Disk /dev/sdb: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdc: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdd: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sde: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-root: 13.0 GB, 13002342400 bytes, 25395200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-swap: 4001 MB, 4001366016 bytes, 7815168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
[root@sudhir log]# clear
[root@sudhir log]# fdisk -l | more
Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x0009660b
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 976895 487424 83 Linux
/dev/sda2 976896 34203647 16613376 8e Linux LVM
Disk /dev/sdb: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdc: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdd: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sde: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-root: 13.0 GB, 13002342400 bytes, 25395200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-swap: 4001 MB, 4001366016 bytes, 7815168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
[root@sudhir log]# echo "- - -" >/sys/
block/ bus/ class/ dev/ devices/ firmware/ fs/ hypervisor/ kernel/ module/
power/
[root@sudhir log]# echo "- - -" >/sys/class/
ata_device/ block/ dmi/ input/ misc/ powercap/ rtc/ sound/ vc/
ata_link/ bluetooth/ graphics/ iommu/ msr/ power_supply/ scsi_device/ thermal/
vtconsole/
ata_port/ bsg/ hidraw/ leds/ net/ ppdev/ scsi_disk/ tpm/
watchdog/
backlight/ cpuid/ hwmon/ mdio_bus/ pci_bus/ raw/ scsi_generic/ tty/
bdi/ dma/ i2c-adapter/ mem/ pcmcia_socket/ rfkill/ scsi_host/ usbmon/
[root@sudhir log]# echo "- - -" >/sys/class/scsi_host/host
host0/ host1/ host2/ host3/ host4/ host5/ host6/
[root@sudhir log]# echo "- - -" >/sys/class/scsi_host/host0/scan
[root@sudhir log]# echo "- - -" >/sys/class/scsi_host/host1/scan
[root@sudhir log]# echo "- - -" >/sys/class/scsi_host/host[0-6]/scan
-bash: /sys/class/scsi_host/host[0-6]/scan: ambiguous redirect
[root@sudhir log]# fdisk -l
Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x0009660b
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 976895 487424 83 Linux
/dev/sda2 976896 34203647 16613376 8e Linux LVM
Disk /dev/sdb: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdc: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sdd: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/sde: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-root: 13.0 GB, 13002342400 bytes, 25395200 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-swap: 4001 MB, 4001366016 bytes, 7815168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
[root@sudhir log]# man fdisk
[root@sudhir log]# fdisk -cu /dev/sdb
Usage:
fdisk [options] <disk> change partition table
fdisk [options] -l <disk> list partition table(s)
fdisk -s <partition> give partition size(s) in blocks
Options:
-b <size> sector size (512, 1024, 2048 or 4096)
-c[=<mode>] compatible mode: 'dos' or 'nondos' (default)
-h print this help text
-u[=<unit>] display units: 'cylinders' or 'sectors' (default)
-v print program version
-C <number> specify the number of cylinders
-H <number> specify the number of heads
-S <number> specify the number of sectors per track
[root@sudhir log]# fdisk -c /dev/sdb
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x165fd3f0.
Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
g create a new empty GPT partition table
G create an IRIX (SGI) partition table
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-4194303, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-4194303, default 4194303): +500M
Partition 1 of type Linux and of size 500 MiB is set
Command (m for help): p
Disk /dev/sdb: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x165fd3f0
Device Boot Start End Blocks Id System
/dev/sdb1 2048 1026047 512000 83 Linux
Command (m for help): n
Partition type:
p primary (1 primary, 0 extended, 3 free)
e extended
Select (default p):
Using default response p
Partition number (2-4, default 2):
First sector (1026048-4194303, default 1026048): +500M
Value out of range.
