setting default PP size


 
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Operating Systems AIX setting default PP size
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Old 06-21-2009
Is there a way to increase the PP Size of a volume group say rootvg ?

non-rootvg could be done by taking backup--- delete VG -- Create new VG with new PP SIZE and restore DATA...

But for ROOTVG anything in AIX 6 ?

Another weird thing:

I installed AIX 6 on two different LPARs -- each disk size was 50GB
On One LPAR PP SIZE became 64MB and on the other it became 32MB
This was direct installation from CD ( not via NIM )

references:
Storage Management in AIX 5L Version 5.3

IBM: AIX - Problems with extendvg rootvg hdisk1
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MTRR_ADD(9)							Hardware Interfaces						       MTRR_ADD(9)

NAME
mtrr_add - Add a memory type region SYNOPSIS
int mtrr_add(unsigned long base, unsigned long size, unsigned int type, bool increment); ARGUMENTS
base Physical base address of region size Physical size of region type Type of MTRR desired increment If this is true do usage counting on the region DESCRIPTION
Memory type region registers control the caching on newer Intel and non Intel processors. This function allows drivers to request an MTRR is added. The details and hardware specifics of each processor's implementation are hidden from the caller, but nevertheless the caller should expect to need to provide a power of two size on an equivalent power of two boundary. If the region cannot be added either because all regions are in use or the CPU cannot support it a negative value is returned. On success the register number for this entry is returned, but should be treated as a cookie only. On a multiprocessor machine the changes are made to all processors. This is required on x86 by the Intel processors. The available types are MTRR_TYPE_UNCACHABLE - No caching MTRR_TYPE_WRBACK - Write data back in bursts whenever MTRR_TYPE_WRCOMB - Write data back soon but allow bursts MTRR_TYPE_WRTHROUGH - Cache reads but not writes BUGS
Needs a quiet flag for the cases where drivers do not mind failures and do not wish system log messages to be sent. COPYRIGHT
Kernel Hackers Manual 2.6. July 2010 MTRR_ADD(9)