There are a variety of ways to extend Fibre
Channel or IP-based SANs over existing MANs and WANs,
including, just to name a few:
* Fibre Channel over ATM/SONET
* Fibre Channel over Ethernet (and then alternatively
over SONET) = FCIP
* SCSI over IP (iSCSI) over Ethernet
* Fibre Channel over SONET (using GFP or a proprietary
technologies)
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 synchs 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. High
bandwidth and high latency...this is where Anue excels!
With Anue Network Emulators, you can simulate a live
SAN extension solution in a lab environment. It doesn’t
matter if you’re emulating Fibre Channel, Gigabit Ethernet
or SONET/SDH...Anue can do it all on one hardware platform!
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