System commands - disk access

To emulate the "clrscr" command (from C), I am determining the name of the OS and then passing the appropriate command to the Runtime object:
if ((menu.osName.lastIndexOf("sun") != -1) || (menu.osName.lastIndexOf("inux") != -1))
  System.out.println("This is an unix terminal");
  menu.clearCommand = "/usr/bin/clear";
else if (menu.osName.lastIndexOf("indow") != -1)
  System.out.println("This is a Windows MS-DOS terminal");
  menu.clearCommand = "C:\\Windows\\Command\\cls";
else if (menu.osName.lastIndexOf("dos") != -1)
  System.out.println("This is a MS-DOS terminal");
  menu.clearCommand = "C:\\DOS\\cls";
try
  menu.cls = Runtime.getRuntime().exec(menu.clearCommand);
  menu.cls.waitFor();
  menu.clsOut = new BufferedReader(new InputStreamReader(menu.cls.getInputStream()));
  while (menu.clsOut.ready())
    System.out.println(menu.clsOut.readLine());
  menu.clsOut.close();
catch (Exception e)
-However, I also want to make sure that the system command is not an alias for a malicious script, in terms of invoking any sort of IO (delete/create files, etc.). Is it possible to have some sort of wrapper mechanism around the execution of the system command to detect and catch any attempt to perform IO? So far, my application works as the code speaks out, but I am worried that the system command may not be what I expect.
Thanks.
--Ashwin                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

What about making the information you need to clear the screen a part of the installation?
You do
clear >myclear.out
cls >myclear.out
or whatever and use the contents of the "clear screen" file from your Java program.
Caveat however: under Unix you can have different types of terminal with different clear-screen sequences.
Sometimes I ponder to make a request for a curses-like java package to give an API for such (more advanced, but still CUI-related) things. Or maybe there is such without my knowing it?

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  • [SOLVED] Long time with excessive disk access before system reboot.

