UFS Logging (journaling) on Solaris

[Jim Long]

Jerry Feldman wrote:
> Nearly every commercial Unix vendor has abandoned 
> UFS as the default file system of choice. 
> ...I don't know what Sun is using as the default 
> for their servers.

Sun still calls their file system UFS, but it does 
journaling, which they call "UFS Logging". 

This is a quote from the Sun site: 

UFS logging was introduced in the Solaris 7 OE as 
the process of storing transactions in a log before 
the transactions are applied to the UFS file system. 
Once a transaction is stored, the transaction can be 
applied to the file system later. 

Prevents file systems from becoming inconsistent, 
therefore eliminating the need to run fsck(1M). 
Since fsck can be bypassed, UFS logging reduces 
the time required to reboot a system if it crashes 
or after an unclean halt."

Data management enhancements in the Solaris 9 OE 
include a strengthened UFS, improved journaling/
UFS logging and UFS snapshots (with the fssnap 
command).

Since I'm talking about Solaris features, this 
would probably be a good time to announce that
I recently passed the Sun Certified System 
Administrator for Solaris 8 certification.

I prepared for the exams by self-study and 
hands-on experience with Solaris on my home
network. Actually, this was my twenty-first
IT certification exam since 1998. In this 
competitive job market I am trying to show
employers not only that I have the skills they
need, but also that I am highly motivated,
disciplined, self-directed, and goal-oriented.

Jim Long, MCSE SCSA

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