Raid 1 versus Raid 5 performance

Raid 1 compared to raid 5 with increasing drive count. This is representative of  the general performance of raid 1 versus raid 5. With a raid 1 and a raid 5 on the same controller, this is still representative. Setting up a server with a raid 1 and raid 5 provides a much greater safety factor than raid 5 alone. This is not representative of raid 10 compared to raid 5, raid 10 is much faster than raid 1.

 

Perc 5E, 128k cache, write back, PCI-E, Fujitsu MAX3036rc 15k drives SAS 36 Gig drives.  IOmeter score, in IOPs.

Single drive           272

Raid 1   2 drive     429

Raid 5   3 drive     468       9.2 %  faster than raid 1

Raid 5   4 drive     519       20 %

Raid 5   6 drive     649       51 %

Raid 5   8 drive     758       76%

As a note, SAS drives increase in throughput with more than 5-6 drives unlike u320 SCSI

 

Perc 4   (Lsilogic u320-2x) PCI-X, 128k cache, write back, Maxtor Atlas 15k drives SCSI 18 Gig

Raid 1   2  drive     428 

Raid 5   3  drive     446   

Raid 5   4  drive     490    

Raid 5   6  drive     543     

 

http://tweakers.net/benchdb/test/87