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showfile(8)
NAME
showfile - displays the attributes of AdvFS directories and files
SYNOPSIS
/usr/sbin/showfile [-i] [-h | -x] filename...
OPTIONS
-h 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.
-i When a filename is a directory, displays attributes for the directory's
index file.
-x 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.
OPERAND
filename...
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 current directory.
DESCRIPTION
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 will also display an informational message if a file
has DMAPI-enabled regions, which indicate the possiblility of migrated-out
data. See AdvFS Administration for more information about DMAPI.
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.
· PgSz
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 type.)
· SegSz
The number of pages per stripe segment. (Applies only to stripe type.)
· I/O
The type of write requests to this file.
async Write requests are buffered (the AdvFS default)
sync Forced synchronous writes as described in chfile(8)
ftx 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.
· File
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 directory that has
an index file associated with it and the -i option is specified, the
statistics displayed are for the index file associated 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
EXAMPLES
1. 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 simple ** ** ftx 100% quota.user
2. 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 dir1
Id Vol PgSz Pages XtntType Segs SegSz I/O Perf File
5511.8001 1 16 43 simple ** ** ftx 15% index (dir1)
3. 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
extentMap: 1
pageOff pageCnt vol volBlock blockCnt
0 5 2 781552 80
5 12 2 785776 192
17 10 2 786800 160
extentCnt: 3
4. The following example shows an informational message for a file that
has DMAPI-enabled regions:
# showfile /mnt/file1
Id Vol PgSz Pages XtntType Segs SegSz I/O Perf File
6.8006 1 16 4 simple ** ** async 100% file1
DMAPI regions present on this file.
SEE ALSO
Files: advfs(4)
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Index for
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