I am using HP StorageWorks (formerly known as LeftHand) P4000 Virtual SAN Appliance (VSA) for my iSCSI storage. It is a virtual machine that uses any storage (in my case local disks) and presents it as iSCSI targets. It is enterprise level software (as opposed to OpenFiler) with such features as high availability (network RAID), thin provisioning, snapshots, replication and Site Recovery Manager plugin. The list price is 4500 EUR, but the good thing is that it can be used for free without the advanced features such are replication, snapshots, HA, etc. Those features can be used in trial mode for 60 days which is perfect for Site Recovery Manager testing. HP also sells hardware equivalents of P4000 which are basically regular computers with SAN appliance software.
The SAN appliance software is called SAN/IQ and new update version 9 was released last week. For me the most interesting new feature is vStorage API for Array Integration (VAAI). Now in vSphere ESX4.1 there are some storage related operations offload from the vmkernel to the storage processor. One of them is zeroing newly created thick disk (eager zero thick disk) needed for fault tolerance VMs. To test if VAAI works I compared creation of 10GB FT enabled disk. Without VAAI the disk was created in 249 seconds with VAAI it took only 193 seconds without any ESX host CPU overhead or unnecessary SAN traffic.
Here is the screenshot of a datastore with hardware acceleration.
I love when you can play with enterprise technology at home.
The HP VSA can be downloaded here: www.hp.com/go/tryvsa