Dtrace and io problem
Hi,
We have an M4000 which is connected to numerous HDS USPV1 LUN's (not sure of the HDS configuration).
The problem is when a Database load occurs the response time goes from 50ms upto 100ms. There is no io/wait, load average is low, no CPU or memory problems but %b on iostat is constantly at 99/100%.
Im told the maximum number of IOPS from hds LUN is 720 (and there are 15 LUN's presented to zpool's).
I turned to dtrace in the hope of finding something which would explain the problem but after reading up countless blogs, PDF's im still at a loss. I downloaded the dtrace toolkit and ran iotop, iosnoop etc etc which although produced a lot of info it was in fact too much info and didnt really show what the problem was (although didnt think it would be that easy).
In fact when running iosnoop/iowait I received the following:
dtrace: 679 dynamic variable drops
dtrace: 1 dynamic variable drop with non-empty rinsing list
dtrace: 664 dynamic variable drops with non-empty dirty list
dtrace: 1712 dynamic variable drops
dtrace: 2074 dynamic variable drops
dtrace: 2123 dynamic variable drops
I'll be investigating and reading up further on dtrace but in the meantime if anyone could point me in the direction of a dtrace command which could enlighten me as to the IO problem it would be appreciated. Appreciate its a far reaching question but anything would help!!!
Thanks.
Thanks try and go through them one by one.....
the %b/busy column in iostat is commonly mis-understood. There is a good document in the my support knowledge base explaining why busy is at 100%. It hard to generalise but if %b is 100% with little signs of issues its normally the application (database in this case) is not utilising the hardware, eg going stuff in serials instead of parallel.
What Does %b (or %Busy) Actually Mean in the Output of iostat(1M)? [ID 1003635.1]
The 'dtrace: xxxx dynamic variable drops' messages are associated with the internal dtrace log buffers overfilling. Off the top of my head the easier way to address this is reduce the amount of data you are logging, increase the buffer size of increase the rate these buffers are flushed. Try looking at the following two documents. You may be interested in bufsize, dynvarsize and cleanrate.
http://wikis.sun.com/display/DTrace/Buffers+and+Buffering
http://wikis.sun.com/display/DTrace/Options+and+Tunables
No idea where 720 IOPS came from. Very rough rule of thumbs is if you are getting 500 iops from a standard disk your are doing well. With someone workloads you may only see 150 iops. If you look at the specs for some of the arrays your talking 100k iops if not more.
Stuff changes all the time but last time I looked response times within iostat are the amount of time an io is on the wire PLUS the time to complete that io in software PLUS the time to schedule the next io. So get the numbers iostat reports and compare it those the array is reporting. Are they the same (array saturated?) or different (software issue?) or something else.
Anyway, play with dtrace and see what you can work out.
All rather interesting for a nerd.
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'''(in English)'''Hi Danny,
Per my understanding that you can't get the expect result by using the expression "=Count(Fields!TICKET_STATUS.Value=4) " to count the the TICKET_STATUS which value is 4, the result will returns the count of all the TICKET_STATUS values(206)
but not 180, right?
I have tested on my local environment and can reproduce the issue, the issue caused by you are using the count() function in the incorrect way, please modify the expression as below and have a test:
=COUNT(IIF(Fields!TICKET_STATUS.Value=4 ,1,Nothing))
or
=SUM(IIF(Fields!TICKET_STATUS=4,1,0))
If you still have any problem, please feel free to ask.
Regards,
Vicky Liu
Vicky Liu
TechNet Community Support -
BOSD, Battery issues and Heating problem after iOS 8 upgrade
i have upgraded my iPad mini to iOS 8. Ever since I upgraded to iOS 8 am facing blue screen issues and heating problem as well. This is really frustrating even the patch iOS 8.0.2 dint solve the problem. Are you guys listening our complaints. When will you fixing it.
The same thing happened to me on my 2012 Subaru Outback. I'm not sure this will help you since you have a Honda, but I'm posting this just in case.
