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Special Forums Hardware Filesystems, Disks and Memory Performance Hit With Many Files Post 302293371 by cyner on Tuesday 3rd of March 2009 03:28:57 AM
Old 03-03-2009
Question Performance Hit With Many Files

Is it slower to open or create a file in a directory with 1 million files than a directory with 1000 files? How much slower? Where can I find information about this?

I'm mainly concerned about JFS on AIX, but also NTFS on Windows Server. Is there a difference?

I'm trying to determine a good way to store a large number of files (2 million and growing about 200 K per year). Currently, I have them in six different directories, so it's about 300 K files per directory.

Thanks!
 

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jfs_logdump(8)						  JFS utility - journal log dump					    jfs_logdump(8)

NAME
jfs_logdump - dump a JFS formatted device's journal log SYNOPSIS
jfs_logdump [ -a ] device DESCRIPTION
jfs_logdump dumps the contents of the journal log from the specified JFS formatted device into output file ./jfslog.dmp. device is the special file name corresponding to the actual device from which the journal log will be dumped (e.g. /dev/hdb1 ). jfs_logdump must be run as root. OPTIONS
-a Dump the entire contents of the journal log instead of just the committed transactions since the last synch point. EXAMPLE
Dump the entire JFS journal log from the 3rd partition of the 2nd hard disk into ./jfslog.dmp: jfs_logdump -a /dev/hdb3 REPORTING BUGS
If you find a bug in JFS or jfs_logdump, please report it via the bug tracking system ("Report Bugs" section) of the JFS project web site: http://jfs.sourceforge.net/ Please send as much pertinent information as possible, including any jfs_logdump error messages and the complete output of running jfs_fsck with the -v option on the JFS device. SEE ALSO
jfs_fsck(8), jfs_mkfs(8), jfs_fscklog(8), jfs_tune(8), jfs_debugfs(8) AUTHORS
Barry Arndt (barndt@us.ibm.com) William Braswell, Jr. jfs_logdump is maintained by IBM. See the JFS project web site for more details: http://jfs.sourceforge.net/ October 29, 2002 jfs_logdump(8)
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