Q G Making Storage Real-time Steve Modica, CTO, Small Tree

Q G Topics to Cover  Who is Small Tree  What is real-time  What is Future Proof? Twin Cities Public Television Quality Workshop

Q G Small Tree  Started in 2003  Ex-SGI and Cray engineers  Stuff we do Drivers for Networking and Storage Army Work Storage and Switch Profiling and Configuration Twin Cities Public Television Quality Workshop

Q G Realtime  Hard Real-Time the completion of an operation after its deadline is considered useless  Soft Real-Time will tolerate such lateness, and may respond with decreased service quality (e.g., omitting frames while displaying a video). (sourced from Wikipedia) Twin Cities Public Television Quality Workshop

Q G Step by Step to Real-time  Define the load Bandwidth Timing  Measure the load Simulation Tools Measurement Tools Twin Cities Public Television Quality Workshop

Q G RAID Controller Issues  Firmware  Driver revs  Interleave  Read ahead  Other features Twin Cities Public Television Quality Workshop

Q G System Issues  Bus speed  Memory  Kernel Resources Twin Cities Public Television Quality Workshop

Q G Network Issues  Flow Control  Switch performance  Driver tuning  IO Balancing Disk vs. Network Client distribution Twin Cities Public Television Quality Workshop

Q G Client Issues  Which platform to choose?  Workload requirements  Tuning  Built in Ports vs. Small Tree ports Twin Cities Public Television Quality Workshop

Q G Future Proof What does that mean?

Q G Twin Cities Public Television Quality Workshop InteroperabilityPerformanceSupport Another Iron Triangle

Q G Benefits of Simple NAS set ups  Very easy to understand  Based on Heterogeneous Protocols  Scale well with Ethernet  Easily maximize connected clients Twin Cities Public Television Quality Workshop