Linux Hard disk operation documentary

This paper mainly records my operations in the operation of the work of a hard disk.

Environment:

This server is a Hadoop slavenode, which has 12 disks, each disk made only one partition, not do LVM.

Fault Detection:

After boarding the server, we find that a disk is missing:

#df-H

Filesystem Size used Avail use% mounted on

/dev/sda2 451G 20G 408G 5%/

Tmpfs 36G 0 36G 0%/dev/shm

/DEV/SDB1 1.9T 1.5T 354G 81%/HADOOP/1

/DEV/SDC1 1.9T 1.5T 357G 81%/HADOOP/2

/DEV/SDD1 1.9T 1.5T 351G 81%/HADOOP/3

/dev/sde1 1.9T 1.4T 402G 79%/HADOOP/4

/DEV/SDF1 1.9T 1.5T 371G 80%/HADOOP/5

/DEV/SDG1 1.9T 1.5T 375G 80%/HADOOP/6

/DEV/SDH1 1.9T 1.5T 388G 79%/HADOOP/7

/dev/sdi1 1.9T 1.5T 383G 80%/HADOOP/8

/dev/sdj1 1.9T 1.5T 394G 79%/HADOOP/9

/DEV/SDL1 1.9T 1.5T 377G 80%/HADOOP/11

/DEV/SDM1 1.9T 1.5T 386G 79%/HADOOP/12

Careful observation will find/HADOOP/10 no, the corresponding should be/dev/sdk1, that hard drive where to go?

Fault Analysis:

View with Fdisk:

#fdisk-L/DEV/SDK

Found this disk is GPT table, here interspersed with the small knowledge of the partition table, partition table most commonly used is mbr,gpt is a relatively new one, less useful.

Because other hard disks are MBR partitioned tables, this hard drive should also be MBR, which is estimated to be caused by a mistake by someone.

Fault resolution:

-delete the original partition table information with FDISK and create a new partition:

#fdisk/DEV/SDK

-Use the parted tool to convert the Partition1 partition table to MBR:

#parted/dev/sdk1#mklabel Msdos#quit

-delete reserved 5% of the disk space:

#tune2fs-M 0/DEV/SDK1

-Format the partition with EXT4:

#mkfs. Ext4/dev/sdk1

-View disk information:

#fdisk-L/DEV/SDK

disk/dev/sdk:2000.4 GB, 2000398934016 bytes

255 heads, Sectors/track, 243201 cylinders

Units = Cylinders of 16065 * 8225280 bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512 bytes

Disk Identifier:0xea6649b8

Device Boot Start End Blocks Id System

/DEV/SDK1 1 243201 1953512001 Linux

-All normal, view/etc/fstab:

.......

LABEL=/HADOOP09/HADOOP/9 ext4 Defaults,noatime,nodiratime,noauto 0 2

LABEL=/HADOOP10/HADOOP/10 ext4 Defaults,noatime,nodiratime,noauto 0 2

........

Implementation

#mount-A

-again with Fdisk to see, how still no mount. Decide to manually mount one time:

#mount Label=/hadoop10/hadoop/10-o defaults,noatime,nodiratime,noauto-t Ext4

-Again with Fdisk view, incredibly good:

#df-H

......

/dev/sdk1 1.8T 1.9G 1.8T 1%/HADOOP/10

Feelings:

Sometimes really can't believe mount-a, have time to look at its source code, see how it works.

This article from the "Linux and Network" blog, reproduced please contact the author!

Linux hard disk operation record