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  1. #1
    Join Date
    Jul 2011
    Posts
    29

    Unanswered: DB2 9.1 AIX (Physical/Virtual/Page Ram)

    I'm having issues understanding the difference/relationship with the above three.

    Below are stats in regards to the commands I've run on our DEV LPAR:

    LPAR1]lsattr -El mem0

    goodsize 21504 Amount of usable physical memory in Mbytes False
    size 21504 Total amount of physical memory in Mbytes False

    LPAR1]vmstat -v

    5505024 memory pages
    5222144 lruable pages
    43970 free pages
    2 memory pools
    1198905 pinned pages
    80.0 maxpin percentage
    10.0 minperm percentage
    90.0 maxperm percentage
    28.1 numperm percentage
    1471852 file pages
    0.0 compressed percentage
    0 compressed pages
    27.9 numclient percentage
    90.0 maxclient percentage
    1457157 client pages
    0 remote pageouts scheduled
    180368 pending disk I/Os blocked with no pbuf
    171931 paging space I/Os blocked with no psbuf
    1972 filesystem I/Os blocked with no fsbuf
    166990 client filesystem I/Os blocked with no fsbuf
    90201 external pager filesystem I/Os blocked with no fsbuf
    0 Virtualized Partition Memory Page Faults
    0.00 Time resolving virtualized partition memory page faults

    LPAR1]TOPAS


    PAGING MEMORY
    en2 3.7 3.5 1.5 2.6 1.1 Faults 3994 Real,MB 21504
    Steals 0 % Comp 73
    Disk Busy% KBPS TPS KB-Read KB-Writ PgspIn 0 % Noncomp 25
    hdisk3 1.0 476.0 45.0 2.0 474.0 PgspOut 0 % Client 24
    hdisk0 0.0 104.0 24.0 2.0 102.0 PageIn 1
    hdisk6 0.0 10.0 2.0 0.0 10.0 PageOut 126 PAGING SPACE
    hdisk1 0.0 8.0 1.0 0.0 8.0 Sios 57 Size,MB 20800
    hdisk4 0.0 4.0 1.0 0.0 4.0 % Used 21
    hdisk5 0.0 2.0 0.0 0.0 2.0 NFS (calls/sec) % Free 79

    LPAR1]lsps -a

    Page Space Physical Volume Volume Group Size %Used Active Auto Type
    paging02 hdisk9 trunsunion 3200MB 35 yes yes lv
    paging01 hdisk9 trunsunion 3200MB 35 yes yes lv
    paging00 hdisk9 trunsunion 3200MB 35 yes yes lv
    hd6 hdisk0 rootvg 11200MB 10 yes yes lv

    LPAR1]svmon -G
    size inuse free pin virtual
    memory 5505024 5458476 46548 1199212 4826091
    pg space 5324800 1136628

    work pers clnt other
    pin 991196 0 0 208016
    in use 4023995 93736 1340745

    PageSize PoolSize inuse pgsp pin virtual
    s 4 KB - 3500924 1050452 1078540 2793435
    m 64 KB - 122347 5386 7542 127041

    From this, I can confirm that 21GB's of physcial RAM have been allocated to our dev LPAR.

    From what I understand, when the physcial RAM becomes full, older processes are removed from the RAM and placed in the pg space so that new processes can run in the RAM. Where does virtual RAM come in and what do my virtual #'s represent?

    Also, how much has been allocated to my page swap space? Is it 12000MB as shown in the lsps -a or is it abstracted from the svmon -G command?

    Thanks,
    Last edited by sanchez786; 07-20-11 at 13:17.

  2. #2
    Join Date
    Jun 2003
    Location
    Toronto, Canada
    Posts
    5,516
    Provided Answers: 1
    ---Deleted duplicate post---
    Last edited by n_i; 07-20-11 at 14:25.

  3. #3
    Join Date
    Jun 2003
    Location
    Toronto, Canada
    Posts
    5,516
    Provided Answers: 1
    Not sure why you have put "DB2" in the subject... All partition memory is virtual. VMM (virtual memory manager) will use real memory where possible and satisfy additional demand by paging stuff out.

    lsps shows the total available paging space; svmon shows how much is currently used.

    Google for "AIX information center" - you will find all details there.

  4. #4
    Join Date
    Aug 2008
    Location
    Toronto, Canada
    Posts
    2,368
    Quote Originally Posted by sanchez786 View Post
    Also, how much has been allocated to my page swap space? Is it 12000MB as shown in the lsps -a or is it abstracted from the svmon -G command?

    Based on lsps, svmon and topas output:

    paging space (total) = 20800MB
    paging space (used) = ~4439MB or ~21%

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