sony-vaio-z-series team mailing list archive

["K. Posern" <quickhelp@xxxxxxxxx>]

Hello Golden-Punk ;)

Did you read the mailing starting this thread?
Speaking about:
"""
=== Before ===

~ # hdparm -tT /dev/mapper/isw_xxxxxxxxx_Volume0
"""

You are still "Before" ... Whenever you are seeing "/dev/mapper" you are
using dmraid (device-mapper raid).
-->
Joels point was:
To get more speed you should try to switch to mdadm.
--> then you will see /dev/mdXXX (e.g. /dev/md126 by default or if you
follow Joels instructions /dev/md0).

Knuth

---

On 12/03/2010 01:19 PM, Silverrocker wrote:
> 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
> 
> 
> 
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