DCOPY(8,C) AIX Commands Reference DCOPY(8,C)
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dcopy
PURPOSE
Copies file systems for the best access time.
SYNTAX
+----------------+ +-- -a7 --+ +-------------------+
dcopy -| +------------+ |--| |--+- -ffsize 1-+- oldfs - newfs -|
+-| -d |-+ +- -anum -+ +- -ffsize : isize -+
^| -v ||
|| -sCyl:skip ||
|+------------+|
+--------------+
-----------------
1 If not specified, the values from oldfs are used.
DESCRIPTION
Warning: oldfs and newfs must not refer to the same minidisk. Doing so will
destroy the old file system.
The dcopy command copies an existing file system oldfs to a new file system
newfs, appropriately sized to hold the reorganized results. For best results,
oldfs should be the raw device, and newfs should be the block device. If oldfs
or newfs is a file system name, dcopy uses the corresponding block device given
in /etc/filesystems. You should run dcopy on unmounted file systems (in the
case of the root file system, copy to a new minidisk).
If you do not specify any flags, dcopy copies files from oldfs, compressing
directories by removing vacant entries and spacing consecutive blocks in a file
by the optimal rotational gap.
The dcopy command makes newfs identical to oldfs and preserves the pack and
volume labels. Thus, to compress a file system without moving it, use the
dcopy command to copy the file to another file system and the dd command to
copy the file back.
The dcopy command catches INTERRUPT and QUIT signals and reports on its
progress. To end dcopy, send a QUIT signal (Ctrl-\) and dcopy no longer
catches INTERRUPT or QUIT. dcopy also attempts to modify its command line
arguments so that its progress can be monitored with the ps command.
Processed November 8, 1990 DCOPY(8,C) 1
DCOPY(8,C) AIX Commands Reference DCOPY(8,C)
Note: If the Transparent Computing Facility is installed and dcopy is run on a
non-primary copy of a replicated file system, dcopy will not perform directory
compression. Directory compression on replicated file systems is accomplished
by running dcopy on the primary copy of the file system and allowing the
modified directories to propagate to the other copies of the file system in the
normal manner. Also, when dcopy is performed on a replicated file system the
original inode numbers are preserved to avoid unnecessary propagation. On a
non-replicated file system inode numbers are changed to use the lowest set of
inodes.
Warning: When run on a mounted primary copy of a replicated file system, it is
important to guarantee that no updates to the file system are made while the
dcopy operation is in progress or until the copied file system replaces the
original. Failure to insure that updates do not occur can result in
inconsistencies between the new primary copy of the file system and its other
non-primary copies. For this reason, it is highly advised that a dcopy on a
primary copy of a file system that cannot be unmounted be done while the system
is in single-user state with cluster communications disabled (see the
clusterstop command) and absence of updates can be reasonably guaranteed.
FLAGS
-anum Places files not accessed in the specified number of days after the
free blocks of the destination file system. The default value of
num is 7. If you do not specify num, no files are moved.
-d Leaves the order of directory entries as is. If you do not specify
this flag, dcopy moves subdirectories to the beginning of
directories.
-ffsize[:isize]
Specifies the file system and inode list sizes (in blocks). If not
specified, the value from oldfs is used.
-scyl:skip Supplies device information for creating the best organization of
blocks in a file, where cyl is the number of block per cylinder and
skip is the number of blocks to skip.
-v Reports how many files were processed and how big the source and
destination free lists are.
RELATED INFORMATION
See the following commands: "fsck, dfsck" and "mkfs."
Processed November 8, 1990 DCOPY(8,C) 2