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出自：http://www.idevelopment.info/data/Unix/Solaris/SOLARIS_UnderstandingDiskDeviceFiles.shtml

Understanding Disk Device Files (i.e. breaking down c0t2d0s7)

by Jeff Hunter, Sr. Database Administrator

Overview

Under Solaris, one of the most involved UNIX devices to understand is the disk device file. Here are several key points that may help:

• 
  
• In many cases, a disk device file (i.e. /dev/dsk/c0t2d0s7) refers to a particular partition (aka "slice") of a disk, and not the entire physical device. There are several device files which refer to the entire physical device, but are rarely used.
  
  
• For every disk device, there are usually two device files - the block device and the character ("raw") device. In general:
  
  • 
    
  • block devices are generally stored under /dev/dsk and used for filesystem type access (e.g mount)
    
  • character devices are generally stored under /dev/rdsk used for everything else (e.g. fsck, newfs, etc..)
  
  
  
• Discs are generally attached to a controller (or a bus) which can handle multiple devices. IDE and SCSI are both common attach methods. This tends to make disk device filename more complex than other types of devices.

/etc/vfstab

To see the difference between the block device and character device for a device, consider the following. The /etc/vfstab contains entries for a single filesystem on a Solaris server:

/dev/dsk/c0t2d0s7 /dev/rdsk/c0t2d0s7 /opt ufs 3 yes - 

The first 2 fields in the above entry, list the same disk device as both a block device ("dsk") and character device ("rdsk"). The block device is used by mount when mounting the filesystem while the character device is used by fsck when checking the filesystem and newfs when creating the filesystem.. Both fields must be present in /etc/vfstab.

Breaking Down c0t2d0s7

This section breaks down the different components of a disk device file. In this example, I will be using the disk device file: c0t2d0s7. The four components of the disk device file are: controller, target, LUN and slice/partition and further defined in the following table:

c0	This device is attached to controller #0. On a SPARCstation this is usually the on-board SCSI or IDE controller. If this is a PC it usually refers to the first IDE controller on the motherboard.
t2	The device is target #2 - (i.e. the second device on this controller.) On a SCSI controller this is the SCSI target ID and is usually set via a switch on any external enclosure or by jumpers on the disk itself. On an IDE controller target #2 refers to the second IDE disk. With IDE this is generally determined by the device's position on the IDE cable.
d0	The device is Logical Unit / "LUN" #0 (the first) on this target. Under SCSI a single target can support up-to eight devices. This is rarely seen in practice, but some hardware raid controllers use LUNs.
s7	Slice or Partition number 7. Under Solaris, this relates to the partition number as set when using the format command.

默认情况下.Solaris10安装完成后.启动是cde界面.但有时用xmanager登录时始终无法建立连接. 如果确认不是防火墙等方面的原因.可以用如下方法解决
      
      1. 关闭默认的cde服务
          svcadm disable cde-login
          用ps-ef|grep dtlogin 应该看不到dtlogin进程了
      2. 进入/etc/X11/gdm
          编辑gdm.conf文件 编辑如下2个地方
         
         找到[xdmcp]字段.
         将Enable=flase改为true
         将Port=177前的注释取消
         
         然后保存退出.
       3.ps-ef|grep gdm 确认目前没有gdm进程.如有杀之
       4. 启动gdm服务

       # svcs -a|grep gdm
disabled       Aug_07   svc:/application/gdm2-login:default
# svcadm enable svc:/application/gdm2-login:default

然后在xmanager里建立新连接. 这样就可以登录了. 在登录界面的左上角选择cde.熟悉的cde界面就又回来了

# Oct 6 14:11:06 nibappsun08 sendmail[9825]: [ID 702911 mail.alert] unable to q
ualify my own domain name (nibappsun0 -- using short name

root@blade ~# svcs -l svc:/network/smtp:sendmail
fmri         svc:/network/smtp:sendmail
name         sendmail SMTP mail transfer agent
enabled      true
state        online
next_state   none
state_time   Fri Jun 06 01:15:58 2008
logfile      /var/svc/log/network-smtp:sendmail.log
restarter    svc:/system/svc/restarter:default
contract_id  142
dependency   require_all/refresh file://localhost/etc/mail/sendmail.cf (online)
dependency   require_all/refresh file://localhost/etc/nsswitch.conf (online)
dependency   optional_all/none svc:/system/filesystem/autofs (online)
dependency   require_all/none svc:/system/filesystem/local (online)
dependency   require_all/none svc:/network/service (online)
dependency   require_all/refresh svc:/milestone/name-services (online)
dependency   optional_all/refresh svc:/system/identity:domain (online)
dependency   optional_all/none svc:/system/system-log (online)
root@blade ~ #

root@blade ~ # ps -ef|grep sendmail
root  2669     1   0 01:16:59 ?           0:00 /usr/lib/sendmail -bd -q15m -C /etc/mail/local.cf
smmsp  2667     1   0 01:16:59 ?           0:00 /usr/lib/sendmail -Ac -q15m
root  2950  2788   0 01:56:18 pts/1       0:00 grep sendmail
root@blade ~ # svcadm disable svc:/network/smtp:sendmail
root@blade ~ # ps -ef | grep sendmail
root@blade ~ #

root@blade ~ # hostname
blade
root@blade ~ # hostname blade.example.com
root@blade ~ # hostname
blade.example.com
root@blade ~ #

root@blade ~ # echo "example.com" > /etc/defaultdomain
root@blade ~ # cat /etc/defaultdomain
example.com
root@blade ~ #

root@blade ~ # domainname example.com
root@blade ~ # domainname
example.com
root@blade ~ #

