journal on an ssd

[Eric Sandeen]

Tobias Oetiker wrote:
> Experts,
> 
> What happens if the disk hosting an external journal of a filesytem
> running with data=journal goes bust.
> 
> The Backstory ...
> 
> I have been batteling with filesystem performance for some time
> now. Our setup is a HW Raid(6) with LVM on top and ext3 filesytems.
> 
> Recently we added an SSD to our setup and have moved all the journals
> to this ssd. This has dramatically improved performance and
> especially reduced the interdependence between performance of
> different partitions hosted on the same RAID.
> 
>  http://insights.oetiker.ch/linux/external-journal-on-ssd.html

How does this compare to putting journals on a separate non-ssd device?

-Eric