I'm using a QNAP-439 Pro II SAN. Full disk encryption is currently enabled. But since you take a 80% performance hit by enabling encryption I'm thinking about disabling encryption on the SAN and offloading it to Windows Server 2008 R2 Machine that I'm currently building anyway.
The SAN is operating on 4x2TB disks in RAID6 mode. Unless I'm mistaken (which is why I'm asking here), a RAID drive failure on the QNAP should be handled transparently to the Windows iSCSI client and should not interfere with Truecrypt right?