I'm pretty new to benchmarking hard disks and I'm looking for some advice on interpreting the results of some basic tests.
The server is: - Dell PowerEdge R430 - 1 x Intel Xeon E5-2620 2.4GHz - 32 GB RAM - 4 x 600GB 10k SAS Seagate ST600MM0088 in RAID 10 - PERC H730P Raid Controller with 2GB cache in write back mode. The OS is Ubuntu 14.04, I'm using LVM and I have an ext4 volume for /, and an xfs volume for PGDATA. I ran some dd and bonnie++ tests and I'm a bit confused by the numbers. I ran 'bonnie++ -n0 -f' on the root volume. Here's a link to the bonnie test results https://www.dropbox.com/s/pwe2g5ht9fpjl2j/bonnie.today.html?dl=0 The vendor stats say sustained throughput of 215 to 108 MBps, so I guess I'd expect around 400-800 MBps read and 200-400 MBps write. In any case, I'm pretty confused as to why the read and write sequential speeds are almost identical. Does this look wrong? Thanks, Dave