#
# Internet host table
#
::1     localhost
127.0.0.1       localhost
192.168.1.200   blade   loghost

#
# Internet host table
#
::1     localhost
127.0.0.1       localhost
192.168.1.200   blade.example.com blade loghost

GENERATING AND USING SSH KEYS
       1 Generate keys
           Type:

              ssh-keygen -t rsa

           And do not enter a passphrase unless you wanted to be prompted for one during file copying.

           Here is what you will see:

              $ ssh-keygen -t rsa
              Generating public/private rsa key pair.
              Enter file in which to save the key (/home/User/.ssh/id_rsa):
              Enter passphrase (empty for no passphrase):

              Enter same passphrase again:

              Your identification has been saved in /home/User/.ssh/id_rsa.
              Your public key has been saved in /home/User/.ssh/id_rsa.pub.
              The key fingerprint is:
              5a:cd:2b:0a:cd:d9:15:85:26:79:40:0c:55:2a:f4:23 User@JEFF-CPU

       2 Copy public to machines you want to upload to
           "id_rsa.pub" is your public key. Copy it to "~/.ssh" on target machine.

           Put a copy of the public key file on each machine you want to log into.  Name the copy "authorized_keys" (some imple-
           mentations name this file "authorized_keys2")

           Then type:

                chmod 600 authorized_keys

           Then make sure your home dir on the remote machine is not group or world writeable.

在安装rrdtool这个画图工具的时候经常报错，安装官方的libs搞半天有时候还过不去！

下面介绍两种方法,可以搞定.我是用第二中方法安装成功的。

第一种方法：
1.通过yum源自动安装rrdtool
# vi /etc/yum.repos.d/dag.repo
[dag]
name=Dag RPM Repository for Red Hat Enterprise Linux
baseurl=http://apt.sw.be/redhat/el$releasever/en/$basearch/dag
gpgcheck=1
gpgkey=http://dag.wieers.com/rpm/packages/RPM-GPG-KEY.dag.txt
enabled=1
#rpm --import http://dag.wieers.com/rpm/packages/RPM-GPG-KEY.dag.txt

搞定后，直接yum安装如下:
#yum install rrdtool
即可安装成功.

第二种方法:
2.通过编译安装rrdtool
先通过yum安装基本的包和库文件：
# yum install cairo-devel libxml2-devel pango-devel pango libpng-devel freetype freetype-devel libart_lgpl-devel
# wget http://oss.oetiker.ch/rrdtool/pub/rrdtool-1.3.1.tar.gz
# tar -zxvf rrdtool-1.3.1.tar.gz

configure && make &&make install





#!/usr/bin/perl -w
# This script fetches data from target.rrd, creates a graph of memory
# consumption on the target (Dual P3 Processor 1 GHz, 656 MB RAM)

# call the RRD perl module
use lib qw( /usr/local/rrdtool-1.0.41/lib/perl ../lib/perl );
use RRDs;

Understanding write-cache mode for logical drive :
http://publib.boulder.ibm.com/infocenter/eserver/v1r2/index.jsp?topic=/diricinfo/fqy0_cwrcache.html

Understanding write-cache mode for logical drives

#!/usr/bin/perl -w

use strict;
use IO: ir;
use File: ath;

my $dir="/home/g/e/dfsdfs/test";
my $dir_fh=IO: ir->new($dir);
while (defined(my $file=$dir_fh->read)) {
        my $dir_f=IO: ir->new("$dir/$file");
        while (defined(my $fil=$dir_f->read)) {
                rmtree ("$dir/$file/$fil",{ verbose => 1 }) if $fil=~/2009/;
        }
}




,{ verbose => 1 } 可删除







增加目录：



#!/usr/bin/perl -w

use strict;

my @list = (1 .. 9);
my @FA=("1".."2000");
sub mk_fa {
        my ($f) = @_;
        foreach my $p (@list) {
               mkdir "/savedata/data0$p/NRU/$f",0755 or warn "mkdir /savedata/data0$p/NRU/$f err:$!";
               symlink "/savedata/data0$p/NRU/$f","/usr/local/Titan/NRU/$f" or warn "symlink /data$p/NRU/$f err:$!";
               shift @list;
               last;
        }
}
foreach my $fa (@FA) {
       @list=1..9 unless @list;
       $mk_fa($fa);
}