RAID-1 vs RAID-5 Part 7

out-cache results - Random IO – 8 kbytes – 2x32 Gbytes


SE3510 - Scalability analysis



This analysis is showing us the impact of concurrency on IOPS performance as well as scalability differences between RAID-1 and RAID-5. Please find below the SE3510 results and charts on test R1 to R5 :


se3510_outcache 1

se3510outcache 2



Observations : RAID-5 is in average 9% slower in read-only up to 33% in 50% read and 61% in a write-only situation. Scalability is good in all cases. The RAID-5 vs RAID-1 difference is stable in percentage for every IO pattern tested however the IOPS difference is proportional to the concurrency. For example, at 50% read , a difference of 2123 IOPS is observed between RAID-1 and RAID-5 at 64 threads, however this difference is only 1024 IOPS at 16 threads. If IO is one of the critical component of the architecture performance, you may already change the end-user experience if you are choosing RAID-5 vs RAID-1.A performance note : RAID-1 andom write raw performance at almost 10000 IOPS is outstanding.





Comments:

i know raid-1.A performance.

Posted by Egitim on December 10, 2010 at 12:22 AM PST #

How many drive were used during the test?

Posted by Bob on March 11, 2011 at 08:15 AM PST #

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