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Replicated rootvg, ghostdev and NPIV
My team and I have recently
been trying to stream line our AIX disaster recovery process. We’ve been
looking for ways to reduce our overall recovery time. Several ideas were tossed
around such as a) using a standby DR LPAR with AIX already installed and using
rsync/scp to keep the Prod & DR LPARs in sync and b) using alt_disk_copy
(with the –O flag for a device reset) to clone rootvg to an alternate disk
which is then replicated to DR. These methods may work but are cumbersome to
administer and (in the case of alt_disk_copy) require... [More]
Tags:  chris hds recovery led rootvg fc support ghostdev replication lpar hung gibson 554 boot replicated chris_gibson vfc vsp aix san channel virtual fibre dr disaster npiv hang |
In a perfect world....rootvg would always reside on hdisk0.
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 |
My root volume group is called old_rootvg....HELP!!
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 |
Online quorum change |
Restoring a Versioned WPAR with NIM
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 |
Experience with RootVG WPARs
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 |
AIX WPAR tips and tricks
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 rootvg failure monitoring
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 |