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Operating Systems AIX AIX networking performance, during copying files Post 303029674 by supacat on Wednesday 30th of January 2019 12:02:23 PM
Old 01-30-2019
Quote:
Originally Posted by Corona688
You also have your disks to consider. How fast would that happen if you wrote to /dev/null instead of ssh?


Code:

du -sg 3.dmp 
1.00    3.dmp
bash-4.4# time ls ./3.dmp | cpio -ovB | cpio -imvdB /dev/null
3.dmp
20971602097160 blocks 
 blocks 

real    0m3.405s
user    0m2.064s
sys     0m0.934s

1 Gb for 3,4s, or ~300 MB/s (~30MB/s with ssh in comparsion).


Quote:
Does it speed up when you run it twice?
No, I don't observe such bechavior.
 

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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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