ASM shows abnormal I/O response time

Hi,
We have a two node RAC on AIX 5.3-TL10 running Oracle 11.1.0.7
We have had a huge I/O problem today, with the storage on ASM
The ASM instance consists of 9 x 16Gb disks for Data diskgroup and 3x16Gb for Recovery Area diskgroup.
Both diskgroups use external redundancy.
All disks are on SAN storage
Now the question:
We see in the disk stats the following:
INSTNAME    GN  DN        READS       WRITES RERRS WERRS       BYTES_READ    BYTES_WRITTEN READ_TIME/READS WRITE_TIME/WRITES
WCSPRD2      1   0    4,471,632    1,067,564     0     0  165,201,409,536   30,609,315,328   .061899937552 <==    .057094084241
WCSPRD2      1   1    4,531,860    1,196,263     0     0  164,387,738,112   32,506,625,536   .029503535890     .053256503317
WCSPRD2      1   2    4,559,730    1,163,303     0     0  164,523,316,224   31,543,020,544   .022800459600     .045446761477
WCSPRD2      1   3    4,585,842    1,178,201     0     0  164,725,525,504   32,636,038,144   .064802255800 <==    .057945133663
WCSPRD2      1   4    6,405,113    1,159,063     0     0  195,604,026,368   32,158,811,136   .022066317789     .052220315111
WCSPRD2      1   5    5,322,150    1,127,490     0     0  175,831,556,608   31,319,253,504   .020443702659     .042821491187
WCSPRD2      1   6    4,464,782    1,074,408     0     0  155,865,391,104   28,310,427,136   .031281829331     .049956605704
WCSPRD2      1   7    4,456,535      972,670     0     0  158,696,644,608   26,818,985,984   .031853965462     .048030197598
WCSPRD2      1   8    5,599,789    1,195,371     0     0  172,564,756,480   28,008,355,840   .024652429429     .042036854716
WCSPRD2      2   0      135,027    1,667,660     0     0    2,198,231,552   86,954,245,120   .001943523036     .019420785309
WCSPRD2      2   1        1,811    1,340,450     0     0        1,285,632   81,578,938,880   .008952528437     .020978272570
WCSPRD2      2   2          910    1,340,922     0     0          727,040   81,626,418,688   .003186924176     .016962261022Can anyone of you guru's explain the abnormal average readtimes for DN 0 and 3 in GN 1, being 61.8 and 64.8 ms versus an average of around 25ms of the other disks.
Any input is appreciated.
Thanks
Frank-Jan

Hi,
Here they are:
Tablespace IO Stats                 DB/Inst: WCSPRD/WCSPRD2  Snaps: 4737-4738
-> ordered by IOs (Reads + Writes) desc
Tablespace
                 Av      Av     Av                       Av     Buffer Av Buf
         Reads Reads/s Rd(ms) Blks/Rd       Writes Writes/s      Waits Wt(ms)
WCTBLSPC
       275,855      77  116.1     1.5       26,064        7      3,183  217.4
SYSAUX
         2,127       1  141.3     1.3          911        0          0    0.0
TEMP
         1,194       0   23.7     7.2          941        0          0    0.0
SYSTEM
         2,002       1  230.3     1.8          127        0          0    0.0
UNDOTBS2
             5       0    8.0     1.0        1,499        0         16  141.9
UNDOTBS1
             3       0    6.7     1.0            1        0         83    1.6
USERS
             1       0  140.0     1.0            1        0          0    0.0
WCS_KRG
             1       0    0.0     1.0            1        0          0    0.0
File IO Stats                       DB/Inst: WCSPRD/WCSPRD2  Snaps: 4737-4738
-> ordered by Tablespace, File
Tablespace               Filename
                 Av      Av     Av                       Av     Buffer Av Buf
         Reads Reads/s Rd(ms) Blks/Rd       Writes Writes/s      Waits Wt(ms)
SYSAUX                   +DB01/wcsprd/datafile/sysaux.338.715000059
         2,127       1  141.3     1.3          911        0          0    0.0
SYSTEM                   +DB01/wcsprd/datafile/system.1070.715000059
         2,002       1  230.3     1.8          127        0          0    0.0
TEMP                     +DB01/wcsprd/tempfile/temp.1073.715000187
         1,194       0   23.7     7.2          941        0          0    N/A
UNDOTBS1                 +DB01/wcsprd/datafile/undotbs1.1072.715000061
             3       0    6.7     1.0            1        0         83    1.6
UNDOTBS2                 +DB01/wcsprd/datafile/undotbs2.1067.715000389
             5       0    8.0     1.0        1,499        0         16  141.9
USERS                    +DB01/wcsprd/datafile/users.257.715000061
             1       0  140.0     1.0            1        0          0    0.0
WCS_KRG                  +DB01/wcsprd/datafile/wcs_krg.1058.715087247
             1       0    0.0     1.0            1        0          0    0.0
WCTBLSPC                 +DB01/wcsprd/datafile/wctblspc.1052.715780877
        75,215      21  126.1     1.5        6,476        2        554   77.2
WCTBLSPC                 +DB01/wcsprd/datafile/wctblspc.1053.715856291
        67,247      19  112.5     1.5        5,989        2        680  363.7
WCTBLSPC                 +DB01/wcsprd/datafile/wctblspc.1054.715856293
        62,907      18  104.6     1.6        7,417        2        706  161.2
WCTBLSPC                 +DB01/wcsprd/datafile/wctblspc.1057.715087269
        70,486      20  119.1     1.3        6,182        2      1,243  231.8I can't see anything special here. The WCTBLSPC contains our Webshop data, and is accessed most frequently.
What bothers me is that ASM data should be striped.
If that would be completely true, then why are especially two disks very busy. It looks as is these two disks contain the most recent data of the Tablespace and striping is not completely spread across all 9 disks
I'm very curious for your findings.
Thanks
FJFranken

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    Hello Srinath,
    Thank you for participating in the Small Business support community. My name is Nico Muselle from Cisco Sofia SBSC.
    The response time from the switch could be considered as quite normal. Reason for this is that the switch gives CPU priority to it's actual duties which would of course be switching, access lists, VLANs, QoS, multicast and DHCP snooping etc etc. As a result of that, ping response times of the switch itself do not show in any way the correct working of the switch.
    I invite you to try pinging clients connected to the switch, you should be able to notice that response times to the clients are a lot lower than response times of the switch itself.
    Hope this answers your question !
    Best regards,
    Nico Muselle
    Sr. Network Engineer - CCNA - CCNA Security

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