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SAN Solutions

The hub was used to segment our network into two loops, dividing the bandwidth equally between

the workstations. Two machines shared one loop through the hub. Each loop has a maximum

transfer rate of 100MB/sec. So, theoretically, each machine had 50MB/sec available to it. In this

conﬁguration, the two machines sharing a loop will be affected by L.I.P. (loop initialization

protocol) if one of them boots up or has to restart. This LIP can cause communication errors while

the other is working in Media 100. A hardware switch eliminates this problem; essentially

isolating each system to its own loop.

The drives in our test were striped into four 2-drive arrays. To achieve optimal performance in this

conﬁguration, each system had access to its own 2-drive array. Access privileges can be traded or

shared to have access to the same media. If more drives are striped together or lower data rates can

be used then multiple systems can access the same data at the same time. However, dropped

frames are a possibility in this scenario.

When digitizing or mastering to tape, a user should have exclusive access to the disk arrays where

the media for the program resides.

FibreShare is a reliable, easy-to-use storage area networking (SAN) software package for both

Macintosh and Windows NT computers. FibreShare can be conﬁgured to work in a homogeneous

Mac-to-Mac network, a homogeneous Windows-to-Windows network, or in a heterogeneous Mac-

to-Windows NT network. At this time, only the Mac-to-Mac network was tested.

FibreShare allows you to set up a SAN using either single disk volumes or multi-disk arrays.

FibreShare is simple to use and does not require a dedicated server. An administrator ﬁrst sets up

storage depending upon his needs, and then creates a network of individual users and groups. The

administrator then assigns the users and groups certain access privileges to the volumes in the

FibreShare network. Users and groups can be given read-only access, shared read / write access or

exclusive access to any given volume. When users log into the FibreShare network, they can only

see the storage that they have been assigned to, and can only mount this storage with a privilege

level assigned by the administrator. Once the volume is mounted, it appears as local storage.

FibreShare provides users with an efﬁcient way to collaborate on a variety of projects, taking

advantage of the speed found in ﬁbre channel networking. FibreShare eliminates the need for the

traditional “sneaker-net” method of transferring ﬁles, or the equally lethargic Ethernet-based

model of ﬁle transfers.

ATTO AccelWare and Media 100

The Media 100 Peripheral Testing group, in conjunction with ATTO technology, has completed a

series of Storage Area Networking tests using the ATTO AccelWare solution. We were successful

in identifying a few conﬁgurations that work well.

The ATTO AccelWare solution is intended for small groups of systems that want the ability to

share their volumes at speeds consistent with your own local storage. You should determine

whether or not these conﬁgurations would work for your environment by looking at your current

workﬂow and bottlenecks. It is important that the SAN Provider is willing to install, support, and

also educate you on the limitations so that realistic expectations are set. Media 100 supports the

conﬁgurations listed within this guide, but will not directly support a SAN solution.

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