Draemon's questions

I'm seeing output from smartctl where the VALUE is much less than WORST for some attributes. Does this make sense? What does it mean?

Everything I have read indicates that:

• The raw value (RAW_VALUE in smartctl output) is manufacturer specific but sometimes useful
• The normalised value (VALUE in smartctl output) is normalised to the range 0..254 with higher always meaning better, but in a manufacturer specific way
• The worst value seen by the drive is tracked (WORST in smartctl output)
• If the current / worst value drops below the threshold (THRESH in smartctl output) and the attribute is a pre-fail attribute, it's a bad sign

I have a (believed healthy, if a little old) drive that has:

ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate     0x000f   200   200   051    Pre-fail  Always       -       0
3 Spin_Up_Time            0x0003   185   181   021    Pre-fail  Always       -       3725
4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       38
5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
7 Seek_Error_Rate         0x000f   200   200   051    Pre-fail  Always       -       0
9 Power_On_Hours          0x0032   076   076   000    Old_age   Always       -       17851
10 Spin_Retry_Count        0x0013   100   253   051    Pre-fail  Always       -       0
11 Calibration_Retry_Count 0x0012   100   253   051    Old_age   Always       -       0
12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       36
190 Airflow_Temperature_Cel 0x0022   073   043   045    Old_age   Always   In_the_past 27
194 Temperature_Celsius     0x0022   120   090   000    Old_age   Always       -       27
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0012   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0010   200   200   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x003e   200   200   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x0009   200   200   051    Pre-fail  Offline      -       0

Which I interpret as everything's fine, although the drive got slightly too hot once (190 Airflow_Temperature_Cel).

My question is what's going on with lines 10 and 11 enter code herewhere WORST > VALUE?

I find it crazy that this doesn't work out of the box, but neither atftpd nor tftpd-hpa seem to have any way to log to the console. I've run them in the foreground with verbosity right up but clearly that's not the right magic incantation.

I'm running a short-lived server for a firmware upload and I want to see the requests (and ideally when they've completed).

I'm getting the following error when I start Jetty:

2010-03-01 12:30:19.328:WARN::Failed startup of context WebAppContext@15ddf5@15ddf5/webapp,null,/path/to/jetty-distribution-7.0.1.v20091125/webapps-plus/webapp.war

With this commandline:

java -jar start.jar OPTIONS=All lib=/path/to/jetty-distribution-7.0.1.v20091125/lib/ext etc/jetty.xml etc/jetty-plus.xml /path/to/webapp/src/configuration/test.xml

And test.xml contains:

<?xml version="1.0"  encoding="ISO-8859-1"?>
<!DOCTYPE Configure PUBLIC "-//Mort Bay Consulting//DTD Configure//EN" "http://www.eclipse.org/jetty/configure.dtd">
<Configure class="org.eclipse.jetty.webapp.WebAppContext">
  <Set name="contextPath">/webapp</Set>
  <Set name="war"><SystemProperty name="jetty.home" default="."/>/webapps-plus/webapp.war</Set>
</Configure>

If I don't include test.xml on the commandline it works fine.

I'd rather not run round checking each machine individually, is there some server-side software I can use? It's a mixed linux/windows network (clients and servers) but I'm only interested in the windows clients.

My app is working fine with toplink, but I need some eclipselink features, so I decided to swap.

I changed the provider in persistence.xml to:

<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>

and added the following property (though I'm not sure if this is needed):

<property name="eclipselink.target-server" value="SunAS9"/>

I've tried packaging eclipselink.jar with my app, and I've tried putting it in $GFHOME/lib and adding it to the classpath suffix through the glassfish admin ui. Whatever I do, I get:

