[CentOS] compare zfs xfs and jfs o

Joerg Schilling Joerg.Schilling at fokus.fraunhofer.de
Mon Aug 13 19:52:03 UTC 2012


Dennis Clarke <dclarke at blastwave.org> wrote:

>
> > > Comparison numbers are only valid of the tests run are the same. 
> > >
> > > So here is the UFS test once more without the compression and
> > > with -no-fifo : 
> > >
> > > jupiter-sparc-SunOS5.10 # ptime /opt/schily/bin/star -x -xdir -xdot 
> > -no-fifo -U file=../linux-3.5.1.tar
> > > star: 46849 blocks + 0 bytes (total of 479733760 bytes = 468490.00k).
> > >
> > > real    27:44.237
> > > user        2.031
> > > sys        42.419
> > >
> > > Not a good result. 
> > 
> > So try to think about the reasons..... star is definitely not the reason.
> > The fact that you spend 10x the amount of expectes SYS CPU seems to 
> > lead to a 
> > problem on your system.
> > 
> > Also the USER CPU time is 8x the expected amount. Did you run this 
> > test in 
> > _very_ old hardware?
> > 
> > Jörg
>
> It would be reasonable to think of a Sun Fire V480 as old hardware yes, but
> not *very* old. I do have *very* old if you would like me to test there? 

Well, this machine is 11 years old now.

This explains the large amount of CPU time.

> The server runs fine, is patched up to date. The UFS filesystem that was 
> used is actually the root filesystem and it is a metadevice mirror of
> the two internal disks. 

A simple mirror is slow.

However, a 2300 GB FCAL drive should be faster.

But... did you turn on logging?

Jörg

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