This chapter discusses the following:
 | Caution: When you create a filesystem, all files already on the disk partition or logical volume are destroyed. |
Use the following procedure to make an XFS filesystem:
Review Chapter 2, “Planning an XFS Filesystem” to verify that you are ready to begin this procedure.
Identify the device name of the partition or logical volume where you plan to create the filesystem. This is the value of partition in the examples below. For simplicity, the examples in this chapter use an example partition name of /dev/sdc1. (For more information about partitioning, see the parted(8) man page.)
If the disk partition is already mounted, unmount it:
# umount partition
Caution: Any data that is on the disk partition is destroyed. For example:
# umount /dev/sdc1
Use the mkfs.xfs(8) command to make the filesystem. See the following examples:
Make a mount directory:
# mkdir -p mountdir
mountdir is the directory to be mounted. For example:
# mkdir -p /mnt/scratch_space
Mount the filesystem on the mount directory:
# mount partition mountdir
For example:
# mount /dev/sdc1 /mnt/scratch_space
To configure the system so that the new filesystem is automatically mounted when the system is booted, add the following line to the file /etc/fstab:
partition mountdir xfs defaults 0 0
For example:
/dev/sdc1 /mnt/scratch_space xfs defaults 0 0
If you are making a filesystem on a disk partition or on a logical volume that does not have a log subvolume and want to use the default values for block size and log size, use the following command to create the new XFS filesystem:
# mkfs.xfs partition |
The following example shows the command line to create an XFS filesystem using the defaults and system output:
# mkfs.xfs /dev/sdc1
meta-data=/dev/sdc1 isize=256 agcount=18, agsize=1048576 blks
data = bsize=4096 blocks=17921788, imaxpct=25
= sunit=0 swidth=0 blks, unwritten=0
naming =version 2 bsize=4096
log =internal log bsize=4096 blocks=2187, version=1
= sunit=0 blks
realtime =none extsz=65536 blocks=0, rtextents=0 |
If you are making a filesystem on a disk partition or on a logical volume that does not have a log subvolume and want to specify the block size and log size, use the following mkfs.xfs command to create the new XFS filesystem:
# mkfs.xfs -b size=blocksize -l size=logsize partition |
blocksize is the filesystem block size (see “Choosing the Filesystem Block Size” in Chapter 2), logsize is the size of the area dedicated to log records (see “Choosing the Log Type and Size” in Chapter 2), and partition is the device name or logical volume. The default values are 4-KB blocks and a 1000-block log.
The following example shows the command line used to create an XFS filesystem and the system output. The filesystem has a 10-MB internal log and a block size of 1 KB and is on the partition /dev/dsk/dks0d4s7 .
# mkfs.xfs -b size=1k -l size=10m /dev/sdc1
meta-data=/dev/sdc1 isize=256 agcount=18, agsize=4194304 blks
data = bsize=1024 blocks=71687152, imaxpct=25
= sunit=0 swidth=0 blks, unwritten=0
naming =version 2 bsize=4096
log =internal log bsize=1024 blocks=10240, version=1
= sunit=0 blks
realtime =none extsz=65536 blocks=0, rtextents=0 |
If you are making a filesystem on a logical volume that has a log subvolume (for an external log), use the following mkfs.xfs command to make the new XFS filesystem:
# mkfs.xfs -l logdev=device,size=blocksize partition |
For example, to make a filesystem on partition /dev/sdc1 , with an external log on the entire device /dev/sdh , whose size is 65536 filesystem blocks, enter the following:
# mkfs.xfs -l logdev=/dev/sdh,size=65536b /dev/sdc1
meta-data=/dev/sdc1 isize=256 agcount=4, agsize=76433916
blks
= sectsz=512 attr=2
data = bsize=4096 blocks=305735663,
imaxpct=5
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
log =/dev/sdh bsize=4096 blocks=65536, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0 |
If you are making a filesystem with a directory block size that is larger than the filesystem block size, use the following mkfs.xfs command to create the new XFS filesystem:
# mkfs.xfs -b size=blocksize -n size=dirblocksize partition |
dirblocksize is the directory block size (see “Choosing the Filesystem Directory Block Size ” in Chapter 2).
For example:
# mkfs.xfs -b size=2k -n size=4k /dev/sdc1
meta-data=/dev/sdc1 isize=256 agcount=4,
agsize=152867832 blks
= sectsz=512 attr=2
data = bsize=2048 blocks=611471327,
imaxpct=5
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0
log =internal log bsize=2048 blocks=298569, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0 |
To grow an existing XFS filesystem, increase the available disk space and use the xfs_growfs(8) command. The filesystem must be mounted to be grown. The existing contents of the filesystem are undisturbed, and the added space becomes available for additional file storage.
Growing an XFS filesystem is supported on XVM volumes. You must first grow the XVM volume before growing the XFS filesystem. For information on XVM volumes, see the XVM Volume Manager Administrator's Guide.
The following example grows a filesystem mounted at /mnt :
# xfs_growfs /mnt
meta-data=/mnt isize=256 agcount=30, agsize=262144 blks
data = bsize=4096 blocks=7680000, imaxpct=25
= sunit=0 swidth=0 blks, unwritten=0
naming =version 2 bsize=4096
log =internal bsize=4096 blocks=1200 version=1
= sunit=0 blks
realtime =none extsz=65536 blocks=0, rtextents=0
data blocks changed from 7680000 to 17921788 |