First sector (1026048-4194303, default 1026048):
Using default value 1026048
Last sector, +sectors or +size{K,M,G} (1026048-4194303, default 4194303): +500M
Partition 2 of type Linux and of size 500 MiB is set
Command (m for help): p
Disk /dev/sdb: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x165fd3f0
Device Boot Start End Blocks Id System
/dev/sdb1 2048 1026047 512000 83 Linux
/dev/sdb2 1026048 2050047 512000 83 Linux
Command (m for help): n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p):
Using default response p
Partition number (3,4, default 3):
First sector (2050048-4194303, default 2050048):
Using default value 2050048
Last sector, +sectors or +size{K,M,G} (2050048-4194303, default 4194303): +500M
Partition 3 of type Linux and of size 500 MiB is set
Command (m for help): p
Disk /dev/sdb: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x165fd3f0
Device Boot Start End Blocks Id System
/dev/sdb1 2048 1026047 512000 83 Linux
/dev/sdb2 1026048 2050047 512000 83 Linux
/dev/sdb3 2050048 3074047 512000 83 Linux
Command (m for help): n
Partition type:
p primary (3 primary, 0 extended, 1 free)
e extended
Select (default e): p
Selected partition 4
First sector (3074048-4194303, default 3074048):
Using default value 3074048
Last sector, +sectors or +size{K,M,G} (3074048-4194303, default 4194303):
Using default value 4194303
Partition 4 of type Linux and of size 547 MiB is set
Command (m for help): p
Disk /dev/sdb: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x165fd3f0
Device Boot Start End Blocks Id System
/dev/sdb1 2048 1026047 512000 83 Linux
/dev/sdb2 1026048 2050047 512000 83 Linux
/dev/sdb3 2050048 3074047 512000 83 Linux
/dev/sdb4 3074048 4194303 560128 83 Linux
Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
g create a new empty GPT partition table
G create an IRIX (SGI) partition table
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@sudhir log]# fdisk -l /dev/sdb
Disk /dev/sdb: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x165fd3f0
Device Boot Start End Blocks Id System
/dev/sdb1 2048 1026047 512000 83 Linux
/dev/sdb2 1026048 2050047 512000 83 Linux
/dev/sdb3 2050048 3074047 512000 83 Linux
/dev/sdb4 3074048 4194303 560128 83 Linux
[root@sudhir log]# mkf
mkfifo mkfontscale mkfs.btrfs mkfs.ext2 mkfs.ext4 mkfs.minix mkfs.vfat
mkfontdir mkfs mkfs.cramfs mkfs.ext3 mkfs.fat mkfs.msdos mkfs.xfs
[root@sudhir log]# mkfs.ext4 /dev/sdb1
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
128016 inodes, 512000 blocks
25600 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=34078720
63 block groups
8192 blocks per group, 8192 fragments per group
2032 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409
Allocating group tables: done
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done
[root@sudhir log]# blkid /dev/sdb1
/dev/sdb1: UUID="7402cab0-0779-4a86-a296-03bc11f516ec" TYPE="ext4"
[root@sudhir log]# mkfs.ext4 /dev/sdb2
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
128016 inodes, 512000 blocks
25600 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=34078720
63 block groups
8192 blocks per group, 8192 fragments per group
2032 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409
Allocating group tables: done
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done
[root@sudhir log]# mkfs.xfs /dev/sdb3
meta-data=/dev/sdb3 isize=256 agcount=4, agsize=32000 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=128000, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal log bsize=4096 blocks=853, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@sudhir log]# blkid /dev/sdb1
/dev/sdb1: UUID="7402cab0-0779-4a86-a296-03bc11f516ec" TYPE="ext4"
[root@sudhir log]# blkid /dev/sdb2
/dev/sdb2: UUID="a321821b-8679-482f-99bd-95065ab0f3b3" TYPE="ext4"
[root@sudhir log]# blkid /dev/sdb3
/dev/sdb3: UUID="e26bb181-1823-42b8-a860-f08bf2e93fc7" TYPE="xfs"
[root@sudhir log]# pwd
/var/log
[root@sudhir log]# mkdir /dir1 /dir2 /dir3
[root@sudhir log]# mv /dir3 /opt
[root@sudhir log]# pwd
/var/log
[root@sudhir log]# mount /dev/sdb1 /dir1
[root@sudhir log]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 13G 6.5G 5.7G 54% /
devtmpfs 906M 0 906M 0% /dev
tmpfs 921M 100K 920M 1% /dev/shm
tmpfs 921M 8.8M 912M 1% /run
tmpfs 921M 0 921M 0% /sys/fs/cgroup
/dev/sda1 473M 156M 318M 33% /boot
tmpfs 185M 12K 184M 1% /run/user/1000
tmpfs 185M 0 185M 0% /run/user/0
/dev/sdb1 477M 2.3M 445M 1% /dir1
[root@sudhir log]# cd /dir1
[root@sudhir dir1]# ls
lost+found
[root@sudhir dir1]# pwd
/dir1
[root@sudhir dir1]# df -h .
Filesystem Size Used Avail Use% Mounted on
/dev/sdb1 477M 2.3M 445M 1% /dir1
[root@sudhir dir1]# cd ../dir2
[root@sudhir dir2]# ls
[root@sudhir dir2]# ls -l
total 0
[root@sudhir dir2]# df -h .
