Raid 5 speed issues

  • Thread starter Thread starter Jordan
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J

Jordan

I have purchased an addon eSATA II card wtih two ports and a box that has
two eSATA 5 port multipliers for a total of 10 disks. I am using Windows
2000 Disk Manager to setup two RAID 5 sets with 5 disks each and each have a
total of almost 2TB available.

I am doing some speed testing with various utilities and it seems that small
liniar and random reads have very poor performance (25 - 50% slower). It is
only when the utilities test larger files above 500 KB where I start seeing
higher performance than just putting a single disk on the controller rather
than the 5 disk stripe.

Is this normal for RAID 5 to have poor small data performance and only
slightly better large file performance?
 
I would advise that you look at purchasing a dedicated RAID 5 controller
card. Software is very slow as it adds extra load on the processor, memory
etc of the system

"Jordan" <none@here.com> wrote in message
news:OBcAAsxwIHA.3780@TK2MSFTNGP03.phx.gbl...
>I have purchased an addon eSATA II card wtih two ports and a box that has
>two eSATA 5 port multipliers for a total of 10 disks. I am using Windows
>2000 Disk Manager to setup two RAID 5 sets with 5 disks each and each have
>a total of almost 2TB available.
>
> I am doing some speed testing with various utilities and it seems that
> small liniar and random reads have very poor performance (25 - 50%
> slower). It is only when the utilities test larger files above 500 KB
> where I start seeing higher performance than just putting a single disk on
> the controller rather than the 5 disk stripe.
>
> Is this normal for RAID 5 to have poor small data performance and only
> slightly better large file performance?
>
>
 
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