Re: windows software raid 0 volume extremely slow

From: Carey Frisch [MVP] (cnfrisch_at_nospamgmail.com)
Date: 11/29/04

  • Next message: Rob T: "16 bit windows Subsystem Error" 
    Date: Sun, 28 Nov 2004 17:05:59 -0600

    How is your question even remotely related to Windows Security
    issues? Please visit the appropriate Windows XP Hardware newsgroup:
    news://msnews.microsoft.com/microsoft.public.windowsxp.hardware

    Mission accomplished! 

    -- 
Carey Frisch
Microsoft MVP
Windows XP - Shell/User
Be Smart!  Protect Your PC!
http://www.microsoft.com/athome/security/protect/default.aspx
------------------------------------------------------------------------------------
"George W. Bush" wrote:
| i have two identical 120 Gb HDDs. each is connected as master to a separate 
| ide channel. among other ide devices is only a cd rom drive connected as 
| slave to secondary channel. but i almost never actually use it so it shouldnt 
| be affecting the issue with the HDDs. 
| 
| both of them are set up as dynamic disks. each has a simple volume on it and 
| a 100Gb chunk that is a part of a striped volume set up across these two 
| disks (using 1 such chunk on each of the drives). so far so good. this 
| configuration i suppose is acceptable according to windows help instructions.
| 
| right after installing windows i measured performance of all of the three 
| volumes. i used winbench99 and transfer speeds were pretty close to what one 
| would expect from such a seemingly nice configuration. simple volume showed 
| about 56MB/s which is just 2MB/s below technical specifications for this 
| model. striped volume showed 82 MB/s speed.
| 
| but here's what i get in real life from these disks. copying/moving from 
| simple to simple volume gives me speed of about 23MB/s which is far from 56 
| in the test but ok i can live with it. what's most outrageous is the speed of 
| the striped volume. all copying/moving operations involving this volume are 
| at speed of approximately 1.5MB/s. what kind of fast volume is it? in fact 
| its the bottleneck in my system right now- - i can't even watch a divx movie 
| from it without getting the slideshow effect if i simultaneously say copy 
| something onto this volume or process some file on it or do smth like that. 
| copying a 700Mb movie from/onto it takes up to 10 min. this IS ridiculous.
| 
| i have measured the performance of these disks again thru winbench right now 
| it still shows the same good speeds of 56 and 82 MB/s respectively. what is 
| it  - windows using the available bandwidth incorrectly/ineffectively or what?
| 
| and it's not a problem of these specific drives. before them i had two other 
| drives and pretty much the same sort of configuration and had exactly the 
| same situation with them: perfect results in winbech (exactly up to 
| expectations) and on the other hand lousiest performance (1.5MB/s for raid 0) 
| with real tasks.
| 
| i really need to figure out what is wrong here cos i'm planning to upgrade 
| to 3x200Gb disks and right now i dont have the slightest inclination to use 
| the "magical" software raid 0 again.
| 
| system config: msi 6378 v.3 (via kle133 w/int. vga), athlon XP 2400+, 512 
| RAM, winxp
  • Next message: Rob T: "16 bit windows Subsystem Error"

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