which can be unnecessarily cumbersome and time consuming. Sure, you can use a physical Virtual I/O server installation DVD, but that means getting the DVD to a data centre - and probably you with it. Now if you're in a lab setting, or have a data centre across the floor from where you sit, that may not be any issue at all. But for many of us, getting into... [More]

Tags:  virtual_media_repository hmc installios install vscsi vios virtual_io_server virtual_media_library vanilla

Recover root password and VIO server (padmin) password

AnthonyEnglish 270000RKFN | | Visits (29178)

Tweet
If you're unfortunate enough to lose the root password on an AIX host, there is a way of recovering it . You can also recover the padmin password in VIOS if you've lost it. Basically, it's a matter of booting from AIX or VIOS installation media and stepping through the System Maintenance menus. When you do that, the boot file systems come from the installation media, and then you import the rootvg volume group which is on the original disks (the one with the unknown password). At that point you can run the passwd command or edit /etc/passwd.  ... [More]

Tags:  aix padmin password root
  • Show:
  • 10
  • 20
  • 30
  • Previous
  • Next
1