On Tue, Jul 03, 2007 at 01:10:25PM -0500, Albert Chin wrote:
> On Tue, Jul 03, 2007 at 11:02:24AM -0700, Bryan Cantrill wrote:
> > On Tue, Jul 03, 2007 at 10:26:20AM -0500, Albert Chin wrote:
> > > PSARC 2007/171 will be available in b68. Any documentation anywhere on
> > > how to take advantage of it?
> > > 
> > > Some of the Sun storage arrays contain NVRAM. It would be really nice
> > > if the array NVRAM would be available for ZIL storage. 
> > 
> > It depends on your array, of course, but in most arrays you can control
> > the amount of write cache (i.e., NVRAM) dedicated to particular LUNs.
> > So to use the new separate logging most effectively, you should take
> > your array, and dedicate all of your NVRAM to a single LUN that you then
> > use as your separate log device.  Your pool should then use a LUN or LUNs
> > that do not have any NVRAM dedicated to it.  
> 
> Hmm, interesting. We'll try to find out if the 6140's can do this.

Yes, they can:  use CAM to set the write cache to be "disabled" on all but
the LUN(s) that you want to use as the separate ZIL.

        - Bryan

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Bryan Cantrill, Solaris Kernel Development.       http://blogs.sun.com/bmc
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