On 7/23/2012 7:42 AM, Shaffin Bhanji wrote: > Thank you Stan! > >> Just imagine what it would do if you started from scratch with 20 of the >> Black drives in md/RAID6 w/a 32K chunk, and XFS tuned to the stripe. >> You'd easily hit 1GB/s streaming reads, with streaming writes probably >>> 500MB/s. Depends on your CPU. I forgot which one is in the Asus board. > > Now this is the system I want to put together 1GB/s streaming reads, > and 500MB/s writes - please recommend the hardware for me to the tee > as I dont want to go wrong anywhere :-)
That's not what you want. Don't confuse peak sequential throughput with random throughput. Your workload is almost entirely random IO. The configuration I describe above is absolutely unsuitable for a random IO workload. Ramon's primary application is video streaming, and his secondary is moving/copying large video files. These are purely sequential workloads. The above system is suitable for his needs, not yours. Your primary workload is serving virtual machine disk files as iSCSI LUNs, and Samba shares. This workload is dominated by random, not sequential, IO. The system I spec'd for you is more than 5x superior to the one above for your workload. As a bonus, 8 drives suck less power than 20 drives, and it's a 2U instead of 4U system. Don't be fooled by big sequential numbers. The vast majority of all workloads are random in nature, not sequential. So build your systems for fast random IO, especially random writes. Which is exactly what I gave you. The big sequential system above will be pretty horrible with a random IO workload such as yours. -- Stan -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/500dfa07.5010...@hardwarefreak.com
