Why is newfs and ufsdump so much slower in single user mode than in run level 3?

From: Steven Sim (steven.sim@faplccc.net)
Date: Fri Jun 16 2006 - 14:17:17 EDT

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Hello;

I frequently conduct the following operation;

#ufsdump 0f - <unmounted ufs raw device> | (cd /mnt; ufsrestore xf -)

I have noticed that the above takes place so much slower in single user
mode than in multi user mode.

A newfs operation on a local block device is also much slower in single
user mode than in run level 3.

I'm sure there is a reason for this but it eludes me.....

Also, would the mounting /mnt with the ufs forcedirectio option make the
ufsrestore faster?

e.g.

#mount -F ufs -o forcedirectio /dev/dsk/c1t1d0s5 /mnt

Warmest Regards
Steven Sim

Fujitsu Asia Pte. Ltd.
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