While not as commonly used as hypervisors that virtualise servers, there are storage virtualisation products that present multiple arrays from different vendors as one pool. IBM's SAN Volume Controller (SVC) is the most popular product with more than 15,000 units in use, and Hitachi Data Systems' Universal Storage Platform (USP) performs virtualisation in the array. NetApp's V-series gateways also allow users to manage storage from other vendors. EMC's switch-based Invista product has been a flop, but the other three products let you avoid lock-in with individual array suppliers, although they do lock you into the vendor supplying the virtualisation device.
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Solid-state drive vendors are thirsty for volume sales to netbook and storage array users. The key, more than anything else, is cost per GB, as well as a definite performance boost and write-cycle endurance. Intel has made substantial price cuts on its SSD range and Seagate should enter the ranks later this year with its own products. We can expect SanDisk, fortified by financial arrangements with Toshiba and better SSD architectures, to be aggressive in lowering prices. By the end of the year, I expect netbook SSD penetration to have risen markedly and notebook SSD use to have made a perceptible uptick.
Server solid-state disk use should also become more noticeable. Fusion-io's ioDrive technology will be taken up by OEMs such as Dell and IBM, while Sun will deliver servers with write and read flash caches plus server system software specifically coded to use them for working data.
Hitachi Data Systems, NetApp and others will deliver array products with SSD storage tiers, but these will be expensive and positioned as affordable replacements for short-stroked Fibre Channel (FC) drives. Data deduplication technology could change this.
Dedupe has now become a standard feature for storing backup and archive data at the enterprise level and this will spread into the midrange business market – think Acronis and maybe low-end Data Domain products. I expect to see dedupe spread into secondary storage on tier 2 drives in tiered subsystems. There wouldn't be as much benefit as with backed-up data – there's less redundancy – but there would be some and it would decrease the number of drives needed and their power draw.
In-line data deduplication array supplier Data Domain believes dedupe should be a standard technology in drive arrays. The company is slated to release an eight-core Xeon-based controller model later this year. If populated with 2 TB SATA drives, you'll have an amazingly compact array with dedupe storage efficiencies.
Deduped SSDsData Domain is also pushing the idea of deduplication for solid-state drives and that opens the door to a product with SSDs for primary or transaction data, and SATA for secondary data. Deduped SSDs could have their effective storage capacity raised two or three times by deduplication, which would cut the cost per GB. If this comes to fruition, it could open the door to a whole new way of building arrays.
The modular array market is the heart of the storage business. It's where the most money is made and it's where multigenerational products last for decades. We've recently seen EMC update its Clariion CX line, Hitachi Data Systems update its Adaptable Modular Storage (AMS) line and Sun do the same with its 6000 line. We should expect a refreshed HP Enterprise Virtual Array (EVA) line with new midrange and top-end models.
There will be tinkering at the edges. SAS will enter the modular storage world in a bigger way, small form factor (SFF) 2.5-inch drives will start being used to boost I/O rates and SSDs have already started appearing. Thin provisioning is becoming a standard feature, too. It's been a surprise that technologies from 3PAR, Compellent, Pillar Data Systems and Xiotech, which are proving to be profitable and popular in the recession, haven't prompted a bigger "me too" reaction from mainstream vendors or a round of acquisitions. Dell bought iSCSI-based EqualLogic and HP purchased LeftHand Networks, but that was it. How big do the newcomers have to get before they start impinging on the revenues of established vendors?
A big event for NetApp customers will be the delivery of Ontap 8.0, the unification of ordinary and mainstream 7G and clusterable GX. NetApp said the delivery of a global namespace across clusters of NetApp arrays will be a godsend to its customers.
At the high end, we expect a new Symmetrix generation, a DMX-5, to appear, but we have no details to date of what's involved.
What about cloud storage? My feeling is that 2009 will be a year of stepping away from cloud intoxication and taking a more sober look.
Chris Mellor is the storage editor at The Register