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I am making code to try to make a game and my problem is that my code......
I am making code to try to make a game and my problem is that my code
will not let it change the hit everytime so im getting the first guy to hit 1 then next hits 8 and so on and always repeats.
Another problem is that I would like it to attack with out me telling it how much times to attack. I am using Object oriented programming.
Here is the code for my objects:
import java.lang.*;
import java.io.*;
import java.net.*;
import java.util.*;
import java.util.Random;
import static java.lang.Math.*;
import java.awt.*;
import java.awt.color.*;
class rockCrab {
//Wounding formula
double sL = 70; // my Strength Level
double bP = 1; // bonus for prayer (is 1 times prayer bonus)
double aB = 0; // equipment stats
double eS = (sL * bP) + 3; // effective strength
double bD = floor(1.3 + (eS/10) + (aB/80) + ((eS*aB)/640)); // my base damage
//Attack formula
double aL = 50; // my Attack Level
double eD = 1; // enemy's Defence
double eA = aL / eD; // effective Attack
double eB = 0; // equipment bonus'
double bA = ((eA/10) * (eB/10)); // base attack
//The hit formula
double fA = random() * bA;
double fH = random() * bD;
double done = rint(fH - fA);
//health formula
double health = floor(10 + sL/10 * aL/10);
rockCrab() {
void attack() {
health = floor(10 + sL/10 * aL/10);
double done = rint(fH - fA);
fA = random() * bA;
fH = random() * bD;
done = rint(fH - fA);
System.out.println("Rockcrab hit" +done);
import java.lang.*;
import java.io.*;
import java.net.*;
import java.util.*;
import java.util.Random;
import static java.lang.Math.*;
import java.awt.*;
import java.awt.color.*;
class self {
//Wounding formula
double sL = 1; // my Strength Level
double bP = 1; // bonus for prayer (is 1 times prayer bonus)
double aB = 0; // equipment stats
double eS = (sL * bP) + 3; // effective strength
double bD = floor(1.3 + (eS/10) + (aB/80) + ((eS*aB)/640)); // my base damage
//Attack formula
double aL = 1; // my Attack Level
double eD = 1; // enemy's Defence
double eA = aL / eD; // effective Attack
double eB = 0; // equipment bonus'
double bA = ((eA/10) * (eB/10)); // base attack
//The hit formula
double fA = random() * bA;
double fH = random() * bD;
double done = rint(fH - fA);
//health formula
double health = floor(10 + sL/10 * aL/10);
self() {
void attack() {
health = floor(10 + sL/10 * aL/10);
fA = random() * bA;
fH = random() * bD;
done = rint(fH - fA);
System.out.println("You hit" +done);
}Here is the main code that writes what the objects do:
class fight {
public static void main(String[] args) {
self instance1 = new self();
rockCrab instance2 = new rockCrab();
instance2.health = instance2.health - instance1.done;
System.out.println("You hit: " +instance1.done);
System.out.println("rockCrabs health: " + instance2.health);
instance1.health = instance1.health - instance2.done;
System.out.println("RockCrab hit: " +instance2.done);
System.out.println("rockCrabs health: " + instance1.health);
instance2.health = instance2.health - instance1.done;
System.out.println("You hit: " +instance1.done);
System.out.println("rockCrabs health: " + instance2.health);
instance1.health = instance1.health - instance2.done;
System.out.println("RockCrab hit: " +instance2.done);
System.out.println("rockCrabs health: " + instance1.health);
instance2.health = instance2.health - instance1.done;
System.out.println("You hit: " +instance1.done);
System.out.println("rockCrabs health: " + instance2.health);
instance1.health = instance1.health - instance2.done;
System.out.println("RockCrab hit: " +instance2.done);
System.out.println("rockCrabs health: " + instance1.health);
instance2.health = instance2.health - instance1.done;
System.out.println("You hit: " +instance1.done);
System.out.println("rockCrabs health: " + instance2.health);
instance1.health = instance1.health - instance2.done;
System.out.println("RockCrab hit: " +instance2.done);
System.out.println("rockCrabs health: " + instance1.health);
}when the code is run it says something like this:
you hit 1
RockCrabs health is 9
RockCrab hit 7
your health is 38
you hit 1
RockCrabs health is 8
RockCrab hit 7
your health is 31
you hit 1
RockCrabs health is 7
RockCrab hit 7
your health is 24
you hit 1
RockCrabs health is 6
RockCrab hit 7
your health is 17
my point is whatever some one hits it always repeats that
my expected output would have to be something like
you hit 1
RockCrabs health is 9
RockCrab hit 9
your health is 37
you hit 3
RockCrabs health is 6
RockCrab hit 4
your health is 33
you hit 2
RockCrabs health is 4
RockCrab hit 7
your health is 26
you hit 3
RockCrabs health is 1
RockCrab hit 6
your health is 20
Edited by: rade134 on Jun 4, 2009 10:58 AM[_Crosspost_|http://forums.sun.com/thread.jspa?threadID=5390217] I'm locking.
