15 managing disk - creating filesystem mkfs
[root@svn ~]# cat /proc/partitions
major minor #blocks name
8 0 31457280 sda
8 1 1048576 sda1
8 2 19921920 sda2
8 16 5242880 sdb
8 17 102400 sdb1
11 0 8086528 sr0
253 0 17821696 dm-0
253 1 2097152 dm-1
major minor #blocks name
8 0 31457280 sda
8 1 1048576 sda1
8 2 19921920 sda2
8 16 5242880 sdb
8 17 102400 sdb1
11 0 8086528 sr0
253 0 17821696 dm-0
253 1 2097152 dm-1
at this point partition created sdb1 is empty, meaning we cannot do anything with it.
to do something with it, we need to create FS on it.
[root@svn ~]# mkfs
mkfs mkfs.cramfs mkfs.ext3 mkfs.fat mkfs.msdos mkfs.xfs
mkfs.btrfs mkfs.ext2 mkfs.ext4 mkfs.minix mkfs.vfat
for working with large file size it makes sense to use large block size (default is 512 byte)
[root@svn ~]# mkfs.xfs --help
mkfs.xfs: invalid option -- '-'
unknown option --
Usage: mkfs.xfs
/* blocksize */ [-b log=n|size=num]
/* inode size */ [-i log=n|perblock=n|size=num,maxpct=n,attr=0|1|2,
projid32bit=0|1]
/* label */ [-L label (maximum 12 characters)]
[root@svn ~]#
[root@svn ~]# mkfs.xfs -L myfs /dev/sdb1
meta-data=/dev/sdb1 isize=512 agcount=4, agsize=6400 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=25600, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=855, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[root@svn ~]#
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