> A STEC Zeus IOPS SSD (45K IOPS) will behave quite differently than an Intel 
> X-25E (~3.3K IOPS).
Where can you even get the Zeus drives? I thought they were only in the OEM 
market and last time I checked they were ludicrously expensive. I'm looking for 
between 5k and 10k IOPS using up to 4 drive bays (so a 2 x 2 striped mirror 
would be fine). Right now we peak at about 3k IOPS (though that's not to a ZFS 
system) but I would like to be able to be able to burst to double that. We do 
have a lot of small size burst writes hence our ZIL concerns.

> A SRAM or DRAM-based "drive" (with FLASH backup) will behave
dramatically differently than a typical SSD.
As long as it can speak SAS or SATA and I can put it in a drive shelf I'd 
happily consider using it. All the DRAM devices I know are host based and that 
won't help my cluster.

On that note- what write optimized SSD's do you recommend? I don't actually 
know where to buy the Zeus drives even if they've become more reasonably priced.

Thanks for taking the time to share- it's been very informative.
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