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Search found 7 results on 1 pages for 'ichorus'.

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• Sar data not collected for 10 minutes

  - by Ichorus

  We have a RedHat server whose only job is to run a JBoss server. Monitors said that memory usage spiked (we have the JVM limited to far less than the total memory on the system) and JBoss crashed. We restarted and everything seems ok now. Odd thing is that sar data for 10 min leading up to the crash is simply not there. Load average got up to the 50s. I have seen severely busy systems (350+ Load Average) still collect sar data. Does anyone have any idea what could cause sar to stop collecting data?

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• What would cause JBoss to take up 4 more GB of memory than what is allocated?

  - by Ichorus

  Relevant part of the start up line: java -server -Xms10G -Xmx10G -XX:PermSize=1G -XX:MaxPermSize=1G This instance ended up taking up 16GB of memory and 10GB of swap before killing the server. Any ideas on what could cause that? This is the only major application running on a RedHat system with 16GB RAM and 10GB swap.

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• DB2 LUW tools for diagnosing issues when the stuff hits the fan

  - by Ichorus

  I am no DBA and very much a novice when it comes to DB2 so even 'obvious' answers are welcome to this question: I love db2top but sometimes I cannot get it to run if the load average is high on a db2 LUW. This morning I was looking at an issue where load average shot up suddenly, I could not get db2top to come up and I needed to find out what was happening. What can I do to find out who is doing what in this situation? I suspected a horribly bad query was being run by someone...is there a good way to find information on poor performing SQL on the fly in that type of situation? Are there any good ways to collect good, actionable stats who/where bad sql is coming from in the event that load average is so high? I know about db2pd but I am not sure how to use it effectively and slogging through tens of thousands of lines of raw data is probably not the most efficient way to get at the heart of a problem. Any tips or resources?

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• How to log all sql going through JBoss datasource with log4j

  - by Ichorus

  I've looked at log4jdbc (which does not support datasources), p6spy which seems to be what I am looking for but it has not been updated since 2003 which makes me nervous and lists only JBoss 3.x (we use JBoss 5), and JAMon which seems heavyweight for what I am trying to accomplish (a simple log of all SQL statements running through a JBoss application server). I was hoping that JBoss itself would have a switch to log all the sql (as Websphere does) but I cannot find any documentation for it so that functionality might not exist.

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• What could cause a file system to spontaneously unmount or become invalid for a short time?

  - by Ichorus

  We've got DB2 LUW running on a RHEL box. We had a crash of DB2 and IBM came back and said that a file that DB2 was trying to access (through open64()) unmounted or became invalid. We have done nothing but restart the database and things seem to be running fine. Also, the file in question looks perfectly normal now: $ cd /db/log/TEAMS/tmsinst/NODE0000/TEAMS/T0000000/ $ ls -l total 557604 -rw------- 1 tmsinst tmsinst 570425344 Jan 14 10:24 C0000000.CAT $ file C0000000.CAT C0000000.CAT: data $ lsattr C0000000.CAT ------------- C0000000.CAT $ ls -l total 557604 -rw------- 1 tmsinst tmsinst 570425344 Jan 14 10:24 C0000000.CAT With those facts in hand (please correct me if I am mis-interpreting the data at hand) what could cause a file system to 'spontaneously unmount or become invalid for a short time'? What should my next step be? This is on Dell hardware and we ran their diagnostic tools against the hardware and it came back clean.

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• How to log all sql going through JBoss datasource with log4j

  - by Ichorus

  I've looked at log4jdbc (which does not support datasources), p6spy which seems to be what I am looking for but it has not been updated since 2003 which makes me nervous and lists only JBoss 3.x (we use JBoss 5), and JAMon which seems heavyweight for what I am trying to accomplish (a simple log of all SQL statements running through a JBoss application server). I was hoping that JBoss itself would have a switch to log all the sql (as Websphere does) but I cannot find any documentation for it so that functionality might not exist.

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• Running commands over ssh with Java

  - by Ichorus

  Scenerio: I'd like to run commands on remote machines from a Java program over ssh (I am using OpenSSH on my development machine). I'd also like to make the ssh connection by passing the password rather than setting up keys as I would with 'expect'. Problem: When trying to do the 'expect' like password login the Process that is created with ProcessBuilder cannot seem to see the password prompt. When running regular non-ssh commands (e.g 'ls') I can get the streams and interact with them just fine. I am combining standard error and standard out into one stream with redirectErrorStream(true); so I am not missing it in standard error...When I run ssh with the '-v' option, I see all of the logging in the stream but I do not see the prompt. This is my first time trying to use ProcessBuilder for something like this. I know it would be easier to use Python, Perl or good ol' expect but my boss wants to utilize what we are trying to get back (remote log files and running scripts) within an existing Java program so I am kind of stuck. Thanks in advance for the help!

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