In a perfect world, 99.9% of AIX administrators would prefer their systems to look like this:   # lspv | grep rootvg hdisk0          00c342c68dfcbdfb                     rootvg           active   However, in reality, 99.9% of AIX administrators live with systems that look something like this:   # lspv | grep rootvg hdisk39... [More]

Tags:  hdisk0 chris_gibson rendev rootvg aix

So, your root volume group is called old_rootvg not rootvg?   Wait……what!?   aixlpar1 : # lspv hdisk0           00c342c68dfcbdfb              old_rootvg       active   < This is BAD! hdisk1           00c342c6161c6b47              appvg            active   How did you end up in this situation? Did you reinstall AIX with some strange incantation or did some alternate disk activity go horribly wrong? Not sure? Me neither!   Fortunately the following tech-note and associated script can help.  ... [More]

Tags:  aix importvg old_rootvg chris_gibson synclvodm rootvg odmdelete

For those who weren't aware.....starting with AIX 5.3 TL7, quorum changes are allowed online without having to varyoff and varyon the volume group. This also means no reboot is required when changing quorum for rootvg. Of course this also applies to AIX 6.1.

Tags:  rootvg aix mirror quorum

I was contacted recently by a customer who was attempting to restore an AIX 5.3 Versioned WPAR (VWPAR) from backup using NIM. The restore worked OK but the data was restored to the wrong volume group!   When the VWPAR was created, the –g option was specified with mkwpar to force the creation of the VWPAR file systems in a separate volume group (named wparvg) rather than the default location of the Global root volume group (rootvg).   # mkwpar - g wparvg -n p8vw2 -B /cg/53gibbo.mksysb  -C -O   Running lsvg against... [More]

Tags:  vwpar gibson chris iv68299 blog wpar mkwpar aix restore volume wparvg group rootvg nim

I finally got access to a system where I could test RootVG WPARs a little more extensively than I have in the past.   If you are not sure what a RootVG WPAR is then I suggest you take a look at the following IBM documentation:   http://publib.boulder.ibm.com/infocenter/aix/v6r1/topic/com.ibm.aix.wpar/rootvg-wpars.htm   I performed the following test today, just to prove a theory. The result was interesting, so I thought I would share it with you on my blog.   First, I started with an AIX 7.1 (7100-00-01-1037) system that had one spare vscsi... [More]

Tags:  chris rootvg gibson aix workload partitions wpars

Here’s some handy tips and tricks for managing WPARs in your AIX environment.   How to share a global file system with a WPAR.   - In the Global.   root@750lpar11]/ # uname -W 0   - Global File System that you want to share with the WPAR (750wpar2).   [root@750lpar11]/ # df -g /cg Filesystem    GB blocks      Free %Used    Iused %Iused Mounted on /dev/cglv          1.98      0.30  ... [More]

Tags:  chris tricks namefs gibson partition tips rootvg vwpar woroload wpar migrate aix versioned

AIX has a new “critical volume group” capability which will monitor for the loss or failure of a volume group. You can apply this to any volume group, including rootvg. If applied to rootvg, then you can monitor for the loss of the root volume group.   This feature may be useful if your AIX LPAR experiences a loss of SAN connectivity e.g. total loss of access to SAN storage and/or all SAN switches. Typically, when this happens, AIX will continue to run, in memory for a period of time and will not immediately crash. Often you... [More]

Tags:  failure aix gibson chris monitoring vg volume group critical cgaix chvg rootvg