view filesystem information
dennis@dennis:~$ sudo su
[sudo] password for dennis:
root@dennis:/home/dennis# fdisk -l
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x000ee377
Device Boot Start End Blocks Id System
/dev/sda1 * 1026048 1230847 102400 7 HPFS/NTFS/exFAT
/dev/sda2 1230848 210741247 104755200 7 HPFS/NTFS/exFAT
/dev/sda3 210741248 860366847 324812800 7 HPFS/NTFS/exFAT
/dev/sda4 860368894 1953523711 546577409 5 Extended
Partition 4 does not start on physical sector boundary.
/dev/sda5 860368896 1937033215 538332160 83 Linux
/dev/sda6 1937035264 1953523711 8244224 82 Linux swap / Solaris
root@dennis:/home/dennis# tune2fs -l /dev/sda1
tune2fs 1.42 (29-Nov-2011)
tune2fs: Bad magic number in super-block while trying to open /dev/sda1
Couldn't find valid filesystem superblock.
root@dennis:/home/dennis# tune2fs -l /dev/sda6
tune2fs 1.42 (29-Nov-2011)
tune2fs: Bad magic number in super-block while trying to open /dev/sda6
Couldn't find valid filesystem superblock.
root@dennis:/home/dennis# tune2fs -l /dev/sda5
tune2fs 1.42 (29-Nov-2011)
Filesystem volume name: <none>
Last mounted on: /
Filesystem UUID: cab5dcf8-904f-4f53-a2f8-25276e38f84d
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags: signed_directory_hash
Default mount options: user_xattr acl
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 33652736
Block count: 134583040
Reserved block count: 6729152
Free blocks: 112706967
Free inodes: 33202652
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 991
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 8192
Inode blocks per group: 512
Flex block group size: 16
Filesystem created: Thu Mar 27 19:19:17 2014
Last mount time: Sat Aug 9 13:51:31 2014
Last write time: Wed Apr 9 11:19:12 2014
Mount count: 94
Maximum mount count: -1
Last checked: Thu Mar 27 19:19:17 2014
Check interval: 0 (<none>)
Lifetime writes: 174 GB
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 256
Required extra isize: 28
Desired extra isize: 28
Journal inode: 8
First orphan inode: 18089038
Default directory hash: half_md4
Directory Hash Seed: d4c17cf0-bb57-4423-81ab-a8fc3df1bc13
Journal backup: inode blocks
Terminology
The block size is the unit of work for the file system. Every read and write is
done in full multiples of the block size. The block size is also the smallest
size on disk a file can have.
Optimal
1.Inode block
2.Reserved block
Mkfs.ext3 –b 4096 - i 8192 –m 2 /dev/sda5
3.tune2fs
dennis@dennis:~$ tune2fs
tune2fs 1.42 (29-Nov-2011)
Usage: tune2fs [-c max_mounts_count] [-e errors_behavior] [-g group]
[-i interval[d|m|w]] [-j] [-J journal_options] [-l]
[-m reserved_blocks_percent] [-o [^]mount_options[,...]] [-p mmp_update_interval]
[-r reserved_blocks_count] [-u user] [-C mount_count] [-L volume_label]
[-M last_mounted_dir] [-O [^]feature[,...]]
[-E extended-option[,...]] [-T last_check_time] [-U UUID]
[ -I new_inode_size ] device
use tune2fs -l /dev/sda5 to view filesystem information
use tune2fs -c -1 /dev/sda5 to avoid selfcheck
use tune2fs -c -1 -i 0 /dev/sda5 to set the interval time
use tune2fs -m 3 /dev/sda5 to set the reserved_blocks_percent