AS/400 ASP%

225 pts.
AS/400 ASP
what is the default ASP% in AS/400 and what is the procedure to define our own.

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If your looking into defining a user ASP, that is done in DST accessed during an IPL. I would advise against it though as it no longer has the benefits it once did.
ASP1 is the system defined ASP.


By using WRKSYSSTS or DSPSYSSTS you will see the System ASP and the current ASP used.

What do you mean by “what is the procedure to define our own”
Please be more specific.


This seems like a homework question

If you mean to have multiple ASPs, yes you can have them. You can have system files and user files on different ASPs, however, it is hard to manage multiple ASPs. WRKSYSSTS displays all ASPs you have in your system.

When you create a disk pool using the New Disk Pool wizard availabile through Operations Navigator disk management functions , specify Type of disk pool as Basic or Independent. When you create an independent disk pool, a specific set of attributes are defined:

A user-defined name that is unique among the independent ASPs in the cluster. This is the name of the physical resource.
A unique number between 33 and 99 that the server uses to identify the independent ASP. This is the ASP number assigned by the system.
One or more disk units
In addition, the system will set an attribute so that the ASP will not be able to overflow. The inability to overflow ensures that the independent ASP will always be independent. Allowing overflow into the system ASP would prevent independent vary configuration processing or switching between systems.

Independent ASPs support user-defined file systems (UDFS) in the form of directories and stream files. You cannot store library objects in an independent ASP. When you create the independent ASP the system directs a default UDFS called qdefault.udfs to the independent ASP by specifying the path name: /dev/independent ASP-name/qdefault.udfs. You can create additional UDFS later if you wish.

If you are asking about setting the ASP threshold %, log into SST, take option 3, w/w disk units, then option 2, w/w disk config, then option 3, w/w asp threshold. The help didn’t tell me the default %, but I’m pretty sure it is 90%.

Just in case that’s what you were asking.

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  • WM
    Hey Ashish, I don't think there is a default ASP. The system or the admins defined this information. Also, if you want to defined your own area of ASP I suggest that you grab the admin manual and do some reading as any changes to the ASP can affect your sys performance. And guys, correct me if I'm wrong about this assumption.
    460 pointsBadges:
  • Lovemyi
    The default ASP is the one that is configured from the start and that is where the OS at least is maintained. The default ASP is the result of adding at least one disk unit to the system to load the LIC on before adding additional disk to either that ASP or another ASP. Unless you are really working to segregate the applications I would agree with the answers above, do not create separate ASPs as they serve little benefit and are a lot of additional work for no gain. The only real reason to use a separate ASP is for storing your journal receivers on in case you loose the other disks. Then all you do is fix the disk, reload the entire system and then you still have the journal receivers to apply journal changes to bring the system back to the last successful transaction if you journal all files. This will still take you at least 8 hours or more of down time to restore your entire system depending on the size of the system and the speed of the tape drive. With single level storage on the IBM i this is the real power of the system by letting the system manage disk storage and running in the default (or first) ASP is the best solution.
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