    I feel I would be grateful for some help here. It's my first go at Arch Linux having used Xubuntu for several years. It may be I'm missing something obvious but then I would be happy if someone could point me in the right direction.
    Problem: When I do a system restart by issuing
    $ systemctl reboot
    I get the following output
    Sending SIGTERM to remaining processes...
    Sending SIGKILL to remaining processes...
    Unmounting file systems.
    Unmounted /sys/kernel/debug.
    Unmounted /dev/hugepages.
    Unmounted /dev/mqueue.
    Not all file systems unmounted, 1 left.
    Disabling swaps.
    Detaching loop devices.
    Detaching DM devices.
    Unmounting file systems.
    Not all file systems unmounted, 1 left.
    Cannot finalize remaining filesystems and devices, giving up.
    Successfully changed into root pivot.
    Unmounting all devices.
    Detaching loop devices.
    Diassembling stacked devices.
    mdadm: stopped /dev/md126
    [ 1654.867177] Restarting system.
    However, after the last line is printed, the system does not reboot immediately but hangs for about 2 minutes with heavy disk activity. I can't say if it is read or write or both, but the led of my HDD is lit constantly. When this activity stops, the machine reboots.
    $ systemctl poweroff
    works as expected, i.e. shuts down immediately without excessive disk access.
    I see this behaviour both with the installed Arch system and when I run the live installation/recovery CD. It is also the same if I boot into the busybox rescue shell and then restarts the machine from there. It also does not seem to matter if any partition on the disk is is mounted or not, the behaviour is always the same with 2 min. heavy activity before reboot.
    System setup:
    Sony Vaio VPZ13. Intel Core i5 M460, 4GB ram, 2x64GB SSD in RAID0 configuration via bios setting (a.k.a. fake raid), partitioned like:
    windows boot
    windows system
    linux swap
    linux "/"
    linux "/home"
    So it's a dual boot setup with Windows 7.
    The raid array is assembled by mdadm, and I have mdadm_udev among my mkinitcpio.conf hooks (after blocks but before filesystems).
    Snip from journalctl log showing actions when reboot has been issued:
    jan 18 12:24:23 wione systemd[1]: Stopping Sound Card.
    jan 18 12:24:23 wione systemd[1]: Stopped target Sound Card.
    jan 18 12:24:23 wione systemd[1]: Stopping Bluetooth.
    jan 18 12:24:23 wione systemd[1]: Stopped target Bluetooth.
    jan 18 12:24:23 wione systemd[1]: Stopping Graphical Interface.
    jan 18 12:24:23 wione systemd[1]: Stopped target Graphical Interface.
    jan 18 12:24:23 wione systemd[1]: Stopping Multi-User.
    jan 18 12:24:23 wione systemd[1]: Stopped target Multi-User.
    jan 18 12:24:23 wione systemd[1]: Stopping Login Prompts.
    jan 18 12:24:23 wione systemd[1]: Stopped target Login Prompts.
    jan 18 12:24:23 wione systemd[1]: Stopping Getty on tty1...
    jan 18 12:24:23 wione systemd[1]: Stopping Login Service...
    jan 18 12:24:23 wione login[333]: pam_unix(login:session): session closed for user root
    jan 18 12:24:23 wione login[333]: pam_systemd(login:session): Failed to connect to system bus: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
    jan 18 12:24:23 wione systemd[1]: Stopped D-Bus System Message Bus.
