Extfs serial
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G number-of-groups Specify the number of block groups that will be packed together to create a larger virtual block group (or "flex_bg group") in an ext4 filesystem. Option rather than manipulating the number of blocks per group.) This option is generally used by developers who are developing test cases. (For administrators who are creating filesystems on RAID arrays, it is preferable to use the stride RAID parameter as part of the -E There is generally no reason for the user to ever set this parameter, as the default is optimal for theįilesystem. g blocks-per-group Specify the number of blocks in a block group. 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 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 f fragment-size Specify the size of fragments in bytes. Nodiscard Do not attempt to discard blocks at mkfs time. This significantly speeds up filesystem initialization. When theĭevice advertises that discard also zeroes data (any subsequent read after the discard and before write returns zero), then mark all not-yet-zeroed inode Test_fs Set a flag in the filesystem superblock indicating that it may be mounted using experimental kernel code, such as the ext4dev filesystem.ĭiscard Attempt to discard blocks at mkfs time (discarding blocks initially is useful on solid state devices and sparse / thin-provisioned storage). Omitted, it defaults to 1 to enable lazy inode table initialization. Noticeably, but it requires the kernel to finish initializing the filesystem in the background when the filesystem is first mounted.
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If enabled and the uninit_bg feature is enabled, the inode table will not be fully initialized by mke2fs. Resize= max-online-resize Reserve enough space so that the block group descriptor table can grow to support a filesystem that has max-online-resize blocks. This allows the blockĪllocator to prevent read-modify-write of the parity in a RAID stripe if possible when the data is written. for RAID 5 there is one parity disk, so N will be the number of disks in the array minus 1). This is typically stride-size * N, where N is the number Stripe-width= stripe-width Configure the filesystem for a RAID array with stripe-width filesystem blocks per stripe.
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It may also be used by the block allocator. To avoid placing them on a single disk, which can hurt performance. This mostly affects placement of filesystem metadata like bitmaps at mke2fs time The next disk, which is sometimes referred to as the chunk size. This is the number of blocks read or written to disk before moving to Stride= stride-size Configure the filesystem for a RAID array with stride-size filesystem blocks. The -R option is still accepted for backwards compatibility. Used to be -R in earlier versions of mke2fs. Extended options are comma separated, and may take an argument using the equals ('=') sign. E extended-options Set extended options for the filesystem. If this option is specified twice, then a slower read-write test is used instead of a fast c Check the device for bad blocks before creating the file system. This is useful forĬertain hardware devices which require that the blocksize be a multiple of 2k. Heuristics to determine the appropriate block size, with the constraint that the block size will be at least block-size bytes.
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If block-size is negative, then mke2fs will use The filesystem size and the expected usage of the filesystem (see the -T option). If omitted, block-size is heuristically determined by Valid block-size values are 1024, 20 bytes per block. Options -b block-size Specify the size of blocks in bytes.
#EXTFS SERIAL MANUAL#
See the nf(5) manual page for more details. The defaults of the parameters for the newly created filesystem, if not overridden by the options listed below, are controlled by the If called as mkfs.ext3 a journal is created as if the -j option was specified. Mke2fs automagically figures the file system size. blocks-count is the number of blocks on the device. Mke2fs -O journal_dev ĭescription mke2fs is used to create an ext2, ext3, or ext4 filesystem, usually in a disk partition.ĭevice is the special file corresponding to the device (e.g /dev/hdXX).