Flash solutions for cache can be installed in 1 of 3 places in a SAN: at the application host, at the storage controller, or somewhere in between. Installation at the application host has the advantage of being the lowest in latency and therefore potentially yields the highest possible I/O rate. Cost, cluster support and downtime are traditional cache implementation issues. Some higher end storage frames have intelligent controllers that can make use of SSD disks within the storage frame, but each frame will need its own SSD, and those SSD’s cannot be shared.
DCS can be inserted into a live production environment without updating drivers and/or rebooting hosts. Cache policies can be set after an I/O analysis is performed by the admin. Alternately, all available SSD capacity can be assigned to all LUNs, and the DCS will determine how best to cache the LUNs based on actual I/O activities.
A typical deployment is comprised of these simple steps:
- Power up the DCS HA pair near the FC switch
- Insert FC datapaths through DCS ports (about 5 seconds per path)
- Review auto-discovered hosts, LUNs and I/O statistics
- Create cache policy with a few mouse clicks
- Watch I/O being accelerated!
No zoning changes, no storage changes, no host-side changes. Plug-and-play. It’s that easy!