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Disk Response Time

IOMeter is sending a stream of requests to read and write 512-byte data blocks with a request queue depth of 1 for 10 minutes. The results are sorted by the write response.

While the read response seems to be the same for every array type, there is a logical trend at writing. The RAID5 arrays have the highest response at writing and it almost doesn’t depend on the number of disks in the array. This must be due to the sophisticated algorithm for checksum processing. It is performed by the XOR-processor and takes about the same time for any number of disks. The rest of the results are similar to the Random Write test: the RAID1 is slower than the single disk which is outperformed by the RAID10. The RAID0 arrays are in the lead.

 
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