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Anue Enterprise Storage Solutions
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TESTIMONIAL
“The Anue Simulator has proved itself in supporting our audio and video streaming test methodology based on introducing elements of signal corruption.”
—Luca Rea (FUB) &
Ellio Binnella (ISCOM)
SAN Extension
Keeping It All In Sync
Information is the life-blood of business and a Storage Area Networks (SAN) can assure high-availability and redundancy to keep information flowing.
- Introduce delay of up to several seconds, depending on the line rate
- Generate impairments, including bit errors, frame/packet loss and total signal loss
- Operate at full line rate, regardless of packet size or data rate
- Manage with an intuitive GUI and plug-and-play setup
SAN technologies provide high-bandwidth, low-latency movement of block data from servers to disk arrays or tape drives. SAN extension connects SANs over wide-area networks for remote data mirroring, backup and file sharing. The application requires an affordable, high-performance method of interconnecting multiple SAN islands over distance that will functions within the existing datacom/telecom infrastructure.
SAN extension solutions use a variety of methods to extend Fibre Channel or IP-based SANs over existing MANs and WANs, including:
- Fibre Channel over ATM/SONET Fibre Channel over Ethernet (FCIP, FCoE)FCIP over SONETSCSI over IP (iSCSI) over Ethernet
- Fibre Channel over SONET (using GFP or a proprietary technologies)
The Anue Fibre Channel WAN Emulator has high bandwidth and high latency capibilities required for SAN extension testing. |
In a mirrored SAN extension environment, the data mirroring process continuously copies data from primary storage to a remote storage device. With synchronous mirroring, data isn't written to primary storage until remote storage confirms it has received the mirrored data. This process syncs primary and secondary storage but also introduces latency because of the checking process. (With asynchronous mirroring, the primary device does not wait for confirmation, which could result in a data mismatch in the event of a network failure).
In addition to latency, remote synchronous disk mirroring involves very large volumes of data being transferred between sites. This means that the MAN or WAN needs to perform to the same level as an in-building SAN.
Whether you are developing or implementing a SAN extension solution, you must validate that it delivers the required throughput and maintains data integrity in the presence of significant latency.