showfile(8) System Manager's Manual showfile(8)
showfile - displays the attributes of AdvFS directories and files
/usr/sbin/showfile [-i] [-h | -x] filename...
Displays the raw extent map for an AdvFS file (including any holes). You cannot use both the -h and the -x options in the same command.
When a filename is a directory, displays attributes for the directory's index file. Displays the full storage allocation map (extent map)
for AdvFS files. You cannot use both the -h and the -x options in the same command.
One or more directory or file names. If you do not supply filename arguments, you can use an asterisk (*) to display all the files in the
The showfile command displays the attributes of one or more AdvFS files. The command also displays the extent map of each file. An extent
is a contiguous area of disk space that the file system allocates to a file. Simple files have one extent map; striped files have an
extent map for every stripe segment.
You can list AdvFS attributes for an individual file or the contents of a directory. Although the showfile command lists both AdvFS and
non-AdvFS files, the command displays meaningful information for AdvFS files only.
The showfile command displays the following file attributes: Id
The unique number (in hexadecimal format) that identifies the file. Digits to the left of the dot (.) character are equivalent to a
UFS inode. Vol
The location of primary metadata for the file, expressed as a number. The data extents of the file can reside on another volume.
The page size in 512-byte blocks Pages
The number of pages allocated to the file XtntType
The extent type can be simple, which is a regular AdvFS file without special extents; stripe, which is a striped file; symlink,
which is a symbolic link to a file; ufs, nfsv3, and so on. The showfile command cannot display attributes for either symbolic links
or non-AdvFS files Segs
The number of stripe segments per striped file, which is the number of volumes a striped file crosses. (Applies only to stripe
The number of pages per stripe segment. (Applies only to stripe type.) I/O
The type of write requests to this file. Write requests are buffered (the AdvFS default) Forced synchronous writes as described in
chfile(8) Write requests executed under AdvFS transaction control, which is reserved for metadata files and directories. Perf
The efficiency of file-extent allocation, expressed as a percentage of the optimal extent layout. A high percentage, such as 100%,
indicates that the AdvFS I/O system has achieved optimal efficiency. A low percentage indicates the need for file defragmentation.
The name of the directory or file. If the file is a directory that has an index file associated with it and the -i option has not
been specified, the statistics displayed are for the directory. The term index follows the directory name. If the file is a direc-
tory that has an index file associated with it and the -i option is specified, the statistics displayed are for the index file asso-
ciated with the directory. The name of the directory follows the index.
Whereas a simple file has one extent map, a striped file has more than one extent map. An extent map (numbered extentMap:1, extentMap:2,
and so on) displays the following information: pageOff
The starting page number of the extent pageCnt
The number of pages in the extent vol
The location of the extent, expressed as a number volBlock
The starting block number of the extent blockCnt
The number of blocks in the extent extentCnt
The number of extents
The following example displays the AdvFS-specific attributes for all the files in the current working directory: # showfile *
Id Vol PgSz Pages XtntType Segs SegSz I/O Perf File 6.8001 1 16 427 simple ** ** async 100% datafile1 7.8001 1 16
427 simple ** ** sync 100% datafile2 5.8001 1 16 1 simple ** ** ftx 100% quota.group 4.8001 1 16 1 sim-
ple ** ** ftx 100% quota.user The following example displays the attributes for a directory named dir1 and then displays the
attributes for an index file for the dir1 directory: # showfile dir1
Id Vol PgSz Pages XtntType Segs SegSz I/O Perf File 7b.8001 1 16 48 simple ** ** ftx 13% dir1 (index) # showfile -i
Id Vol PgSz Pages XtntType Segs SegSz I/O Perf File 5511.8001 1 16 43 simple ** ** ftx 15% index (dir1) The following
example shows the attributes and extent information for the mail file, which is a simple file: # showfile -x mail
Id Vol PgSz Pages XtntType Segs SegSz I/O Perf File 4198.800d 2 16 27 simple ** ** async 66% tutor
pageOff pageCnt vol volBlock blockCnt
0 5 2 781552 80
5 12 2 785776 192
17 10 2 786800 160