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Re: journal on an ssd



Hi Eric,

I have not tested this, but since we are putting about 16 different
journals on this one ssd, I would assume that the loss through
seeking between the journals would be pretty bad, and again bring
back that inter-filesystem-dependency we were trying to loose with
this measure.

cheers
tobi

Today Eric Sandeen wrote:

> 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
>
>

-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi oetiker ch ++41 62 775 9902 / sb: -9900


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