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 13G 6.5G 5.7G 54% /
[root@sudhir dir2]# pwd
/dir2
[root@sudhir dir2]# cd /dir1
[root@sudhir dir1]# pwd
/dir1
[root@sudhir dir1]# touch this is a file system
[root@sudhir dir1]# ls -l
total 17
-rw-r--r--. 1 root root 0 Apr 23 10:26 a
-rw-r--r--. 1 root root 0 Apr 23 10:26 file
-rw-r--r--. 1 root root 0 Apr 23 10:26 is
drwx------. 2 root root 12288 Apr 23 10:19 lost+found
-rw-r--r--. 1 root root 0 Apr 23 10:26 system
-rw-r--r--. 1 root root 0 Apr 23 10:26 this
[root@sudhir dir1]# pwd
/dir1
[root@sudhir dir1]# cd ..
[root@sudhir /]# df -h /dir1
Filesystem Size Used Avail Use% Mounted on
/dev/sdb1 477M 2.3M 445M 1% /dir1
[root@sudhir /]# umount /dir1
[root@sudhir /]# df -h /dir1
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 13G 6.5G 5.7G 54% /
[root@sudhir /]# cd dir1
[root@sudhir dir1]# ls -l
total 0
[root@sudhir dir1]# mount /dev/sdb1 /dir2
[root@sudhir dir1]# cd dir2
-bash: cd: dir2: No such file or directory
[root@sudhir dir1]# cd /dir2
[root@sudhir dir2]# ls
a file is lost+found system this
[root@sudhir dir2]# ls -l
total 17
-rw-r--r--. 1 root root 0 Apr 23 10:26 a
-rw-r--r--. 1 root root 0 Apr 23 10:26 file
-rw-r--r--. 1 root root 0 Apr 23 10:26 is
drwx------. 2 root root 12288 Apr 23 10:19 lost+found
-rw-r--r--. 1 root root 0 Apr 23 10:26 system
-rw-r--r--. 1 root root 0 Apr 23 10:26 this
[root@sudhir dir2]# df -h .
Filesystem Size Used Avail Use% Mounted on
/dev/sdb1 477M 2.3M 445M 1% /dir2
[root@sudhir dir2]# cd /dir1
[root@sudhir dir1]# ls
[root@sudhir dir1]# ls -l /etc/fstab
-rw-r--r--. 1 root root 465 Feb 3 19:24 /etc/fstab
[root@sudhir dir1]# vi /etc/fstab
[root@sudhir dir1]# cp -p /etc/fstab /etc/fstab.04232016
[root@sudhir dir1]# vi /etc/fstab
[root@sudhir dir1]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 13G 6.5G 5.7G 54% /
devtmpfs 906M 0 906M 0% /dev
tmpfs 921M 100K 920M 1% /dev/shm
tmpfs 921M 8.8M 912M 1% /run
tmpfs 921M 0 921M 0% /sys/fs/cgroup
/dev/sda1 473M 156M 318M 33% /boot
tmpfs 185M 12K 184M 1% /run/user/1000
tmpfs 185M 0 185M 0% /run/user/0
/dev/sdb1 477M 2.3M 445M 1% /dir2
[root@sudhir dir1]# ls -ld /opt/dir3
drwxr-xr-x. 2 root root 6 Apr 23 10:22 /opt/dir3
[root@sudhir dir1]# ls -l /opt/dir3
total 0
[root@sudhir dir1]# mount -a
[root@sudhir dir1]# echo $?
