So, given the fact that you can only get hard drives of about 160GB now for the cheapest price, I find i have a ton of extra drive space on workstations spread throughout my office. I'd like to utilize this space as a redundant RAID-like array of some sort for low-priority files and backups.
I have about 100 workstations that need only 40GB of disk space to operate, which leaves about 120GB of spare space which i have partitioned off. I'm wondering if there is some way to use iSCSI or similar to mount those partitions in some kind of RAID-like array. I mean, that's something like 12.5TB of disk storage at my disposal which won't be used by the workstations (they're locked down and don't allow users to fiddle with it).
Also, the workstations are always on, so that's not an issue, but the system should be tolerant of occasional downtime due to reboots for various reasons (Windows, you know).
Are there any off-the-shelf solutions for this? What about open source? I'd rather not roll my own if I don't have to.
My server environment is ESX 3.5 with mostly Windows hosts. SQL Server, etc... workstations are all Windows.