[CentOS] using CentOS as an iSCSI server?

> Say, I had 4 devices with 500 GB drives exported using iSCSI.  If a
> single larger server
> took those four iSCSI export drives, and created one md RAID 5 device,
> could a single
> server be turned off, and just degrade the array until it was either
> replaced entirely
> or brought back online?
>   


how long would it take to replicate and rebuild a volume  across the LAN 
via iscsi?  if each of those slices was 500GB, you'd be reading 3 x 
500GB and writing 500GB before the drive was resynched.   note, a single 
drive on each storage controller in this scenario won't even achieve 
1gigE speeds.