Content-type: text/html Man page of showfile


Section: Maintenance Commands (8)
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showfile - displays the attributes of AdvFS files  


/usr/sbin/showfile [-x] filename...



Displays the full storage allocation map (extent map) for AdvFS files.


One or more file names. If you do not supply a filename argument, use an asterisk (*) to display the entire directory.


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. 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; usf, nfsv3, and so on.
The showfile command cannot display attributes for 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. 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.

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%
 4.8001    1    16      1    simple    **     **  ftx   100%  quota.user 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







This document was created by man2html, using the manual pages.
Time: 02:40:41 GMT, October 02, 2010