AIX: XtremIO: reserve conflicts
Summary: Creating host using mksysb and native drivers result in reserve conflicts after Dell EMC ODMs installed (boot from SAN)
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Symptoms
Host creation from mksysb without Dell EMC ODMs installed.
When creating LPAR using mksysb image with native drivers/no Dell EMC ODMs host uses AIX default single_path reserve policy.
These reserves fail to release and after the install of Dell EMC ODMs resulting in reserve conflicts.
Other symptoms are paths to rootvg (boot from SAN) going defined and the creation of new paths to same device.
When creating LPAR using mksysb image with native drivers/no Dell EMC ODMs host uses AIX default single_path reserve policy.
These reserves fail to release and after the install of Dell EMC ODMs resulting in reserve conflicts.
Other symptoms are paths to rootvg (boot from SAN) going defined and the creation of new paths to same device.
Cause
AIX native ODM definitions do not specify no_reserve and default to single_path.
The XIO array holds the reserve long enough that path discovery down other paths fail but further probing discovers them as new paths.
The original paths then go defined and half of the paths will return reserve conflicts.
The XIO array holds the reserve long enough that path discovery down other paths fail but further probing discovers them as new paths.
The original paths then go defined and half of the paths will return reserve conflicts.
Resolution
Verify reserve in use with 'devrsrv -c query -l hdiskXX' for all paths to lun.
Available paths will return ODM definition of no_reserve with actual reserve of single_path.
To clear this run 'devrsrv -c release -l hdiskXX' for all paths to lun.
Once cleared paths will no longer get single_path reserve placed.
Defined paths (stale data) can then be removed with rmdev -Rdl hdiskXX.
Available paths will return ODM definition of no_reserve with actual reserve of single_path.
To clear this run 'devrsrv -c release -l hdiskXX' for all paths to lun.
Once cleared paths will no longer get single_path reserve placed.
Defined paths (stale data) can then be removed with rmdev -Rdl hdiskXX.
Affected Products
PowerPath for AIXProducts
PowerPath for AIXArticle Properties
Article Number: 000064324
Article Type: Solution
Last Modified: 17 Oct 2025
Version: 4
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