On Oct 21, 2009, at 11:43 AM, John R Pierce <pierce at hogranch.com> wrote: > >> 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. Worthy of testing just to see how it performs, but I definitely would stick with raid6 or 10 here. -Ross