Write Disk Caching

[Guest Eager]

Clean install of Windows Server 2003 (x64 Enterprise Edition), not a DC yet.

Copy from another local disk to the boot disk is fast as expected.

After promoting (by wizard) to DC, the same operation seems to be 5-10 times

slower (depending of many small or fewer large files).

Tried to enable write caching (I beleive the promotion wizard disabled it)

and got back the initial fast speed.

 

This is not a setting I am very happy with because perhaps big loss may be

experienced if power is lost (experience), should of course use another disk

for storing "normal" data.

Anyway, is this large difference what should be expected (5-10 times slower

without caching) or could it be something else ?