----- Original Message ----- From: "Al Boldi" <a1426z@xxxxxxxxx> To: "JaniD++" <djani22@xxxxxxxxxxxxx> Cc: <linux-raid@xxxxxxxxxxxxxxx> Sent: Monday, December 19, 2005 12:16 PM Subject: Re: RAID0 performance question > JaniD++ wrote: > > For me, the performance bottleneck is cleanly about RAID0 layer used > > exactly as "concentrator" to join the 4x2TB to 1x8TB. > > Did you try running RAID0 over nbd directly and found it to be faster? Now i trying the NBD + RAID0 without the middle layer raid1. I wondering, the speed is much more better! If i use dd in the raid0 and the raid1 layer is active, the traffic is 350-400Mbit/s If i use dd in the raid0 and the raid1 layer is inactive, the traffic is 512-620Mbit/s! If i use parallel dd on all NBD devices, the traffic is 650-720Mbit/s. (on my system's current minimal load) I found it very interesting! The kernel never reports timing information about raids in /sys/block/mdX/stat files! I cannot understand... Cheers, Janos - 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
