Hi newgroup I have a question about my fakeraid setup and how come it's not as fast as it should be. I'm on a Z13 with 4 sdd's (each 64GB sized, totaling 256GB).
I ran hdparm -Tt on the dmraid and aswell as on the single drivers with the following output: [silverroc...@freya ~]$ sudo hdparm -Tt /dev/mapper/isw_didhdcbhd_Volume0 /dev/mapper/isw_didhdcbhd_Volume0: Timing cached reads: 10240 MB in 2.00 seconds = 5123.22 MB/sec Timing buffered disk reads: 550 MB in 3.01 seconds = 183.00 MB/sec [silverroc...@freya ~]$ sudo hdparm -Tt /dev/mapper/isw_didhdcbhd_Volume0 /dev/mapper/isw_didhdcbhd_Volume0: Timing cached reads: 9370 MB in 2.00 seconds = 4687.60 MB/sec Timing buffered disk reads: 672 MB in 3.00 seconds = 223.99 MB/sec [silverroc...@freya ~]$ sudo hdparm -Tt /dev/sd sda sdb sdc sdd [silverroc...@freya ~]$ sudo hdparm -Tt /dev/sda /dev/sda: Timing cached reads: 9960 MB in 2.00 seconds = 4982.34 MB/sec Timing buffered disk reads: 436 MB in 3.01 seconds = 144.95 MB/sec [silverroc...@freya ~]$ sudo hdparm -Tt /dev/sdb /dev/sdb: Timing cached reads: 9562 MB in 2.00 seconds = 4783.64 MB/sec Timing buffered disk reads: 438 MB in 3.00 seconds = 145.91 MB/sec [silverroc...@freya ~]$ sudo hdparm -Tt /dev/sdc /dev/sdc: Timing cached reads: 9992 MB in 2.00 seconds = 4998.56 MB/sec Timing buffered disk reads: 434 MB in 3.01 seconds = 144.42 MB/sec [silverroc...@freya ~]$ sudo hdparm -Tt /dev/sdd /dev/sdd: Timing cached reads: 9822 MB in 2.00 seconds = 4913.14 MB/sec Timing buffered disk reads: 436 MB in 3.01 seconds = 144.86 MB/sec I'm running archlinux with the lts kernel (3.6.32) greets Silverrocker
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