About QOS on the K2 SAN

Grass Valley designs your system using Quality of Server (QOS) features for different categories of client Input/Output (I/O) traffic, as follows:

• Real Time Input Output (RTIO) — Clients supporting record/play operations are guaranteed I/Os with first priority.
• Non-Realtime Input Output — Clients that are not real-time, such as FTP servers, share an I/O pool that is separate from the real-time I/Os. The non-realtime clients can also temporarily use real-time I/Os when those I/Os are not being used by real-time clients.
• Reserved Input Output (RVIO) — Clients that have specific I/Os requirements are each assigned their own portion of the I/O pool. This guarantees the client has the I/Os it requires and also prevents the client from exceeding its designed amount. These I/Os are reserved only while the client is powered up. If the client is shutdown, the client's reserved I/Os become available in the I/O pool for use by other clients.

The exact QOS values for your K2 SAN are calculated by Grass Valley to meet your workflow requirements. When you operate your K2 SAN within the bounds of those requirements you should have no bandwidth problems, even during peak bandwidth events. If your workflow requirements change, allow Grass Valley to re-calculate your QOS values. Some versions of K2 software have a RVIO calculator in the K2Config application. Do not use the RVIO calculator to change your RVIO value. The calculator is intended for use by qualified Grass Valley personnel only. Do not attempt to change any QOS values without guidance from Grass Valley. Doing so can result in unexpected performance problems.