Comparison of File Systems - Allocation and Layout Policies

Allocation and Layout Policies

File system Block suballocation Variable file block size Extents Allocate-on-flush Sparse files Transparent compression
CBM DOS No Partial No No No No
CP/M filesystem No No Yes No Yes No
Btrfs Yes No Yes Yes Yes Yes
DECtape No No No No No No
Level-D Yes No Yes No No No
DOS (GEC) No Yes Yes No No No
OS4000 No Yes Yes No No No
V6FS No No No No Yes No
V7FS No No No No Yes No
FAT12 No No No No No No
FAT16 No No No No No No
FAT32 No No No No No No
exFAT Unknown No No Unknown No No
GFS Partial No No No Yes No
HPFS No No Yes No No No
NTFS Partial No Yes No Yes Partial
HFS Plus No No Yes Yes No Yes
FFS 8:1 No No No Yes No
UFS1 8:1 No No No Yes No
UFS2 8:1 Yes No No Yes No
LFS 8:1 No No No Yes No
ext2 No No No No Yes No
ext3 No No No No Yes No
ext3cow No No No No Yes No
ext4 No No Yes Yes Yes No
Lustre No No Yes Yes Yes No
NILFS No No No Yes Yes No
ReiserFS Yes No No No Yes No
Reiser4 Yes No Yes Yes Yes Yes
OCFS No No Yes No Unknown No
OCFS2 No No Yes No Yes No
Reliance No No No No No No
Reliance Nitro No No Yes No Yes No
XFS No No Yes Yes Yes No
JFS Yes No Yes No Yes only in JFS1 on AIX
QFS Yes No No No Unknown No
BFS No No Yes No Unknown No
NSS No No Yes No Unknown Yes
NWFS Yes No No No Unknown Yes
ODS-5 No No Yes No Unknown No
VxFS Unknown No Yes No Yes No
UDF No No Yes Depends No No
Fossil No No No No Unknown Yes
VMFS2 Yes No No No Yes No
VMFS3 Yes No Yes No Yes No
ZFS Partial Yes No Yes Yes Yes
PramFS No No No No Yes No
File system Block suballocation Variable file block size Extents Allocate-on-flush Sparse files Transparent compression

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