xfs(5) File Formats Manual xfs(5) xfs - XFS XFS . XFS : . mkfs.xfs(8) . . mkfs.xfs(8) -b. ( ) ( ) . . mkfs.xfs(8) . . . . ( ) xfs_growfs(8). ( ) . . . . xfsctl(3) . ( mkfs.xfs(8)). . . . mkfs.xfs(8). . . XFS (UUID). UUID XFS dd(1) XFS. XFS UUID xfsdump(8) . xfsdump(8) xfsrestore(8) XFS. nouuid mount(8). XFS xfsctl(3) ( open_by_handle(3)). XFS XFS. mount(8) . allocsize=size / . ( 4KiB) 1GiB 2. . allocsize . attr2|noattr2 : v5.10 noattr2 2025 attr2 . / "" . attr2 ( ) . attr2 . . CRC attr2 noattr2 . dax=value (DAX) . : "dax=inode" DAX FS_XFLAG_DAX. "dax=never" DAX . FS_XFLAG_DAX. "dax=always" DAX FS_XFLAG_DAX. DAX dax=inode . DAX filesystems/dax.txt discard|nodiscard / . SSD LUNs . : fstrim discard . nodiscard . grpid|bsdgroups|nogrpid|sysvgroups . grpid fsgid setgid gid setgid . filestreams filestreams . ikeep|noikeep : v5.10 noikeep 2025 ikeep . ikeep XFS inode . noikeep inode . noikeep . inode32|inode64 inode32 XFS inode inode 32 . inode64 XFS inodes inode 32 . inode32 inode 64 inode . inode 32 inode32. v3.7 inode64 . largeio|nolargeio "nolargeio" / st_blksize stat(2) / //. . "largeio" "swidth" "swidth" () st_blksize. "swidth" "allocsize" "allocsize" () . "nolargeio". nolargeio . logbufs=value . 2 8 . 8 . 8 . logbsize . logbsize=value . (KiB) "k". logbsize - mkfs. 1 2 16384 (=16k) 32768 (=32k). 2 65536 (=64k) 131072 (=128k) 262144 (=256k). 1 32768 2 max(32768, log_sunit) log_sunit . logdev=device rtdev=device ( ) / . XFS : . . noalign . (sunit, swidth) mkfs. norecovery . "norecovery". . "norecovery" . nouuid uuid . LVM "norecovery" . noquota . uquota/usrquota/quota/uqnoenforce/qnoenforce (). xfs_quota(8) . gquota/grpquota/gqnoenforce (). xfs_quota(8) . pquota/prjquota/pqnoenforce (). xfs_quota(8) . sunit=value and swidth=value RAID . "" 512 . . sunit swidth . sunit 2. swidth sunit . RAID lun RAID5 . swalloc . wsync . ( ) . . . . ---- ------- delaylog/nodelaylog v4.0 ihashsize v4.0 irixsgid v4.0 osyncisdsync/osyncisosync v4.0 barrier/nobarrier v4.19 XFS Linux chattr(1): a - A - atime d - i - S - chattr(1). chattr(1), xfsctl(3), mount(8), mkfs.xfs(8), xfs_info(8), xfs_admin(8), xfsdump(8), xfsrestore(8). 3 . . : . xfs(5)