All-flash arrays: Will time run out for mainstream acceptance?

The all-flash array has been the flavour of recent times in storageland. But, has the hype exceeded the reality?

It may well have done. Or maybe it’s just its timing is off.

If we look at our recent Purchasing Intentions survey there’s no doubt that flash storage is popular. More than half of respondents indicated they had flash in use (36%) or planned to implement (7%) or evaluate it (25%) this year.

That’s a fair amount of traction for flash, but not so much of that kudos can stick to all-flash arrays, according to another survey we ran this summer on, this time from 451 Research.

Its survey gained more granularity on the flash question and found for most respondents (67%) flash in use now is installed in existing SAN/NAS storage arrays while 25% have put it in servers. A mere 8% reported having deployed an all-flash array.

What that shows is that for the most part IT departments see the addition of flash to existing storage or to servers as the best way to accelerate I/O performance for key applications. That should be no surprise – all-flash arrays don’t come cheap and with constrained budgets it’s clearly best to target fast access media where you need it.

But it is in contrast to storage industry hype, and perhaps more importantly, the billions spent to develop or buy all-flash arrays, such as EMC’s purchase of XtremIO, IBM’s Texas Memory Systems acquisition and its pledge to invest $1 billion in flash.

The survey results also show that for many applications right now, disk is quite adequate. Compare the percentage of those in the survey that have virtualised servers (87%) with the numbers that have flash in place (36%) and it looks like there isn’t a rigid driving shaft between the deployment of virtualisation and the need for flash.  

And so, the all-flash array could turn out to be something that takes its time to become a must-have. There’s little doubt that disk will one day be superceded by solid state media, but in the meantime alternatives to flash are being developed. The hope must be in Big Storage Towers that flash is still the solid state media of choice when disk has finally had its day.