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Chris Gibson's AIX and PowerVM blog.
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Checking your queue depth with kdb.

cggibbo 270000TMUJ | | Comment (1) | Visits (41771)

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Just say you change the queue_depth on a hdisk with chdev –P . This updates the devices ODM information only, not its running configuration. The new value will take effect next time I reboot the system. So now I have a different queue_depth in the ODM compared to the devices current running config (in the kernel).   What if I forget that I’ve made this change to the ODM and forget to reboot the system for many months? Someone complains of an I/O performance issue....I check the queue_depths and find they appear to be set appropriately... [More]

Tags:  chris lsattr 7.1 chdev queue_depth aix odm -p kdb 6.1 gibson

nimadm - multibos error!?

cggibbo 270000TMUJ | | Comments (9) | Visits (22054)

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  I’ve been working with a customer recently on an issue with nimadm . They were attempting to migrate a system from AIX 5.3 to 7.1 using nimadm . The NIM client AIX level was 5.3 TL12 SP4 and the NIM master was running AIX 7.1 TL1 SP1.   lpar1 : / # oslevel -s 5300-12-04-1119   root@nim1 : / # oslevel -s 7100-01-01-1141   They were running the following nimadm command:   # nimadm -j nimadmvg -c lpar1 -s spotaix710101 -l lpp_sourceaix710101 -d hdisk1 -Y   The nimadm operation would always fail at phase 11:  ... [More]

Tags:  altinst_rootvg nimadm: client attention: cloning error returned multibos 6 unexpected init_multibos() 11 7.1 phase alt_disk_copy: nimadm on result an .1 0505-218 5.3 aix 0505-187
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