Oracle PRM与JVM以及OS
PRM(ParnassusData Recovery Manager)基于JAVA语言开发，得益于JVM Java虚拟机，PRM可以无需反复编译就在几乎所有支持JAVA的操作
PRM(ParnassusData Recovery Manager)基于JAVA语言开发，得益于JVM Java虚拟机，PRM可以无需反复编译就在几乎所有支持JAVA的操作平台上运行，包括但不限于：AIX、Solaris、HPUX、Linux和Windows。
PRM在开发过程中充分考虑了老系统平台，最低可以兼容到JAVA 1.4版本，这意味着那些无法安装新JDK/JRE的老操作系统也可以运行PRM。
例如在2003年出品的Red Hat Enterprise Linux AS release 3 (Taroon)上安装了JRE 1.4.2
root@rh3 root]# uname -a
Linux rh3 2.4.21-4.EL #1 Fri Oct 3 18:13:58 EDT 2003 i686 i686 i386 GNU/Linux
[root@rh3 root]# cat /etc/issue
Red Hat Enterprise Linux AS release 3 (Taroon)
Kernel \r on an \m
[root@rh3 root]# java -version
java version "1.4.2_19"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_19-b04)
Java HotSpot(TM) Client VM (build 1.4.2_19-b04, mixed mode)
[root@rh3 root]#
[root@rh3 root]# which java
/usr/bin/java
10年前出品的RHEL 3同样可以正常运行PRM:
java –jar prm.jar
虽然PRM可以正常在JRE 1.4.2上运行，但为了获得最佳性能和最佳体验，诗檀推荐用户安装JDK 1.6以上版本，建议为JDK 1.7。
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JDK下载
Linux和Windows上的JDK 1.7较为容易下载，而AIX上的JDK由IBM自行提供，下载较为麻烦。这里提供部分JDK 1.7的下载路径：
AIX JAVA SDK 7
Linux JDK 7 64bit
Linux JDK 7 32bit
Solaris JDK 7 x86-64bit
Solaris JDK 7 x86-32bit
Solaris JDK 7 Sparc
都在：
PRM 启动参数
常规情况下PRM使用prm.sh(Unix/Linux) 或 prm.bat(Windows)启动，即：
$ ./prm.sh
[root@rh3 prm_3002]# cat prm.sh
echo "It's recommended that you can use JDK 1.6 or higher version"
echo "Download latest JDK "
java -Xms1024M -jar prm.jar
prm.sh在调用prm.jar JAVA程序包时会加上-Xms1024M参数
但如果用户所运行的JAVA环境不是JDK 1.6以上版本则可能出现如下的一些问题：
1. prm.sh启动遇到 “Incompatible initial and maximum heap sizes specified”问题
[root@rh3 prm_3002]# ./prm.sh
It's recommended that you can use JDK 1.6 or higher version
Download latest JDK
Error occurred during initialization of VM
Incompatible initial and maximum heap sizes specified
" Incompatible initial and maximum heap sizes specified”该报错是因为当前所运行的JAVA环境不支持-Xms1024M参数，如果不想升级JAVA环境的话，可以执行运行：
$ java –jar prm.jar
2.PRM在RedHat自带的gcj java 1.4.2下运行时遇到如下问题：
Exception when analysing ASM disk header.
Issue for analysing ASM disk header for: /dev/raw/raw1
Exception when analysing ASM disk header.
Issue for analysing ASM disk header for: /dev/raw/raw2
Exception when analysing ASM disk header.
Issue for analysing ASM disk header for: /dev/raw/raw3
Exception when analysing ASM disk header.
Issue for analysing ASM disk header for: /dev/raw/raw4
Exception when analysing ASM disk header.
Issue for analysing ASM disk header for: /dev/raw/raw5
Exception when analysing ASM disk header.
Issue for analysing ASM disk header for: /dev/raw/raw6
Exception when analysing ASM disk header.
Issue for analysing ASM disk header for: /dev/raw/raw7
~
gc warning: Repeated allocation of very large block (appr.size 512000):
May lead to memory leak and poor performance.
这是因为Redhat自带的GCJ 1.4.2的GC垃圾回收存在问题所导致的，建议使用Oracle JDK 1.6或以上版本， 使用redhat free software foundation 的gcj确实可能发生该问题。
3. Prm.bat启动过程中遇到” Error: no `server' JVM at `D:\Program Files (x86)\Java\jre1.5.0_22\bin\server\jvm.dll'.”问题
这是因为用户的JAVA运行环境中仅仅安装了JRE，，因为jRE在1.5中是没有-server选项的所以出现了如上问题。
可以通过升级到JDK 1.6以上版本解决，也可以去掉-server选项来运行,即：
java –jar prm.jar
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