If you are looking for an affordable SAN storage which allows you to get best performance and different fabric modules you should have a look at RisingTide Systems.
RTS offers SAN storage based in LIO (www.linux-iscsi.org). The target and most fabric modules are upstream in the Linux kernel now. There are modules for iSCSI, Fibre Channel, FCoE and Infiniband (SRP) available. The system is managed by a CLI tool called RTSadmin.
LIO offers support for different backends like block level devices, filesystems, RAM-disks or plain SCSI devices. If you have enough money you can also use a flash card from FusionIO to get a ultra high speed storage server. A prototype was demonstrated last year at Interop.
Future versions will fully integrate with DRBD and the new thin provisioning target for device mapper. With these features you will get many enterprise storage features.
RTS offers also an iSCSI initiator which allows multiple TCP connections within a iSCSI session. This allows an efficient multipathing and loadbalancing. The default initiator of Linux does not support multipathing on iSCSI level. The Windows iSCSI initiator supports this features too.
The latest version of the RTS target also support the VAAI extensions for VMware.
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