0
[root@sudhir dir1]# ls -l /opt/dir3
total 12
drwx------. 2 root root 12288 Apr 23 10:20 lost+found
[root@sudhir dir1]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 13G 6.5G 5.7G 54% /
devtmpfs 906M 0 906M 0% /dev
tmpfs 921M 100K 920M 1% /dev/shm
tmpfs 921M 8.8M 912M 1% /run
tmpfs 921M 0 921M 0% /sys/fs/cgroup
/dev/sda1 473M 156M 318M 33% /boot
tmpfs 185M 12K 184M 1% /run/user/1000
tmpfs 185M 0 185M 0% /run/user/0
/dev/sdb1 477M 2.3M 445M 1% /dir2
/dev/sdb2 477M 2.3M 445M 1% /opt/dir3
[root@sudhir dir1]# mount /dev/sdb1 /dir1
[root@sudhir dir1]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 13G 6.5G 5.7G 54% /
devtmpfs 906M 0 906M 0% /dev
tmpfs 921M 100K 920M 1% /dev/shm
tmpfs 921M 8.8M 912M 1% /run
tmpfs 921M 0 921M 0% /sys/fs/cgroup
/dev/sda1 473M 156M 318M 33% /boot
tmpfs 185M 12K 184M 1% /run/user/1000
tmpfs 185M 0 185M 0% /run/user/0
/dev/sdb1 477M 2.3M 445M 1% /dir2
/dev/sdb2 477M 2.3M 445M 1% /opt/dir3
[root@sudhir dir1]# cd /dir1
[root@sudhir dir1]# ls
a file is lost+found system this
[root@sudhir dir1]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 13G 6.5G 5.7G 54% /
devtmpfs 906M 0 906M 0% /dev
tmpfs 921M 100K 920M 1% /dev/shm
tmpfs 921M 8.8M 912M 1% /run
tmpfs 921M 0 921M 0% /sys/fs/cgroup
/dev/sda1 473M 156M 318M 33% /boot
tmpfs 185M 12K 184M 1% /run/user/1000
tmpfs 185M 0 185M 0% /run/user/0
/dev/sdb1 477M 2.3M 445M 1% /dir2
/dev/sdb2 477M 2.3M 445M 1% /opt/dir3
[root@sudhir dir1]# umount /dir2
[root@sudhir dir1]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 13G 6.5G 5.7G 54% /
devtmpfs 906M 0 906M 0% /dev
tmpfs 921M 100K 920M 1% /dev/shm
tmpfs 921M 8.8M 912M 1% /run
tmpfs 921M 0 921M 0% /sys/fs/cgroup
/dev/sda1 473M 156M 318M 33% /boot
tmpfs 185M 12K 184M 1% /run/user/1000
tmpfs 185M 0 185M 0% /run/user/0
/dev/sdb2 477M 2.3M 445M 1% /opt/dir3
/dev/sdb1 477M 2.3M 445M 1% /dir1
[root@sudhir dir1]# vi /etc/fstab
[root@sudhir dir1]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 13G 6.5G 5.7G 54% /
devtmpfs 906M 0 906M 0% /dev
tmpfs 921M 100K 920M 1% /dev/shm
tmpfs 921M 8.8M 912M 1% /run
tmpfs 921M 0 921M 0% /sys/fs/cgroup
/dev/sda1 473M 156M 318M 33% /boot
tmpfs 185M 12K 184M 1% /run/user/1000
tmpfs 185M 0 185M 0% /run/user/0
/dev/sdb2 477M 2.3M 445M 1% /opt/dir3
/dev/sdb1 477M 2.3M 445M 1% /dir1
[root@sudhir dir1]# mount -a
[root@sudhir dir1]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 13G 6.5G 5.7G 54% /
devtmpfs 906M 0 906M 0% /dev
tmpfs 921M 100K 920M 1% /dev/shm
tmpfs 921M 8.8M 912M 1% /run
tmpfs 921M 0 921M 0% /sys/fs/cgroup
/dev/sda1 473M 156M 318M 33% /boot
tmpfs 185M 12K 184M 1% /run/user/1000
tmpfs 185M 0 185M 0% /run/user/0
/dev/sdb2 477M 2.3M 445M 1% /dir2
/dev/sdb1 477M 2.3M 445M 1% /dir1
[root@sudhir dir1]# vi /etc/fstab
[root@sudhir dir1]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 13G 6.5G 5.7G 54% /
devtmpfs 906M 0 906M 0% /dev
tmpfs 921M 100K 920M 1% /dev/shm
tmpfs 921M 8.8M 912M 1% /run
tmpfs 921M 0 921M 0% /sys/fs/cgroup
/dev/sda1 473M 156M 318M 33% /boot
tmpfs 185M 12K 184M 1% /run/user/1000
tmpfs 185M 0 185M 0% /run/user/0
/dev/sdb2 477M 2.3M 445M 1% /dir2
/dev/sdb1 477M 2.3M 445M 1% /dir1
[root@sudhir dir1]# mount -a
[root@sudhir dir1]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 13G 6.5G 5.7G 54% /
devtmpfs 906M 0 906M 0% /dev
tmpfs 921M 100K 920M 1% /dev/shm
tmpfs 921M 8.8M 912M 1% /run
tmpfs 921M 0 921M 0% /sys/fs/cgroup
/dev/sda1 473M 156M 318M 33% /boot
tmpfs 185M 12K 184M 1% /run/user/1000
tmpfs 185M 0 185M 0% /run/user/0
/dev/sdb3 497M 26M 472M 6% /opt/dir3
/dev/sdb1 477M 2.3M 445M 1% /dir1
/dev/sdb2 477M 2.3M 445M 1% /dir2
[root@sudhir dir1]# reboot
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