    jan 18 12:24:23 wione systemd[1]: Stopped Getty on tty1.
    jan 18 12:24:23 wione systemd[1]: Stopping Permit User Sessions...
    jan 18 12:24:23 wione systemd[1]: Stopped Permit User Sessions.
    jan 18 12:24:23 wione systemd[1]: Stopped Login Service.
    jan 18 12:24:23 wione systemd[1]: Stopping Basic System.
    jan 18 12:24:23 wione systemd[1]: Stopped target Basic System.
    jan 18 12:24:23 wione systemd[1]: Stopping Dispatch Password Requests to Console Directory Watch.
    jan 18 12:24:23 wione systemd[1]: Stopped Dispatch Password Requests to Console Directory Watch.
    jan 18 12:24:23 wione systemd[1]: Stopping Daily Cleanup of Temporary Directories.
    jan 18 12:24:23 wione systemd[1]: Stopped Daily Cleanup of Temporary Directories.
    jan 18 12:24:23 wione systemd[1]: Stopping Sockets.
    jan 18 12:24:23 wione systemd[1]: Stopped target Sockets.
    jan 18 12:24:23 wione systemd[1]: Stopping D-Bus System Message Bus Socket.
    jan 18 12:24:23 wione systemd[1]: Closed D-Bus System Message Bus Socket.
    jan 18 12:24:23 wione systemd[1]: Stopping System Initialization.
    jan 18 12:24:23 wione systemd[1]: Stopped Setup Virtual Console.
    jan 18 12:24:23 wione systemd[1]: Unmounting Temporary Directory...
    jan 18 12:24:23 wione systemd[1]: Unmounted Temporary Directory.
    jan 18 12:24:23 wione systemd[1]: Unmounted /home.
    jan 18 12:24:23 wione systemd[1]: Starting Unmount All Filesystems.
    jan 18 12:24:23 wione systemd[1]: Reached target Unmount All Filesystems.
    jan 18 12:24:23 wione systemd[1]: Stopping Local File Systems (Pre).
    jan 18 12:24:23 wione systemd[1]: Stopped target Local File Systems (Pre).
    jan 18 12:24:23 wione systemd[1]: Stopping Remount Root and Kernel File Systems...
    jan 18 12:24:23 wione systemd[1]: Stopped Remount Root and Kernel File Systems.
    jan 18 12:24:23 wione systemd[1]: Starting Shutdown.
    jan 18 12:24:23 wione systemd[1]: Reached target Shutdown.
    jan 18 12:24:23 wione systemd[1]: Starting Save Random Seed...
    jan 18 12:24:23 wione systemd[1]: Starting Update UTMP about System Shutdown...
    jan 18 12:24:23 wione systemd[1]: Started Save Random Seed.
    jan 18 12:24:23 wione systemd[1]: Started Update UTMP about System Shutdown.
    jan 18 12:24:23 wione systemd[1]: Starting Final Step.
    jan 18 12:24:23 wione systemd[1]: Reached target Final Step.
    jan 18 12:24:23 wione systemd[1]: Starting Reboot...
    jan 18 12:24:23 wione systemd[1]: Shutting down.
    jan 18 12:24:23 wione systemd-journal[189]: Journal stopped
    -- Reboot --
    Since I have used Xubuntu without hassle for several years, I first thought the problem may be related to systemd reboot and something in my system setup. But I have tried the Fedora 17 live CD and rebooting there works as expected. So, since it works in one systemd distro, it should work with Arch as well.
    Then I thought that it maybe had something to do with the raid-array, something along the lines of
    https://bugzilla.redhat.com/show_bug.cgi?id=752593
    https://bugzilla.redhat.com/show_bug.cgi?id=879327
    But then I found the shutdown hook for mkinitcpio and now I see that the array is stopped and dissassembled. So thats not the problem either. (Or thats what I guess at least.)
    Unfortunately I'm out of ideas. Any help would be grateful.
    Last edited by wingbrant (2013-02-02 22:20:20)

