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Operating Systems Linux Red Hat Unable to copy files due to many files in directory Post 302696405 by Don Cragun on Wednesday 5th of September 2012 02:36:17 AM
Old 09-05-2012
If you have a billion files in a directory, anything you try to do accessing a file in that directory is going to take a LONG time. In this case you have to read the directory twice for each file found that is less than 48 hours old. You said you're copying files, but there is nothing in the command line you listed that will copy anything. The command line you gave will search for groups of names of files that have been modified within the last 48 hours and then read the directory again for each group to print the names of those files.

The time needed to run this pipeline would probably be cut in half (while producing the same results except that the order in which the files are printed may be different) if you used the command:
Code:
find . -mtime -2

instead of the command:
Code:
find . -mtime -2 -print | xargs ls -d

Note that if a lot of files have been changed in the last two days, neither of these will give you a sorted list of the files that have changed.

Note also that if any filenames in the file hierarchy rooted in the current directory contain a space, tab, or newline character, the command you have using xargs will fail, and the output from the replacement command I suggested may be ambiguous.
 

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NCOPY(1)							       ncopy								  NCOPY(1)

NAME
ncopy - NetWare file copy SYNOPSIS
ncopy -V ncopy [ -vmMnpptu ] [ -s amount ] file destinationfile|directory ncopy [ -vmMnpptu ] [ -s amount ] file1 [ file2 ... ] directory ncopy -r [ -vmMnpptu ] [ -s amount ] srcdir dstdir DESCRIPTION
With ncopy you can copy files to different locations on a single NetWare file server without generating excess network traffic. The pro- gram uses a NetWare function to do the copy rather than transferring the file across the network for both the read and write. If the last argument is a directory, ncopy will copy the source file(s) into the directory. If only two files are given and the last argu- ment is not a directory, it will copy the source file to the destination file. If the source and destination files are not on the same NetWare server (or are not on NetWare servers at all), ncopy will do a normal file copy. OPTIONS
-V Show version number and exit -v Verbose copy. Will show current file and percentage completion. -m Copy MAC resource fork. Copies MAC resource fork together with data fork. -M Copy MAC resource fork to/from non-MAC filesystem. It expects/creates resource forks in subdirectory .rsrc of each directory copied. If you want to copy files from MAC volume to .rsrc scheme, you must specify both options, -mM. It is not possible to create .rsrc direc- tory on MAC-aware volume in one step, you must first copy data to non-MAC media using ncopy -mM and then copy them back using ncopy -M. If you want to copy files from .rsrc scheme on MAC volume to real MAC multiple-forks file, you must first copy data to non-MAC filesys- tem using ncopy -M and then copy them back using ncopy -mM. -n Nice NetWare copy. Will sleep for a second between copying blocks on the NetWare server. Gives other people a chance to do some work on the NetWare server when you are copying large files. This has no effect if you are not copying on a NetWare server. -s amount Nice time slice factor. Used in conjunction with the -n option, this specifies the number of 100K blocks to copy before sleeping. Default is 10. (1 Megabyte) -p Preserve file attributes and date/time during copy. -pp Preserve file attributes, date/time and owner during copy. Name of owner is preserved, not owner ID. -t Preserve trustees during copy. Trustee name is preserved, not ID. -r Perform recursive copy. -u Perform copy only if mtime or size differs. BUGS
ncopy does not preserve long (MAC, NFS, FTAM, OS2) names during copy. SEE ALSO
ncpmount(8), ncpumount(8) CREDITS
ncopy was written by Brian G. Reid (breid@tim.com) and Tom C. Henderson (thenderson@tim.com). Many thanks to Volker Lendecke (lendecke@math.uni-goettingen.de) for the ncpfs and ncplib which made ncopy possible. Some further work was done by Petr Vandrovec (van- drove@vc.cvut.cz). ncopy 17/03/1996 NCOPY(1)
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