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MKFS_EXAMPLE.md

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Examples of how to create different filesystems

BTRFS

Create a btrfs filesystem on partition ${PART} with label ${LABEL}

mkfs.btrfs -L ${LABEL} ${PART}

The btrfs default blocksize is 16KB. To use a larger blocksize for data/metadata specify a value for the nodesize via the -n switch as shown in this example using 16KB blocks:

mkfs.btrfs -L ${LABEL} -n 16k ${PART}

EXT4

Create an ext4 filesystem on new raid ${RAIDDEV} with label ${LABEL} while doing a read-write bad blocks check

mkfs.ext4 -vv -b4096 -cc -m0 -O metadata_csum,64bit -L ${LABEL} ${RAIDDEV}

Create an ext4 filesystem on new raid ${RAIDDEV} with label ${LABEL} while doing a read-only bad blocks check

mkfs.ext4 -vv -b4096 -c -m0 -O metadata_csum,64bit -L ${LABEL} ${RAIDDEV}

If you need to adjust your bytes-per-inode ratio, use -T to specify a usage-type

mkfs.ext4 -vv -b4096 -m0 -O metadata_csum,64bit -T largefile  -L ${LABEL} ${RAIDDEV}
mkfs.ext4 -vv -b4096 -m0 -O metadata_csum,64bit -T largefile4 -L ${LABEL} ${RAIDDEV}

Ext4 has 3 types of journal opting: Journal, Ordered, and Writeback.
Adjust your ext4 filesystem using one of the following commands.
Only run tune2fs while the filesystem is unmounted.

tune2fs -O has_journal -o journal_data ${RAIDDEV}
tune2fs -O has_journal -o journal_data_ordered ${RAIDDEV}
tune2fs -O has_journal -o journal_data_writeback ${RAIDDEV}

Enable directory indexing with the following command.
Only run tune2fs/e2fsck while the filesystem is unmounted.

tune2fs -O dir_index ${RAIDDEV}
e2fsck -D ${RAIDDEV}

XFS

Create an xfs filesystem on new raid ${RAIDDEV} with label ${LABEL}

mkfs.xfs -L ${LABEL} ${RAIDDEV}