Exception [EclipseLink-28018] (Eclipse Persistence Services - 1.1.3.v20091002-r5404): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [MYAPP] failed.
Internal Exception: java.security.AccessControlException: access denied (java.lang.RuntimePermission createClassLoader)
javax.persistence.PersistenceException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 1.1.3.v20091002-r5404): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [MYAPP] failed.
Internal Exception: java.security.AccessControlException: access denied (java.lang.RuntimePermission createClassLoader)
        at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:878)
        at org.eclipse.persistence.jpa.PersistenceProvider.createContainerEntityManagerFactory(PersistenceProvider.java:216)
        at com.sun.enterprise.server.PersistenceUnitLoaderImpl.load(PersistenceUnitLoaderImpl.java:149)
        at com.sun.enterprise.server.PersistenceUnitLoaderImpl.load(PersistenceUnitLoaderImpl.java:84)
        at com.sun.enterprise.server.AbstractLoader.loadPersistenceUnits(AbstractLoader.java:895)
        at com.sun.enterprise.server.ApplicationLoader.doLoad(ApplicationLoader.java:184)
        at com.sun.enterprise.server.TomcatApplicationLoader.doLoad(TomcatApplicationLoader.java:126)
        <snip>
Caused by: Exception [EclipseLink-28018] (Eclipse Persistence Services - 1.1.3.v20091002-r5404): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [MYAPP] failed.
Internal Exception: java.security.AccessControlException: access denied (java.lang.RuntimePermission createClassLoader)
        at org.eclipse.persistence.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:210)
        ... 82 more
Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission createClassLoader)
        at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
        at java.security.AccessController.checkPermission(AccessController.java:546)
        at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
        at java.lang.SecurityManager.checkCreateClassLoader(SecurityManager.java:594)
        at java.lang.ClassLoader.<init>(ClassLoader.java:202)
        at java.security.SecureClassLoader.<init>(SecureClassLoader.java:53)
        at com.sun.enterprise.loader.EJBClassLoader$DelegatingClassLoader.<init>(EJBClassLoader.java:1368)
        at com.sun.enterprise.loader.EJBClassLoader.copy(EJBClassLoader.java:384)
        at com.sun.enterprise.server.PersistenceUnitInfoImpl.getNewTempClassLoader(PersistenceUnitInfoImpl.java:216)
        at org.eclipse.persistence.platform.server.ServerPlatformBase.getNewTempClassLoader(ServerPlatformBase.java:477)
        at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:741)
        ... 81 more

and the app does not deploy.

Edit - I tried changing to security settings but ran into another problem

I would have though the following (in server.policy already) would have allowed eclipselink.jar full access, but apparently not.

// Core server classes get all permissions by default
grant codeBase "file:${com.sun.aas.installRoot}/lib/-" {
    permission java.security.AllPermission;
};

I added the following:

grant {
    permission java.security.AllPermission;
};

And now I get:

WARNING: "IOP00810257: (MARSHAL) Could not load class org.eclipse.persistence.indirection.IndirectList"

on the client side

Edit which I've just realised is GlassFish v2.1 -- getting Application Client and Eclipselink to work together? and having ensured the jar gets bundled with the app, it now works.

I'm looking to build a server farm for a web business, I will need front end webservice servers and a common NAS file server backend.

Some companies choose to buy the fastest most reliable hardware which costs a premium. Other companies choose to buy lower spec cheap PC hardware but more of it. They build highly redundant systems, which they swap out when they fail. I believe Google takes that later approach.

Has anyone any real life specific experience and advice to offer me?

Connector settings:

<Connector ...
compression="2048"
noCompressionUserAgents="gozilla, traviata"
compressionMimeType="text/html,text/xml,text/plain,text/css,text/javascript"/>

This seems to work for html, but not for css or javascript. compression="force" does work, but compression="on" doesn't. compression="2" doesn't work either, so I don't know what "force" is really doing.

The files in question are about 6k, I've cleared the browser cache, etc.

I am trying to run tomcat on a low memory system (150-256Mb). Even though I start the JVM with -Xmx64m (which should be the default anyway), the process immediately takes up 200Mb+.

I wonder why the JVM needs so much memory itself, or if there is a way of tuning this? Are other JVMs better than the sun one for low memory consumption - and do they work with tomcat?