    It turned out that the magic word for me was "reboot=pci" on the kernel command line. With that option set it works lika a charm The machine reboots nice and clean.

  • Time machine disk access on almost allthe time

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  • Error "NOTICE: [0] disk access failed" during guest domain network booting

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    SunOS Release 5.10 Version Generic_137137-09 64-bit
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    MAC
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    RA PA SIZE
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    keyboard-layout=US-English
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    VSW
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    HOSTID
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    1 5 0.0% 100%
    2 6 0.0% 100%
    3 7 0.0% 100%
    4 8 0.0% 100%
    5 9 0.0% 100%
    6 10 0.0% 100%
    7 11 0.0% 100%
    8 12 0.0% 100%
    9 13 0.0% 100%
    10 14 0.0% 100%
    11 15 0.0% 100%
    MEMORY
    RA PA SIZE
    0x8000000 0x88000000 2G
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    VCONS
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    Kind regards,
    Daniel

    Issue solved.
    There was a wrong disk name:
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  • Slow hard disk access --- still wonky

    Hi,
    Recently i've noticed that hard disk access has become very laggy, to the point
    where it's driving me crazy.
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    t
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    Last edited by yourealwaysbe (2012-11-11 14:41:24)

    Arf -- i noticed firefox was still laggy last night, and on a (second or third) reboot this morning, things are back to being laggy even without having run firefox...
    I'm not sure where to look, but here's the output of mount if that will be of any use:
    proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
    sys on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
    dev on /dev type devtmpfs (rw,nosuid,relatime,size=1962404k,nr_inodes=490601,mode=755)
    run on /run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
    /dev/sda3 on / type ext4 (rw,relatime,data=ordered)
    securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
    tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
    devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
    tmpfs on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,mode=755)
    cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd)
    cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
    cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpuacct,cpu)
    cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
    cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
    cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
    cgroup on /sys/fs/cgroup/net_cls type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls)
    cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
    systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=27,pgrp=1,timeout=300,minproto=5,maxproto=5,direct)
    hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime)
    mqueue on /dev/mqueue type mqueue (rw,relatime)
    binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,relatime)
    debugfs on /sys/kernel/debug type debugfs (rw,relatime)
    tmpfs on /tmp type tmpfs (rw,nosuid,nodev,relatime)
    /dev/sda1 on /boot type ext2 (rw,relatime)
    /dev/sda4 on /home type ext4 (rw,relatime,data=ordered)
    All suggestions appreciated
    edit: also, nothing untoward reported by top (i don't think):
    top - 15:52:02 up 16 min, 0 users, load average: 0.36, 0.41, 0.30
    Tasks: 104 total, 2 running, 102 sleeping, 0 stopped, 0 zombie
    %Cpu(s): 0.1 us, 0.2 sy, 0.0 ni, 99.8 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
    KiB Mem: 3930516 total, 779240 used, 3151276 free, 51616 buffers
    KiB Swap: 2626620 total, 0 used, 2626620 free, 285284 cached
    PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
    1 root 20 0 32552 3432 1924 S 0.0 0.1 0:00.51 systemd
    2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
    3 root 20 0 0 0 0 S 0.0 0.0 0:00.04 ksoftirqd/0
    4 root 20 0 0 0 0 S 0.0 0.0 0:00.14 kworker/0:0
    5 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0H
    7 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/u:0H
    8 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
    9 root rt 0 0 0 0 S 0.0 0.0 0:00.00 watchdog/0
    10 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/1
    The lag tends to occur when first tabbing into a directory.  On the second time
    tabbing through things seem to be fast -- i guess that's cached somewhere.
    editedit: i also tried switching back to initscripts, with no improvement, so i guess systemd is off the hook for the remaining problems
    Last edited by yourealwaysbe (2012-11-11 15:13:57)

