[Gluster-users] If using ZFS with GlusterFS, why disable the ZIL?

[Joe Julian]

On 10/9/2014 6:23 AM, Nathan Fiedler wrote:
> In the Gluster community documentation, the ZFS Use Case [1] 
> recommends disabling the ZIL (intent log). Any thoughts on why that 
> would be the case? Much of the advice on tuning ZFS recommends against 
> disabling the ZIL, so I'm curious if there is a good reason why it 
> should be done with Gluster. The use case document certainly does not 
> provide one.
>
> [1] http://gluster.org/documentation/use_cases/GlusterOnZFS/

I've not done that myself but from how I read that document, the user 
did that because he instead configured an ARC cache to use up to 75% of 
the machine's 24Gb of RAM. This prevents the double-write of using an on 
disk journal at the cost of losing data in the event of power loss.