[F7] Most reliable RAID level

Mogens Kjaer mk at crc.dk
Thu Jun 28 08:30:23 UTC 2007


Chris Tyler wrote:
...
>  If the disks are on separate controllers, you can
> read and write them in parallel, yielding good performance (1x write, Nx
> read).

Why is it that I don't see this for a RAID-1 system?

2xSATA 160G disks:

RAID 1:

Write 20G file: 52.5 MB/sec
Read 20G file: 63.6 MB/sec

RAID 0:

Write 20G file: 107 MB/sec
Read 20G file: 105 MB/sec

I would have expected the number 63.6 MB/sec to be
higher.

Mogens

-- 
Mogens Kjaer, Carlsberg A/S, Computer Department
Gamle Carlsberg Vej 10, DK-2500 Valby, Denmark
Phone: +45 33 27 53 25, Fax: +45 33 27 47 08
Email: mk at crc.dk Homepage: http://www.crc.dk




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