IBM is serious about flash storage and they are enabling just about everything for flash—the DS8000 family, San Volume Controller, EasyTier, Real-time Compression (RtC), and more. Of particular interest to DancingDinosaur readers should be the recently announced DS8870 all flash enclosure.
Storage in general is changing fast. Riding Moore’s Law for the past two decades, storage users could assume annual drops in the cost per gigabyte. It was as predictable as passing go in Monopoly and collecting $200. But with that ride coming to an end companies like IBM are looking elsewhere to engineer the continued improvements everyone assumed and benefited from. For example, IBM is combining SVC, RtC, and flash to get significantly more performance out of less actual storage capacity.
The DS8870 is particularly interesting. In terms of reliability, for instance, it delivers not five-nines (99.999%) availability but six-nines (99.9999%) availability. That works out to be about 30 seconds of downtime each year. It works with all IBM servers, not just the z, and it protects data through full disk encryption and advanced access control. With the new flash enclosure packed with IBM’s enhanced flash the DS8870 delivers 4x faster flash performance in 50% less space. That translates into a 3.2x improvement in database performance.
Flash is not cheap when viewed through the traditional cost/gigabyte metric, but the above performance data suggests a different way to gauge the cost of flash, which continues to steadily fall in price. The 3.2x increase in database performance, for example, means you can handle over 300% more transactions.
Let’s start with the assumption that more transactions ultimately translate into more revenue. The same for that extra 9 in availability. The high-performance all flash DS8870 configuration with the High Performance Flash Enclosure also reduces the footprint by 50% and reduces power consumption by 12%, which means lower space and energy costs. It also enables you to shrink batch times by 10%, according to IBM. DancingDinosaur will be happy to help you pull together a TCO analysis for an all-flash DS8870 investment.
The sheer specs of the new system are impressive. IBM reports the product’s up to 8 PCIe enclosures populated with 400 GB flash cards provides 73.6TB of usable capacity. For I/O capacity the 8 I/O bays installed in the base frame provide up to 128 8Gb FC ports. Depending on the internal server you install in the DS8870 you can also get up to 1TB of cache.
The Flash Enclosure itself is a 1U drawer that can take up to 30 flash cards. By opting for thirty 400GB flash cards you will end up with 9.2TB Usable (12 TB raw). Since the high-performance all flash DS8870 can take up to 8 Flash Enclosures you can get 96TB raw (73.6TB usable) flash capacity per system.
A hybrid DS8870 system, as opposed to the high-performance all flash version, will allow up to 120 Flash cards in 4 Flash Enclosures for 48TB raw (36.8TB usable), along with 1536 2.5” HDDs/SSDs. Then, connect it all to the DS8870 internal PCIe fabric for impressive performance— 200,000 IOPS (100% read) and 130,000 IOPS (100% write). From there, you can connect it to flash-enabled SVC and Easy Tier.
Later this year, reports Clod Barrera, IBM’s storage CTO, you will be able to add 4 more enclosures in hybrid configurations for boosting flash capacity up to 96TB raw. Together you can combine the DS8870, flash, SVC, RtC, and EasyTier for a lightning fast and efficient storage infrastructure.
Even the most traditional System z shop will soon find itself confronting mixed workloads consisting of traditional and non-traditional workload. You probably already are as mobile devices initiate requests for mainframe data. Pretty soon you will be faced with incorporating traditional and new workloads. When that happens you will want a fast, efficient, flexible infrastructure like the DS8870.
DancingDinosaur is Alan Radding. Follow him onTwitter, @mainframeblog