Difference between revisions of "Mkfs.ext4"

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(→‎Activities: # Learn about Lazy initialization feature of ext4: https://www.thomas-krenn.com/en/wiki/Ext4_Filesystem#Lazy_Initialization)
 
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* Man page <code>mkfs.ext4</code>: https://linux.die.net/man/8/mkfs.ext4
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* Man page <code>[[ext4]]</code>: https://man7.org/linux/man-pages/man5/ext4.5.html
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<pre>
 
<pre>
 
mkfs.ext4 /dev/vg01/lv01
 
mkfs.ext4 /dev/vg01/lv01
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</pre>
 
</pre>
  
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[[mkfs.ext4]] /dev/sda222
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mke2fs 1.44.1 (24-Mar-2018)
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Found a dos partition table in /dev/sda222
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Proceed anyway? (y,N) y
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mkfs.ext4: inode_size (128) * inodes_count (0) too big for a filesystem with 0 blocks, specify higher inode_ratio (-i) or lower inode count (-N).
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 +
Review your partition table (<code>[[fdisk -l]] /dev/sda222</code>), read https://www.beinfog.com/systems/dont-try-to-create-file-system-on-an-extended-partition/
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 +
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mkfs.ext4 -S
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-S  Write [[superblock]] and group descriptors only.
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 +
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Create an ext4 filesystem on a file <ref>https://askubuntu.com/a/841306</ref>:
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[[fallocate]] -l 1G  /path/to/yourfile
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mkfs.ext4 -F /path/to/yourfile
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-F force mke2fs to create a filesystem, even if the specified device is not a partition on a block special device, or if other parameters do not make sense. In order to force mke2fs to create a filesystem even if the filesystem appears to be in use or is mounted (a truly dangerous thing to do), this option must be specified twice. (from man page)
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sudo [[mount]] /path/to/yourfile /mnt/directory_to_mount
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[[df -h]] /mnt/directory_to_mount
  
 
== Activities ==
 
== Activities ==
−
# Create an [[ext4]] filesystem using <code>[[ext4/mkfs.ext4|mkfs.ext4]]</code> command
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# Create an [[ext4]] filesystem using <code>[[mkfs.ext4]]</code> command
 
# Learn about bytes per [[inode]] ratio: https://wiki.archlinux.org/index.php/ext4#Bytes-per-inode_ratio
 
# Learn about bytes per [[inode]] ratio: https://wiki.archlinux.org/index.php/ext4#Bytes-per-inode_ratio
 
# [[resize2fs]] online and ext4 filesystem
 
# [[resize2fs]] online and ext4 filesystem
−
# Learn about Lazy initialization feature of ext4: https://www.thomas-krenn.com/en/wiki/Ext4_Filesystem#Lazy_Initialization
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# Learn about Lazy initialization feature of ext4: https://www.thomas-krenn.com/en/wiki/Ext4_Filesystem#Lazy_Initialization and how to avoid it <code>mkfs.ext4 -E lazy_itable_init=0,lazy_journal_init=0 /dev/mapper/fc-device</code>
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 +
 
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== Related commands ==
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* <code>[[mount]]</code>
  
 
== See also ==
 
== See also ==
−
* [[File Systems|Filesystem]]
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* {{filesystems}}
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* {{ext4}}
 
* [[mount]] (/etc/[[fstab]])
 
* [[mount]] (/etc/[[fstab]])
−
* [[mkfs]]
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* {{mkfs}}
 
* {{lvm commands}}
 
* {{lvm commands}}
 
* [[inode]], [[superblock]] and [[block]] size
 
* [[inode]], [[superblock]] and [[block]] size

Latest revision as of 11:12, 26 November 2020

mkfs.ext4 /dev/vg01/lv01
mke2fs 1.44.1 (24-Mar-2018)
Creating filesystem with 2441850880 4k blocks and 305233920 inodes
Filesystem UUID: e6742357-a181-4b82-837f-9a01f3e52568
Superblock backups stored on blocks:
	32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
	4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
	102400000, 214990848, 512000000, 550731776, 644972544, 1934917632

Allocating group tables: done
Writing inode tables: done
Creating journal (262144 blocks): done
Writing superblocks and filesystem accounting information: done

mkfs.ext4 /dev/sda222
mke2fs 1.44.1 (24-Mar-2018)
Found a dos partition table in /dev/sda222
Proceed anyway? (y,N) y
mkfs.ext4: inode_size (128) * inodes_count (0) too big for a filesystem with 0 blocks, specify higher inode_ratio (-i) or lower inode count (-N).

Review your partition table (fdisk -l /dev/sda222), read https://www.beinfog.com/systems/dont-try-to-create-file-system-on-an-extended-partition/



mkfs.ext4 -S
-S  Write superblock and group descriptors only.


Create an ext4 filesystem on a file [1]: 

fallocate -l 1G  /path/to/yourfile
mkfs.ext4 -F /path/to/yourfile
-F force mke2fs to create a filesystem, even if the specified device is not a partition on a block special device, or if other parameters do not make sense. In order to force mke2fs to create a filesystem even if the filesystem appears to be in use or is mounted (a truly dangerous thing to do), this option must be specified twice. (from man page)
sudo mount /path/to/yourfile /mnt/directory_to_mount
df -h /mnt/directory_to_mount

Activities[edit]

  1. Create an ext4 filesystem using mkfs.ext4 command
  2. Learn about bytes per inode ratio: https://wiki.archlinux.org/index.php/ext4#Bytes-per-inode_ratio
  3. resize2fs online and ext4 filesystem
  4. Learn about Lazy initialization feature of ext4: https://www.thomas-krenn.com/en/wiki/Ext4_Filesystem#Lazy_Initialization and how to avoid it mkfs.ext4 -E lazy_itable_init=0,lazy_journal_init=0 /dev/mapper/fc-device


Related commands[edit]

See also[edit]

scan: pvscan vgscan
LVM: lvs lvmscan lvm fullreport lvmreport lvmconfig lvmdump lvmcheck lvm dumpconfig
Scan: pvs vgs lvs pvscan vgscan
PV: pvcreate pvremove pvscan pvremove pvscan pvs pvchange pvck pvdisplay pvresize
LV: lvdisplay lvcreate lvremove, lvresize, lvextend, lvreduce, lvrename
VG: vgdisplay,vgcreate,vgremove, vgextend, vgreduce, vgscan, vgchange, vgrename, vgcfgbackup, vgcfgrestore, vgimportclone, vgck
Check commands: pvck vgck
  • ↑ https://askubuntu.com/a/841306
    • Retrieved from "https://www.wikieduonline.com/index.php?title=Mkfs.ext4&oldid=43816"

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