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Most articles have stated that there is an option to disable the IR receiver in the "security" window under system preferences. When the IR and remote are not working this option disappears but when they are working the option is present. I have also tried replacing the battery without any result.
I am now thinking that it might have something to do with heat buildup because it is mainly occuring after the laptop has been on for about a half hour, so I am going to try to borrow someone's fan.
If anyone has any suggestions to solve this I would appreciate it if you could help. Thanks!
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LG Ally text message and gps problems
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Master Reset/Soft Reset:
Factory Reset option 1
From the main screen, touch menu tab
Touch Settings
Touch Privacy
Touch Factory Data reset
Touch Reset Phone
Warning: This will erase all data from your phone, including:
Your Google account
System and application data and settings
Downloaded Applications
It will not erase: Current System software and bundled applications; SD Card files, such as music or Photos
Factory Reset option 2 - Warning this will reset device back to original factory settings.
Turn off the phone
Press and hold "home" + "end" + "volume up or down" keys together for a few seconds when the device is power off
Once device displays boot information, release keys.
Soft Reset
Press the Power key.
Touch Power off.
Touch OK.
Press the Power key to power on the device.
or
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The Sad iPod icon.
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http://support.apple.com/kb/ts4268
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So, an update... after reading through a bunch of similar complaints (there are literally 1000's of them so there's NO WAY this isn't somehow ios7 related, thanks a lot APPLE ) I decided to try a restore in recovery mode. After 3 hours and several disconnections... I ended up having to just set it up as a new iPad, as the restore did nothing. Weirdly though... as I was doing the restore in recovery mode.. I noticed I'd gotten up to a 10% charge.. higher than it's been since September, so after setting it up as a new device, I turned it off and plugged it in using the wall charger. 2 hours later and I was up to 38%. Still not great, as my iPad, before ios7 could've fully charged twice in the amount of time it took for me to now get 28% more of a charge. And that's with a fully cleaned out device.. so that really ***** and I'm now more confused than ever.
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i mean that i phone take time to open apps ,contact ,etc why? i close all apps and the problem still?
Try a reset by pressing and holding the home and power buttons for 15-20 seconds until the white Apple logo appears.
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If you still have access to your old email address, go to https//appleid.apple.com, click Manage my Apple ID and sign in with your iCloud ID. Tap edit next to the primary email account, tap Edit, change it back to your old email account and verify it. Then edit the name of the account to change it back to your old email address. You can now use your current password to turn off Find My iPhone on your device. Then go to Settings>iCloud, tap Delete Account and choose Delete from My iDevice when prompted (your iCloud data will still be in iCloud). Next, go back to https//appleid.apple.com and change your primary email address and iCloud ID name back to the way it was. You can now go to Settings>iCloud and sign in with your correct iCloud ID and password.
