>This is almost certainly a result of forced IDE mode. With this you end up with a master/slave setup between the drives on each controller, and all of the other overhead of EIDE. Thank you for that. Normally, I would not pursue the issue further, as the server/filesystem is performing within 20%, on its most challenging workload, of what it can do with the workload running in a large tmpfs on the same machine. (I have lots of memory.) However, I'm now engaged in the issue sufficiently that I'll be contacting Dell tomorrow to ask them why we aren't getting what was advertised, and to see if they have any suggestions. So, would you expect the situation to change if there was some magic way to make AHCI active? I will briefly address the filesystems thing. I'm not running down XFS. If anything, I'm shaking the bushes to see if it prompts anyone to tell me something that I don't know about XFS which might change my assessment of when it might be appropriate for my customers' use. I wouldn't mind at all being able to expand use of XFS in appropriate situations, if only to get more experience with it. Beyond that, I'm not sure it would be constructive for you and me to continue that conversation. I've already posted my views, and repeating just gets... well... repetitive. ;-) -Steve -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
