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Media 100 Legacy Compatible Peripherals Guide

ATTO AccelWare is an easy to use Macintosh-based SAN volume management software. This

user-friendly software helps project teams manage read/write access of shared volumes and avoid

the time-consuming and costly problems associated with undesirable write-overs, data corruption,

and team confusion. Users in a SAN environment can simultaneously access the same volume and

read the ﬁles they need, while only one team member has the privilege of writing to that volume.

This ﬁle management works at the volume level. You can select each volume as read/ write, read

only or read/write exclusive. This gives you the ability to share ﬁles quickly, change access

privileges easily, and have exclusive rights to a volume when digitizing or mastering to tape, if

needed. There are some inherent issues with Fibre Channel. One issue is the LIP (loop

initialization protocol). Unlike SCSI, which has preset SCSI IDs, the Fibre channel arbitrated loop

needs to poll the network and assign an ID to each device. Each time a system is added or reboots

there may be a slight stutter in your video playback. A hardware switch should eliminate this

problem. Another inherent FC issue is that the bandwidth is shared. Therefore, if all systems were

accessing the loop at the same time, the 100MB/sec bandwidth would be divided among them.

Equipment used

■ 2 Blue & White G3/400

■ 1 Beige G3/266

■ 1 Beige G3/233

■ ATTO FibreBridge™ - Intelligent Fibre channel to SCSI bridge

■ ATTO FibreCenter™ - Intelligent 5 port Fibre Channel Hub

■ ATTO Express PCI FC – Fibre Channel Host Bus Adapters

■ 2- four drive FC disk arrays

■ Ancor MKII-8 Fibre Channel switch

Tests

Conﬁguration 1 – 4 xs systems

Each system had read/write access to their own volume consisting of two drives striped. We played

back a 300KB program on system 1, while a second system digitized footage at 300KB. The third

system was editing and the fourth rendering. This conﬁguration worked well with no dropped

frames. When more than one system is accessing the same drives, you could see dropped frames.

Conﬁguration 2 – 2 xr systems

The throughput demands of xr require 4 drives striped as an array. Each 4 bay array was dedicated

to a system. You can import from the second array or swap privileges to access the other volumes.

Conﬁguration 3 – 1 xr system and 2 xs systems

The xr system requires a four-drive array and the 2 xs systems split the other 4-drive array striped

in pairs. The xr system can be dedicated to editing and mastering to tape, while the xs systems can

be for digitizing and rendering.

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