IBM Power Ideas Portal
This portal is to open public enhancement requests against IBM Power Systems products, including IBM i. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (https://ideas.ibm.com).
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Welcome to the IBM Ideas Portal (https://www.ibm.com/ideas) - Use this site to find out additional information and details about the IBM Ideas process and statuses.
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ideasibm@us.ibm.com - Use this email to suggest enhancements to the Ideas process or request help from IBM for submitting your Ideas.
Added new options to importvg/exportvg to backup and restore lvmo tunables. This is delivered in AIX 7.2 TL 03.
exportvg [-b] - Backs up the performance tunable parameters of the volume group that are set with the lvmo command.
importvg [ -r file_name ] - Restores the performance tunable parameters of the volume group.
lvmo tunables are not maintained in LVM metadata because of following reasons:
- lvmo tunables may not same in all nodes . For example with PowerHA in an enhanced concurrent volume group, the passive node may not need the
same number of pbufs as the active node.
- There is no space in LVM on-disk metadata layout to save lvmo tunables.
A solution to migrate tunables with a volume group is to backup lvmo tunables before exporting the VG and to restore them after importing the VG. A sample script called ???lvmo_tool" is provided in IBM Developerworks to demonstrate this. The lvmo_tool can be found at
https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/Power%20Systems/page/LVMO%20tool%20for%20migrating%20LVM%20performance%20tuning%20values
An enhancement to backup and restore of lvmo tunables as part of the exportvg/importvg commands is under consideration for next year's AIX TL uddate. Note that all statements regarding IBM's future direction and intent represent goals and objectives only and are subject to change or withdrawal without notice.
We do not have space in VGDA to keep pv_pbuf_count.