Centos 6.5 Mount HDD 4K alignment (notes measured)

Environment:

System hardware: VMware vsphere (cpu:2*4 core, memory 2G)

System version: Linux CentOS 2.6.32-431.17.1.el6.x86_64 (Centos-6.5-x86_64-minimal.iso)

Hard drive to mount:/dev/sdb

Upgrade steps:

0. System Environment

[Email protected] ~]# uname-r

2.6.32-431.17.1.el6.x86_64

[Email protected] ~]# cat/etc/redhat-release

CentOS Release 6.5 (Final)

1. View current Mount Information

[Email protected] ~]# df-h

Filesystem Size used Avail use% mounted on
/dev/mapper/volgroup-lv_root 14G 884M 13G 7%/
Tmpfs 939M 0 939M 0%/dev/shm
/DEV/SDA1 485M 54M 407M 12%/boot

2. View hard drive information (see/DEV/SDB for this new drive)
... Slightly

disk/dev/sdb:32.2 GB, 32212254720 bytes
255 heads, Sectors/track, 3916 cylinders, total 62914560 sectors
Units = sectors of 1 * MB = bytes
Sector size (logical/physical): bytes/512 bytes
I/O size (minimum/optimal): bytes/512 bytes
Disk Identifier:0xb819ae09

Device Boot Start End Blocks Id System
　　

... Slightly

3. Hard disk partition and 4K alignment

[Email protected] ~]# fdisk-h 224-s 56/dev/sdb

Warning:dos-compatible mode is deprecated. It ' s strongly recommended to
Switch off the mode (command ' C ') and change display units to
Sectors (Command ' u ').

Command (M for help):
　　

3.1 First zone operation, follow these steps

N P 1 return car +10g return

3.2 First zone operation, follow these steps

N P 2 return car +5g return

3.1 First zone operation, follow these steps

N P 3 return car return

3.4 Save exit

W

4. View hard drive information (see/DEV/SDB for this new drive)

[Email protected] ~]# Fdisk-lu

... Slightly
disk/dev/sdb:32.2 GB, 32212254720 bytes
224 heads, Sectors/track, 5015 cylinders, total 62914560 sectors< br> Units = sectors of 1 * = bytes
Sector size (logical/physical): bytes/512 bytes
I/o size (mini Mum/optimal): bytes/512 bytes
Disk identifier:0xb819ae09

   Device boot   &nb sp;  start         end      Blocks    id  System
/dev/sdb1               56    20986111    10493028   83  Linux
/dev/sdb2         20986112    31485439     5249664   83   Linux
/dev/sdb3        31485440    62908159     15711360   83  Linux

... Slightly

　　

The start of each partition is divisible by 8, which means that the partition is 4K aligned

5. Format, create partition file system

[Email protected] ~]# MKFS.EXT4/DEV/SDB1

[Email protected] ~]# MKFS.EXT4/DEV/SDB2

[Email protected] ~]# MKFS.EXT4/DEV/SDB3

6. Mount Partitions

6.1 Need to save the attached directory real existence

[Email protected] ~]# mkdir-p/data

6.2 Modify the file so that you can mount the directory to the partition if you restart it

[Email protected] ~]# Vim/etc/fstab

Echo '/dev/sdb1/home ext4 defaults 0 0 '

Echo '/dev/sdb2/data ext4 defaults 0 0 '

Echo '/dev/sdb3/tmp ext4 defaults 0 0 '

Save exit

6.3 Mount Partition

[Email protected] ~]# mount-a

　　

7. Rebooting the system

[Email protected] ~]# Shutdown-r now

　　

8. View the partition Mount information

[Email protected] ~]# DF-LH

filesystem            Size  Used Avail Use% Moun Ted on
/dev/mapper/volgroup-lv_root 14g  884m   13g   7%/
/dev/sda1    ;          485m   54m  407M  12%/boot
Tmpfs                  939m      0  939m   0%/dev/shm
/dev/sdb1              9.9g  151m  9.3g   2%/home
/DEV/SDB2&NBSP;&NBSP;&NBSP;&NB sp;         5.0g  139m  4.6g   3%/tmp
/dev/sdb3& nbsp;             15G  166M   14G  ;  2%/data

9. View Partition Read speed

Time DD If=/dev/zero of=/data/test.file bs=1m count=500

Centos 6.5 Mount HDD 4K alignment (notes measured)