sony-vaio-z-series team mailing list archive

[Silverrocker <silverrocker@xxxxxxxxx>]

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:


[silverrocker@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
[silverrocker@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
[silverrocker@Freya ~]$ sudo hdparm -Tt /dev/sd
sda  sdb  sdc  sdd
[silverrocker@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
[silverrocker@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
[silverrocker@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
[silverrocker@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