mkfs.ext3 option

mkfs.ext3

OPTIONS

-b block-size

Specify  the  size  of blocks in bytes.  Valid block-size values are 1024, 2048 and 4096 bytes per block.  If omitted, block-size is heuristically determined by the filesystem size and

the expected usage of the filesystem (see the -T option).  If block-size is preceded by a negative sign ('-'), then mke2fs will use heuristics to determine the appropriate block  size,

with the constraint that the block size will be at least block-size bytes.  This is useful for certain hardware devices which require that the blocksize be a multiple of 2k.

-c     Check the device for bad blocks before creating the file system.  If this option is specified twice, then a slower read-write test is used instead of a fast read-only test.

-C  cluster-size

Specify  the size of cluster in bytes for filesystems using the bigalloc feature.  Valid cluster-size values are from 2048 to 256M bytes per cluster.  This can only be specified if the

bigalloc feature is enabled.  (See the ext4 (5) man page for more details about bigalloc.)   The default cluster size if bigalloc is enabled is 16 times the block size.

-D     Use direct I/O when writing to the disk.  This avoids mke2fs dirtying a lot of buffer cache memory, which may impact other applications running on a  busy  server.   This  option  will

cause mke2fs to run much more slowly, however, so there is a tradeoff to using direct I/O.