[Bioclusters] 3ware 7850 RAID 5 performance

[Ivo Grosse]

Hi Joe,

thanks for your helpful comments.


Joseph Landman <landman@scalableinformatics.com> wrote on Mon, 26 Aug =

2002:

>   I went to the 3ware site and couldnt find the 7850.  I did find the
> 7500-8.  Is this the card?  =


Yes.  3ware changed their naming scheme.


> I am looking at
> http://www.3ware.com/products/pdf/7500SelectionGuide7-26.pdf .  =


I think 3ware states 180 MB/s for reads and 127 MB/s for writes.  (I =

think it is MB/s and not Mb/s).

Does anyone have a RAID-5 array that gets close to that performance?


>   RAID on these systems are going to be limited to the speed of the
> slowest disk.  =


In our case all disks are identical, Maxtor IDE 80 GB 7200 rpm, and we =

see a r/w speed of > 25 MB/s per disk.


Ivo