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UNIX for Dummies Questions & Answers
creating jfs
Post 30079 by Kelam_Magnus on Wednesday 16th of October 2002 12:20:32 PM
10-16-2002
First, let me say that my reference for this is with HPUX systems.
I am guessing that by fragment you are asking about the byte size for the segments or extents. That depends on the size of your data the default size for most systems is around 4MB. If you have very large datafiles you can set this number higher, upto 256MB or more, but for normal data you should be okay to leave it at 4MB.
Inodes represent the number of files you can create. On some systems, this number is a fixed number that is set when you create a filesystem. IF you set this number too low, you will not be able to create a file even if you have space left on the filesystem.
On systems with JFS Online, I believe that it is a variable amount that you don't have to worry about running out of inodes. You should never have to worry about it with the more advanced vxvm filesystems.
I am not sure what you mean by allocation group size. Maybe you can explain that a little more.
Hope this helps.
I am guessing that by fragment you are asking about the byte size for the segments or extents. That depends on the size of your data the default size for most systems is around 4MB. If you have very large datafiles you can set this number higher, upto 256MB or more, but for normal data you should be okay to leave it at 4MB.
Inodes represent the number of files you can create. On some systems, this number is a fixed number that is set when you create a filesystem. IF you set this number too low, you will not be able to create a file even if you have space left on the filesystem.
On systems with JFS Online, I believe that it is a variable amount that you don't have to worry about running out of inodes. You should never have to worry about it with the more advanced vxvm filesystems.
I am not sure what you mean by allocation group size. Maybe you can explain that a little more.
Hope this helps.
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LEARN ABOUT SUSE
jfs_logdump
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)