NIMBLE STORAGE
CASL ARCHITECTURE
Nimble Storage solutions are built on its patented Cache Accelerated Sequential Layout (CASL™) architecture. CASL leverages the unique properties of flash and disk to deliver high performance and capacity – all within a dramatically small footprint.

CASL and InfoSight™ form the foundation of the Adaptive Flash platform, which allows for the dynamic and intelligent deployment of storage resources to meet the growing demands of business-critical applications.

Key Innovations from CASL
Write-Optimized Data Layout:
CASL collects or coalesces random writes to the array, compresses and writes them sequentially to disks. This results in write operations that are as much as 100x faster than traditional disk-based storage.
Inline Compression
CASL compresses data as it is written to the array with no performance impact. It takes advantage of efficient variable block compression and multicore processors. A recent measurement of our install base shows average compression rates from 30 to 75 percent for a variety of workloads.
Scale-to-Fit Flexibility
CASL allows for the non-disruptive and independent scaling of performance and capacity. This is accomplished by either upgrading the storage controller (compute) for higher throughput, moving to larger flash SSD (cache) to accommodate more active data, or by adding storage shelves to boost capacity. This flexible scaling eliminates the need for disruptive forklift upgrades.
Snapshots and Integrated Data Protection
CASL can take thousands of point-in-time instant snapshots of volumes by creating a copy of the volumes' indices. Any updates to existing data or new data written to a volume are redirected to free space (optimized by CASL's unique data layout). This means there is no performance impact of snapshots and snapshots take little incremental space as only changes are maintained. This also simplifies restoring snapshots as no data needs to be copied.
Efficient Replication
Nimble Storage efficiently replicates data to another array by transferring compressed, block-level changes only. These remote copies can be made active if the primary array becomes unavailable. This makes deploying disaster data recovery easy and affordable – especially over a WAN to a remote array where bandwidth is limited.
Zero-Copy Clones
Nimble Storage arrays can create snapshot-based read/writable clones of existing volumes instantly. These clones benefit from the fast read and write performance, making them ideal for demanding applications such as VDI or test/development.
VIDEO OVERVIEW
Nimble Storage CASL Architecture Technical Deep Dive
Storage Architect Devin Hamilton provides a technical deep divr into Nimble's Cache Accelerated Sequential Layout (CASL)architecture