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Top Forums UNIX for Dummies Questions & Answers creating jfs Post 30137 by Perderabo on Thursday 17th of October 2002 09:04:08 AM
Old 10-17-2002
There's gotta be some confusion here...

On HP-UX, 4 MB is the default extent size for LVM. LVM takes a collection of physical disks and carves them up into usuable disk sections.

When you're actually using the disk sections, the LVM extent size is invisible to you. You can use these disk sections for swap areas, dump areas, raw database sections and even filesystems.

And if you wanted, you can bypass LVM and use disk directly for any of these things. If you did that, you would not even have an LVM extent size.

The Veritas filesystem also has a notion of extents but 4 MB is impossibly large for that.
 

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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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