<SYNOPSIS>
/etc/opt/FJSVgfs/bin/sfcextcount { -f filename | -i inodeno } special
/etc/opt/FJSVgfs/bin/sfcextcount -d { -f filename | -i inodeno } special
<DESCRIPTION>
The sfcextcount outputs the extent information of the file in the GFS Shared File System to the standard output.
special is specified for the representative partition of the GFS Shared File System, where the file specified by filename or inodeno exists.
For the first synopsis, the i-node number of the file, the amount of extent and the amount of indirect extent management information of the file will be output in the format below.
<i-node number>: <amount of extent> <amount of indirect extent management information>
For the second synopsis, the items below will be output for each extent.
offset
File offset (block unit)
partition ID
Internal control number used to show which partition the extent of the file is assigned to.
start block ID
Offset in the partition used to show the starting point of the extent of the file. (block unit)
blocks
Blocks of the extent of the file.
IEX ID
Internal control number for the indirect extent management information of the file. (block unit)
If it is not an indirect extent, "-" will be output.
The block size of offset, start block ID and blocks is 8 kilobytes for regular files, and 1 kilobyte for the directory. The block size of the IEX ID is 1 kilobyte.
Only a super user can execute sfcextcount.
<OPTIONS>
The following options can be specified:
Outputs the extent list for the specified file.
Outputs the extent information of the file filename.
The filename should be specified as the absolute path name.
The -f option can only be used when the GFS Shared File System is mounted.
Outputs the extent information of the file whose i-node number is inodeno.
<OPERANDS>
The following operand can be specified.
Specifies the block or character special file path on a representative partition of the GFS Shared File System.
<EXAMPLES>
Outputs the extent information of a file which i-node number is 4.
(Since the amount of extent is 1, this file is not fragmented.)
# /etc/opt/FJSVgfs/bin/sfcextcount -i 4 /dev/sfdsk/class0001/dsk/volume0001
4: 1 0
# /etc/opt/FJSVgfs/bin/sfcextcount -d -i 4 /dev/sfdsk/class0001/dsk/volume0001
offset partition ID start block ID blocks IEX ID
--------------- --------------- --------------- --------------- ---------------
0 0 1068941 128 - |
Output the extent information of the file which path name is /mnt/gfs/file2.
(Since the amount of extent is 52, this file is fragmented.)
# /etc/opt/FJSVgfs/bin/sfcextcount -f /mnt/gfs/file2 /dev/sfdsk/class0001/dsk/volume0001
6: 52 3
# /etc/opt/FJSVgfs/bin/sfcextcount -d -f /mnt/gfs/file2 /dev/sfdsk/class0001/dsk/volume0001
offset partition ID start block ID blocks IEX ID
--------------- --------------- --------------- --------------- ---------------
0 0 1033117 1 -
1 0 973861 1 -
2 0 1034655 1 -
3 0 968868 1 -
4 0 970278 1 -
5 0 974118 1 -
6 0 969637 1 -
7 0 1035677 1 -
8 0 1034397 1 -
9 0 968356 1 -
10 0 968355 1 -
11 0 1036188 1 -
12 0 971043 1 -
13 0 967330 1 -
14 0 969892 1 -
15 0 1035166 1 -
34 0 974117 1 19
16 0 998369 1 1
17 0 975931 1 1
18 0 975161 1 1
19 0 976955 1 1
20 0 973604 1 1
21 0 1034909 1 1
22 0 977468 1 1
23 0 977213 1 1
24 0 976189 1 1
25 0 972324 1 1
26 0 967587 1 1
27 0 967842 1 1
28 0 971556 1 1
29 0 973094 1 1
30 0 975673 1 1
31 0 976445 1 1
32 0 976444 1 1
33 0 969636 1 1
35 0 970277 1 18
36 0 968867 1 18
37 0 1034654 1 18
38 0 973860 1 18
39 0 1033116 1 18
40 0 971299 1 18
41 0 1033884 1 18
42 0 968612 1 18
43 0 968099 1 18
44 0 970788 1 18
45 0 969124 1 18
46 0 1035420 1 18
47 0 969380 1 18
48 0 1035933 1 18
49 0 998119 1 18
50 0 977722 1 18
51 0 1033627 1 18 |
<NOTES>
The order of the extent information output is not in the ascending order of the offset.
If specifying a file during or directly after updating, the information output will not be correct. It is necessary to wait a few seconds after updating a file before executing this command.
When special is not a representative partition of file system where filename specified by -f option exists, the message "sfcextcount: ERROR: 0003: inodeno is not an i-node number of the existing file" will be output and the sfcextcount will terminate abnormally. Otherwise, the information of a different file will be output.
Since there is a possibility that I/O of the meta-data server sent to special will be slow down, execute this command only when the system load is low.
