Vincent Fox wrote:
> When Sun starts selling good SAS JBOD boxes equipped with appropriate
> redundancies and a flash-drive or 2 for the ZIL I will definitely go that
> route. For now I have a bunch of existing Sun HW RAID arrays so I make use
> of them mainly to make sure I can package LUNs and that assigned hot-spares
> are used to rebuild the LUNs when needed.
>
Why not a RAID box with enough battery backed RAM, and that supports
enough LUNs that you can make 1 RAID0 LUN for every drive? and gain the
benefits of the battery backed write cache on every write, not just the
ZIL writes?
Is the benefit of a fast ZIL enough? Is it so close that the rest of
what I describe is a waste?
Granted JBOD plus Flash ZIL might be cheaper. Not having been able to do
any testing of my own yet, I'm still struggling to understand the likely
performance differences in the 2 approaches (or the third: the RAID0
idea above plus the Flash ZIL.)
-Kyle
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