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    25.42
    2.69 MB/sec [4K blocks]
    Uncached Write
    182.78
    58.51 MB/sec [256K blocks]
    Uncached Read
    93.31
    0.66 MB/sec [4K blocks]
    Uncached Read
    172.38
    31.99 MB/sec [256K blocks]
    Dennis

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    The EM console reports nothing special (no alarms related to storage) apart from the need for more paginated memory.
    I issue a reorg when the segmentation advisor suggests it.
    My optimizer statistics are calculated by the default scheduled job.
    The weird thing I noticed is that as soon as I start the database, there's a huge increase in disk activity even though no query at all is submitted to the database.
    PerfMon reports Current Disk Queue Length > 1000 and disk access time > 3000 ms
    CPU is 2% activity on the 4-cpus server.
    I have plenty of spare memory (currently 3 Go used out of 16).
    This is only a dev server for ETL processes, it has very few concurrent connections.
    Any suggestions welcome.
    AWR report is available here
    http://min.us/mqnXQhd5Z
    Edited by: user10799939 on 22 mars 2012 09:30

    Cache Sizes
    ~~~~~~~~~~~                       Begin        End
                   Buffer Cache:     1,296M     1,296M  Std Block Size:         8K
               Shared Pool Size:       160M       160M      Log Buffer:    14,364K
    Load Profile
    ~~~~~~~~~~~~                            Per Second       Per Transaction
                      Redo size:            460,955.72 ;         2,477,358.63
                  Logical reads:              3,392.16 ;            18,230.80
                  Block changes:              6,451.93 ;            34,675.22
                 Physical reads:                  2.92 ;                15.67
                Physical writes:                394.52 ;             2,120.28
                     User calls:                  1.69 ;                 9.08
                         Parses:                  3.31 ;                17.81
                    Hard parses:                  0.17 ;                 0.90
                          Sorts:                  1.32 ;                 7.09
                         Logons:                  0.06 ;                 0.31
                       Executes:                  7.01 ;                37.68
                   Transactions:                  0.19
      % Blocks changed per Read:  190.20 ;   Recursive Call %:    96.23
    Rollback per transaction %:    0.30 ;      Rows per Sort:    14.41
    Instance Efficiency Percentages (Target 100%)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                Buffer Nowait %:   99.98 ;      Redo NoWait %:   99.86
                Buffer  Hit   %:   99.92 ;   In-memory Sort %:  100.00
                Library Hit   %:   96.30 ;       Soft Parse %:   94.96
             Execute to Parse %:   52.74 ;        Latch Hit %:   99.07
    Parse CPU to Parse Elapsd %:    0.35 ;    % Non-Parse CPU:   99.30
    Shared Pool Statistics        Begin    End
                 Memory Usage %:   75.48 ;  75.51
        % SQL with executions>1:   79.92 ;  85.03
      % Memory for SQL w/exec>1:   77.07 ;  70.09
    Top 5 Timed Events                                         Avg %Total
    ~~~~~~~~~~~~~~~~~~                                        wait   Call
    Event                                 Waits    Time (s)   (ms)   Time Wait Class
    db file sequential read               9,052      17,688   1954   51.3 ;  User I/O
    log file switch (checkpoint in        5,303       4,649    877   13.5 Configurat
    log file switch completion            4,245       4,023    948   11.7 Configurat
    wait for a undo record               32,393       3,531    109   10.3 ;     Other
    db file parallel write               18,771       3,437    183   10.0 System I/O Havent seen this much wait on average. For example 877ms for "log file switch" is over threshold. And other wait events too..
    Time Model Statistics                DB/Inst: MDMPRJ/MDMPRJ  Snaps: 2840-2841
    -> Total time in database user-calls (DB Time): 34446.5s
    -> Statistics including the word "background" measure background process
       time, and so do not contribute to the DB time statistic
    -> Ordered by % or DB time desc, Statistic name
    Statistic Name                                       Time (s) % of DB Time
    sql execute elapsed time                              4,008.5 ;        11.6
    parse time elapsed                                      352.9 ;         1.0
    hard parse elapsed time                                 352.7 ;         1.0
    PL/SQL compilation elapsed time                         120.1 ;          .3
    DB CPU                                                   61.8 ;          .2
    failed parse elapsed time                                21.3 ;          .1
    PL/SQL execution elapsed time                             8.0 ;          .0
    connection management call elapsed time                   0.0 ;          .0
    hard parse (sharing criteria) elapsed time                0.0 ;          .0
    repeated bind elapsed time                                0.0 ;          .0
    hard parse (bind mismatch) elapsed time                   0.0 ;          .0
    DB time                                              34,446.5 ;         N/A
    background elapsed time                              14,889.7 ;         N/A
    background cpu time                                      39.0 ;         N/A
    Wait Class                            DB/Inst: MDMPRJ/MDMPRJ  Snaps: 2840-2841
    -> s  - second
    -> cs - centisecond -     100th of a second
    -> ms - millisecond -    1000th of a second
    -> us - microsecond - 1000000th of a second
    -> ordered by wait time desc, waits desc
                                                                      Avg
                                           %Time       Total Wait    wait     Waits
    Wait Class                      Waits  -outs         Time (s)    (ms)      /txn
    User I/O                       10,515     .1           17,785    1691      15.8
    Configuration                  10,186   79.5 ;           8,865     870      15.3
    System I/O                     27,619     .0            8,774     318      41.6
    Other                          57,768   98.3 ;           6,915     120      87.0
    Commit                          2,634   88.6 ;           2,481     942       4.0
    Concurrency                     2,847   75.4 ;           2,240     787       4.3
