10-10-2009
in jfs number of inodes are fixed,in jfs2 dynamically inodes are generated
jfs inode size will be max 128 bytes ,in jfs2 max size is 512 bytes
jfs have only one log file but jfs2 every FS can have own log file
log file is observe the process in file system
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LEARN ABOUT REDHAT
mkfs.jfs
mkfs.jfs(8) JFS file system creation mkfs.jfs(8)
NAME
mkfs.jfs - create a JFS formatted partition
SYNOPSIS
mkfs.jfs [options] device
DESCRIPTION
mkfs.jfs is used to create (format) a JFS partition. mkfs.jfs must be run as root.
device is the special file name corresponding to the actual device (e.g. /dev/hdb1) on which a JFS file system will be created.
The default block size is 4096.
WARNING
mkfs.jfs will destroy all data on the specified device!
OPTIONS
-c Check the device for bad blocks before building the file system.
-L volume_label
Set the volume label for the file system.
-O Provide case-insensitive support for compatibility with OS/2.
-q Quiet execution - do not ask for confirmation before creating the file system.
-s log_size
Set the log size (in megabytes). If the -s option is not used, the default log size is 0.4% of the aggregate size.
-V Print version information and exit (regardless of any other chosen options).
EXAMPLES
Format 3rd partition on 2nd hard disk with the volume label "JFS_hdb3":
mkfs.jfs -L JFS_hdb3 /dev/hdb3
Format 5th partition on 1st hard disk, verifying each block created:
mkfs.jfs -c /dev/hda5
REPORTING BUGS
If you find a bug in JFS or mkfs.jfs, please report it via the bug tracking system ("Report Bugs" section) of the JFS project web site:
http://oss.software.ibm.com/jfs
Please send as much pertinent information as possible including any error messages resulting from running mkfs.jfs and the complete output
of running fsck.jfs with the -v option.
SEE ALSO
mkfs(8), fsck.jfs(8), extendfs(8), logdump(8), logredo(8), xchkdmp(8), xpeek(8)
AUTHORS
Barry Arndt (barndt@us.ibm.com)
William Braswell, Jr.
mkfs.jfs is maintained by IBM.
See the JFS project web site for more details:
http://oss.software.ibm.com/jfs/
November 9, 2001 mkfs.jfs(8)