最近在配置samba，windows连接的时候出现如下问题：
samba
不允许一个用户使用一个以上用户名与一个服务器或共享资源的多重连接,
google查询后，找到解决方法：
如下：
net use * /del /y
实际上我估计我自己重新启动windows就OK了。因为在配置的过程中改来改去。
加上linux中我使用selinux安全机制，引入了许多麻烦。
http://blog.chinaunix.net/u/19637/showart_491257.html
查看全文http://www.itpub.net/viewthread.php?tid=829560&pid=10201894&page=1&extra=#pid10201894
主题: Different type of RMAN backup compression in 11G
文档 ID: 注释:427581.1 类型: REFERENCE
上次修订日期: 31-JUL-2007 状态: REVIEWED
In this Document
Purpose
Different type of RMAN backup compression in 11G
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Applies to:
Oracle Server - Enterprise Edition - Version: 11.0
Information in this document applies to any platform.
Purpose
In addition to the existing BZIP2 algorithm for binary compression of backup in oracle 10G, RMAN 11G executable also support ZLIB algorithm for the compress backup.ZLIB is the default compression for RMAN in 11G
Different type of RMAN backup compression in 11G
RMAN support binary compression of backup sets.You can choose which compression algorithm that RMAN uses for backups.By default, RMAN uses ZLIB compression.
ZLIB Compression is very fast but compression ratio is not as good as other algorithm.
BZIP2 Compression ratio is very good but is slower than ZLIB
If the COMPATIBLE initialization parameter is set to 11.0 or higher , then the default compression for RMAN backups is ZLIB. IF the COMPATIBILITY initialization parameter is set lower than 11.0 and greater than 10.2 then the default and only possible compression algorithm is BZIP2
Compression can be used for backupset of datafile, archive log and controlfiles.
e.g
RMAN> backup as compressed backupset archivelog all;
RMAN> backup as compressed backupset database;
RMAN> backup as compressed backupset current controlfile;
RMAN compress the backupset contents before writing to disk.No extra decompression steps are required during recovery for rman compressed backup;
To configure the compression algorithm
CONFIGURE COMPRESSION ALGORITHM '<alg_name>';
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http://www.itpub.net/viewthread.php?tid=976546
昨天安装zabbix，遇到一个问题，< 被解析成要求输入变量了。
按照zalbb 的提示，加入如下设置OK。
set define off;
今天需要修改initrd.img 文件，才发现rhel已经修改文件格式，
采用gz＋cpio的模式，不是原来的gz+ext2文件系统，google
发现如下链接，记录下来：
http://blog.opensource.org.cn/hdcola/2007/09/linux-cpio-initrd.html
在OpenSUSE中使用了2.6 kernel所支持的cpio initrd。我们需要手工更新这个initrd时需要一系列的操作。这里记录下来：
解开一个cpio initrd：
> mkdir work
> cp /boot/initrd.img ./initrd.img.gz
> gunzip -c initrd.img.gz
> cpio -i --make-directories < initrd.img
制作一个cpio initrd
> find . | cpio -c -o > ../initrd.img
> gzip ../initrd.img
http://www.ixpub.net/thread-747567-1-1.html
在机器启动的过程中按F2，之后输入：
linux askmethod vnc vncpassword=password
回车启动，之后显示配置语言，键盘，之后配置网络，配置完网络后出现：
starting vnc...
the vnc server is now running.
please connect to IP:1 to begin the install...
press <enter> for a shell
starting graphical installation
XKB extension not present on :1
然后在另外一个机器上启动vncviewer，登录后就可以看到安装界面了。接着安装即可。
