On 03/21/11 9:11 PM, Emmanuel Noobadmin wrote: >> You'll have really poor >> performance if you raid over iscsi... > I've spent more time thinking about this and reading over my > research.The crux here seems to be that while RAID does impose > additional write IOPS costs, it may be more than offset by the read > advantage. According to my own notes (which I overlooked in my first > reply), the increased performance from scaling was part of the > original reason I was thinking of using RAID on top of iSCSI. > > Searching more on this, the consensus seems to be that RAID 1/10 on > iSCSI is quite okay and may provide read performance increase but RAID > 5's iops penalty will probably be a killer. if you can use 2 dedicated ethernet adapters to 2 iSCSI servers for this mirror, its probably a win.