    Application                       219    2.3 ;              23     105       0.3
    Network                         4,790     .0                0       0       7.2
              ------------------------------------------------------------- again seen, there is very high wait on User IO
    Wait Events                          DB/Inst: MDMPRJ/MDMPRJ  Snaps: 2840-2841
    -> s  - second
    -> cs - centisecond -     100th of a second
    -> ms - millisecond -    1000th of a second
    -> us - microsecond - 1000000th of a second
    -> ordered by wait time desc, waits desc (idle events last)
                                                                       Avg
                                                 %Time  Total Wait    wait     Waits
    Event                                 Waits  -outs    Time (s)    (ms)      /txn
    db file sequential read               9,052     .0      17,688    1954      13.6
    log file switch (checkpoint           5,303   78.0 ;      4,649     877       8.0
    log file switch completion            4,245   89.2 ;      4,023     948       6.4
    wait for a undo record               32,393   99.8 ;      3,531     109      48.8
    db file parallel write               18,771     .0       3,437     183      28.3
    wait for stopper event to be         24,203   99.8 ;      2,634     109      36.5
    log file sync                         2,634   88.6 ;      2,481     942       4.0
    control file sequential read          7,356     .0       2,431     330      11.1
    buffer busy waits                     2,513   83.1 ;      2,173     865       3.8
    log file parallel write                 520     .0       1,566    3012       0.8
    control file parallel write             840     .0       1,334    1588       1.3
    rdbms ipc reply                         172   91.3 ;        330    1916       0.3
    enq: CF - contention                    309   23.0 ;        268     867       0.5
    log buffer space                        638   28.5 ;        192     301       1.0
    enq: PS - contention                     52   23.1 ;         71    1362       0.1
    db file scattered read                  113     .0          67     590       0.2
    os thread startup                        76   77.6 ;         63     834       0.1
    reliable message                         57   78.9 ;         50     878       0.1
    enq: RO - fast object reuse              22   22.7 ;         23    1038       0.0
    latch free                              537     .0          16      30       0.8
    Streams AQ: qmn coordinator               3  100.0 ;         15    5005       0.0 Overstepping
    Background Wait Events               DB/Inst: MDMPRJ/MDMPRJ  Snaps: 2840-2841
    -> ordered by wait time desc, waits desc (idle events last)
                                                                       Avg
                                                 %Time  Total Wait    wait     Waits
    Event                                 Waits  -outs    Time (s)    (ms)      /txn
    db file parallel write               18,772     .0       3,437     183      28.3
    events in waitclass Other            24,367   99.5 ;      3,010     124      36.7
    control file sequential read          6,654     .0       2,333     351      10.0
    log file parallel write                 520     .0       1,566    3012       0.8
    control file parallel write             840     .0       1,334    1588       1.3
    buffer busy waits                       899   94.2 ;        884     984       1.4
    log file switch (checkpoint             206   82.0 ;        185     898       0.3
    os thread startup                        76   77.6 ;         63     834       0.1
    log file switch completion               46   93.5 ;         45     982       0.1
    log buffer space                        158   31.0 ;         12      77       0.2
    db file sequential read                  62     .0           7     111       0.1
    db file scattered read                   20     .0           6     318       0.0
    direct path read                        660     .0           5       7       1.0
    log file sequential read                 66     .0           4      65       0.1
    log file single write                    66     .0           1      16       0.1
    enq: RO - fast object reuse               2     .0           0      38       0.0
    latch: cache buffers chains               3     .0           0       6       0.0
    direct path write                       660     .0          -5      -8       1.0
    rdbms ipc message                     9,052   87.5 ;     21,399    2364      13.6
    pmon timer                            1,318   90.4 ;      3,562    2703       2.0
    Streams AQ: qmn coordinator             633   97.6 ;      3,546    5602       1.0
    Streams AQ: waiting for time             77   61.0 ;      3,449   44795       0.1
    PX Deq: Join ACK                         21     .0           0       0       0.0 Again overshooting
    Tablespace IO Stats                  DB/Inst: MDMPRJ/MDMPRJ  Snaps: 2840-2841
    -> 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)
    UNDOTBS1
               914       0 ######     1.0 ;   1,368,515      383      2,534  863.2
    MDMREF_INDICES
             6,918       2 ######     1.0 ;      11,086        3          0    0.0
    SYSAUX
               626       0 ######     1.1 ;       1,804        1          0    0.0
    SYSTEM
               850       0 ######     1.7 ;         296        0          0    0.0
    MDMREF_DATA
               293       0  712.3 ;    1.0 ;         274        0          0    0.0
    MDMPRJ_ODS
               198       0   72.1 ;    1.0 ;         198        0          0    0.0
    FEU_VERT
                33       0   61.5 ;    1.0 ;          33        0          0    0.0
    USERS
                33       0   31.5 ;    1.0 ;          33        0          0    0.0
              ------------------------------------------------------------- Now have a serious look at it. Av Rd(ms). Now for some tablespace value cannot event fit in window thats why its showing ##
    According to oracle recommendation Av Rd(ms) shouldn't be greater then 20, if its goes over 20 then its considered to be an issue with IO subsystem. But as its seen that in your case its overshooting.
    Now the question from my side
    Have done any configuration changes?
    I would suggest you to revert these changes asap and contact storage admin guys...
    Hope this helps

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