Re: [Xen-users] Getting better Disk IO

[Goswin von Brederlow <brederlo@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

"James Rivera" <jrivera@xxxxxxxxxxx> writes:

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> namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PlaceName"/>
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> I am trying to improve my disk io.  I am running xen 3 on fedora 6.  Using HD
> tachh to get my average read time.  So far average read is 6.6 mb /s Is there
> any settings I can change to get better performance? Do I need to tweak Qeum? 
> How can I check if I have the right drivers for the raid? I am using Adaptec. 
> I hope someone can help me.:p>
>
> :p> 
>
> Thanks James:p>
>
> :p> 
>
> In Domain-0 I run hdpram -tT /dev/sda1:p>
>
> dev/sda1:
>  Timing cached reads:   11716 MB in  1.99 seconds = 5873.27 MB/sec
>  Timing buffered disk reads:  100 MB in  1.84 seconds =  54.30 MB/sec

Hdparm is hardly conclusive. The reported values varry a lot between
systems for no aparent reason.

Try running /usr/sbin/bonnie in dom0 and domU.

      NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) MAXMEM(%) 
VCPUS NETS NETTX(k) NETRX(k) VBDS   VBD_OO   VBD_RD   VBD_WR SSID
  build-64 --b---        104    0.0     522780   26.6     524288      26.7     
2    1       63      409    1        0   163499   468742    0
  Domain-0 -----r       1637    2.4     619728   31.5   no limit       n/a     
2    4   221074   113999    0        0        0        0    0


Version  1.03       ------Sequential Output------ --Sequential Input- --Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
dom0             2G 23579  43 19425   5 10316   0 26105  22 26975   0 100.5   0
domU blk         2G 22999  41 23819   5 10610   0 23674  17 24711   0 103.3   0
domU nfs         2G 18732  31 19010   2  4851   0 10855  14  5581   0  77.5   0

Looks like nfs is a real slowdown. :) Surprise, surprise.

MfG
        Goswin

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