Todd E. Moore wrote:
>
> I want to disable write cache on the disk drives in our J4200 JBODs so 
> that fsync() actually writes to disk, not just to the cache on the drive.
>

ZFS will do this for you, via the way the ZIL works.
Neil explains it pretty well at
http://blogs.sun.com/perrin/entry/the_lumberjack

> I did this using 'format -e', but it displays a warning about the 
> drive being part of a zpool and also it says that the change is not 
> permanent.
>  
> Is 'format -e' the right way to do this with ZFS?  Is there no way to 
> make it permanent?

In general, you don't need to do this.  ZFS will send the cache
flush command to the disks as needed.
 -- richard

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