linux command sfdisk -s & hdparm -t /dev/sdb & tcpdump

[root@rhel5db1 ~]# sfdisk -s

/dev/sda:  10485760

/dev/sdb:  52428800

/dev/sdc:  52428800
total: 115343360 blocks

man sfdisk

  -d     Dump the partitions of a device in a format useful as input to sfdisk. For example,

                  % sfdisk -d /dev/hda > hda.out

                  % sfdisk /dev/hda < hda.out

              will correct the bad last extended partition that the OS/2 fdisk creates.

[root@rhel5db1 ~]#

[root@rhel5db1 ~]#

[root@rhel5db1 ~]#

[root@rhel5db1 ~]#

[root@rhel5db1 ~]# hdparm -t /dev/sdb

/dev/sdb:

 Timing buffered disk reads:  526 MB in  3.00 seconds = 175.17 MB/sec

[root@rhel5db1 ~]# hdparm -t /dev/sda

/dev/sda:

 Timing buffered disk reads:  530 MB in  3.01 seconds = 176.08 MB/sec
[root@rhel5db1 ~]# 

-t   perform device read timings

tcpdump -n

[root@rhel5db1 sysconfig]# lsb_release -a

LSB Version:    :core-4.0-amd64:core-4.0-ia32:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-ia32:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-ia32:printing-4.0-noarch

Distributor ID:    RedHatEnterpriseServer

Description:    Red Hat Enterprise Linux Server release 5.8 (Tikanga)

Release:    5.8

Codename:    Tikanga

ps -axu ##查看每个进程的cpu 和memory的利用率。

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND

root         1  0.0  0.0  10368   692 ?        Ss    2013   0:06 init [5]                                              

root         2  0.0  0.0      0     0 ?        S<    2013   1:43 [migration/0]

root         3  0.0  0.0      0     0 ?        SN    2013   0:01 [ksoftirqd/0]

root         4  0.0  0.0      0     0 ?        S<    2013   1:16 [migration/1]

[root@rhel5db1 home]# blkid  ### 用来查看所有设备的标签和文件系统类型。

/dev/mapper/VolGroup00-LogVol01: TYPE="swap"

/dev/mapper/VolGroup00-LogVol00: UUID="8f4a1b68-4199-41d7-a972-22fd0a2668bf" TYPE="ext3"

/dev/sda1: LABEL="/boot" UUID="5e13425e-0cd6-44be-b8e1-9bfdcefa96e8" TYPE="ext3"

/dev/VolGroup00/LogVol00: UUID="8f4a1b68-4199-41d7-a972-22fd0a2668bf" TYPE="ext3"

/dev/VolGroup00/LogVol01: TYPE="swap"

/dev/sda3: TYPE="reiserfs"

/dev/vg_oracle/lv_ora_prod: UUID="b1025e7c-05d9-429b-a4e8-26b44d8365cd" TYPE="ext3"

/dev/mapper/vg_oracle-lv_ora_prod: UUID="b1025e7c-05d9-429b-a4e8-26b44d8365cd" SEC_TYPE="ext2" TYPE="ext3"

/dev/hdc: LABEL="RHEL/5.8 x86_64 DVD" TYPE="iso9660"

/dev/cdrom: LABEL="RHEL/5.8 x86_64 DVD" TYPE="iso9660"

/dev/sdc1: LABEL="DISK1" TYPE="oracleasm"

ldd命令用于判断某个可执行的 binary 档案含有什么动态函式库。

[julia@oc2365548284 usr]$ which su

/bin/su

[julia@oc2365548284 usr]$ ldd /bin/su

    linux-vdso.so.1 =>  (0x00007fff8d365000)

    libpam.so.0 => /lib64/libpam.so.0 (0x00007fee81291000)

    libpam_misc.so.0 => /lib64/libpam_misc.so.0 (0x00007fee8108d000)

    libc.so.6 => /lib64/libc.so.6 (0x00007fee80cf9000)

    libaudit.so.1 => /lib64/libaudit.so.1 (0x00007fee80add000)

    libdl.so.2 => /lib64/libdl.so.2 (0x00007fee808d9000)

    libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007fee806a1000)

    /lib64/ld-linux-x86-64.so.2 (0x0000003a14e00000)

    libfreebl3.so => /lib64/libfreebl3.so (0x00007fee80435000)

[julia@oc2365548284 usr]$

安装启动引导程序

grub

root (hd0,0)

setup (hd0)

root (hd1,0)

setup (hd0)

增强grub的引导文件

vi /root/grub/grub.conf