SEO

#1 (**permalink**) 01-12-2008, 06:15 AM

Hi,
I have performed some file-system performance test (Bonnie) on a SunOS
5.6 machine with UFS (default options). I noticed that this test pass most
of the time in a WAIT state and the final result is that it use just a
40-60% of CPU. The same test on a Linux machine with ext2 uses all the CPU
available.

So I think that UFS (my configuration) performs all the file operation in a
sync mode. Am I correct? There is a setting to force an async mode (I didn't
found anything about async in sun docs) in order to have results comparable
to ext2 fs?

Thanks in advance,
Giambattista Bloisi

#2 (**permalink**) 01-12-2008, 06:15 AM

Giambattista Bloisi <DONT@spam.me> wrote:
> So I think that UFS (my configuration) performs all the file operation in a
> sync mode. Am I correct? There is a setting to force an async mode (I didn't
> found anything about async in sun docs) in order to have results comparable
> to ext2 fs?

Firstly you'd be wanting to upgrade to an OS which isn't 6-7 years old (ie,
Solaris 9, or at least 8).

Once you've done that you'll be able to enable UFS logging, which will make
a massive different to the performance you've been seeing.

Search groups.google.com for "ufs logging" and you'll find one of the few
thousand other times this question has been asked before...

If you really want to disable async inode operations on Solaris then you
can do it, but if your machine goes down hard (such as a power failure)
then odds are you'll lose the entire filesystem - much the same as under
Linux in it's default config!

Scott.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

SEO

UFS asynchronous