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Apple TV worked until today. Message says unsupported signal check your output device. I have checked hdmi cable with another device and it's fine. Put on a different tv and same message. Went out yesterday and bought a new Apple TV and same problem.
Which TV do you have.
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Press and hold the menu and the up button simultaneously on the remote for six seconds, the Apple TV should then begin to cycle through the various resolutions available to it at 20 second intervals.. If you see a picture appear up on your screen, use the remote to scroll down to the OK option and select it. -
No Battery Charge and Other Problems After OS3 Install - Solution?
This relates ONLY to iPhone Users using the "PUSH" Function for Email or Other Apps!
PROBLEM: It seems as though Apple is at least aware of the problem(s), i.e. once Exchange Email or another App using PUSH is configured, there is an OS3 bug that seems to be hardware independent (impacting ALL 1G, 2G and GS iPhones, but not consistently).
SYMPTOMS: Include some or all of the following . . . rapid discharge (less than two hours from a fully charged phone, failure to charge (by AC adapter or USB to computer), failure to charge completely, perpetual dead battery icon, inability to boot, inability to automatically sleep, quite warm on upper back side, slow email, indication of a full or partially full charge dropping to no charge or dead when removed from charging source.
CAUSE: OS3 Bug prevents consistent charging, draining the battery even when plugged in to a computer via the USB or into an A/C adapter (although I've been able to intermittently charge on an A/C adapter). In push mode, the Exchange email client on the iPhone continually queries the Exchange Server, cycling the iPhone CPU and continually draining the battery at a high rate (can
WHAT I'VE BEEN TOLD BY APPLE:
1) Defective Hardware (though I'm on my third 3G in a week, so I don't think hardware is the problem . . . Apple will consider replacement with a new 3G if my third 3G has the same problem)
2) Corrupted App in iTunes - so I manually reloaded each app directly over wi-fi, one app at a time, this worked until I configured Exchange Email, at which time symptoms immediately appeared . . . so corrupted app unlikely.
3) Initial data transfer after email configuration . . . but symptoms continued long after this.
4) Wi-Fi - but turning wi-fi on or off had little effect, beyond normal.
5) Restore to New Phone - this works fine UNTIL Exchange Email is configured and activated. Thus, the time consuming practice of reload all apps, photos, music, etc. will be for naught, once exchange email is turned on with "push"
SOLUTION: Turning off "push" on your exchange email account
1) Go to Settings - Mail, Contacts, Calendars - Fetch New Data
2) Set Fetch Setting to 15 minutes to approximate the much more frequent "push" uploads and downloads. NOTE: Turning off \"push\" at this level will NOT turn off push on your exchange email account and the problem will not be resolved
3) Scroll down and select - Advanced -
4) Identify and select your Exchange Server account
5) Select - Fetch -
6) Leave settings
Phone should cool down in a few minutes and work normally. The problem can be replicated and resolved repeatedly merely by toggling "push" on and off in your exchange email configuration.
I was told that this is likely to be the "fix" until a patch is issued. No time frame was given for an actual fix that allows Exchange users to use push technology. Disappointing, since broader use of "push" technology beyond exchange was one of the big benefits of OS 3.0.
NOTE: THIS PROBLEM DOES NOT OCCUR ON ALL iPHONES WITH OS3 USING THE EXCHANGE CLIENT. I have second 3G phone, identically configured (including push to exchange email) that has no symptoms at all. Go figure.Since two days ago, my battery indicator has been indicating 100% until the phone dies, which seems to be one of the symptoms you're describing.
However, I don't use Push emails; my email client is configured to poll an imap server and has been that way since I got my phone over 6 months ago. To be on the safe side, I turned off Push anyway, but I'm still having the problem. Definitely 3.0 related as I've never had this problem before.
Perhaps it's linked to an app? Personally I don't have a whole lot of them installed: Aurora Feint, fstream, twitterific, flixster, wikipanion, google earth, urbanspoon, STM Mobile, iDicto, Air Sharing, Facebook and Apple Remote. I've removed a few and will see how it goes.
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